Correct installation method of PP magnetic drive pump

The plastic magnetic drive pump is widely used in petroleum, chemical, pharmaceutical, electroplating, environmental protection, water treatment and other enterprises to pump flammable, explosive, toxic and precious liquids due to its fully sealed, leak-free, and corrosion-resistant characteristics. The ideal pump for civilized workshops and factories without leakage and pollution.

The following items should be considered during the installation of the plastic magnetic drive pump:

1. Put the unit on the foundation, put a pair of wedge pads between the bottom plate and the foundation, and adjust the wedge pad to correct the level of the pump. After adjustment, tighten the anchor bolts.

2. The pump and motor should be checked before installation. All parts should be intact and there should be no debris in the magnetic pump.

3. Make a concrete foundation according to the size of the foundation, and bury the anchor bolts at the same time.

4. The suction and discharge pipelines of the magnetic pump should be supported by a magnetic pump. The diameter of the inlet and outlet pipelines should be the same as that of the pump inlet and outlet.

5. After the installation is completed, finally turn the magnetic drive pump coupling by hand to check whether there is any rubbing phenomenon. The installation is complete if the rotation is easy and even.

6. Magnetic drive pumps are strictly prohibited from pumping media with particles and easy to crystallize, and continuous operation with the discharge port closed is not allowed, and the minimum flow must be maintained.

7. In order to prevent debris from entering the magnetic drive pump, a filter should be installed at the inlet, and the filtering area should be 3 to 4 times larger than the cross-sectional area of the pipeline.

8. When the medium viscosity is too high, the performance and power of the magnetic drive pump will change. For details, please follow the instructions.

9. It must be ensured that the installation height of the magnetic drive pump conforms to the cavitation margin of the pump, and the pipeline loss and medium temperature must be considered.

Matters needing attention in the use of plastic magnetic drive pump

Matters needing attention in the use of plastic magnetic drive pump

The drive device of the plastic magnetic pump adopts an active magnet coupling to be directly mounted on the motor shaft, the pump chamber is completely enclosed, and the impeller with a magnet on the pump shaft is indirectly driven to rotate through magnetic coupling. The structure is compact, safe and energy-saving. Although the sturdy and durable pump body structure of the plastic magnetic pump is plastic, the plastic magnetic pump housing is made of metal material, so the pump body can bear the weight of the pipeline and withstand mechanical impact.

The following are common items to be noted during use:

1. Because the cooling and lubrication of the plastic magnetic pump bearings rely on the conveyed medium, dry running is prohibited, and at the same time, no-load running caused by restarting after a power cut in the middle of work is avoided.

2. If the conveyed medium contains solid particles, a filter should be added to the entrance of the plastic magnetic pump: if it contains ferromagnetic particles, a magnetic filter should be added.

3. The ambient temperature of the plastic magnetic pump in use should be less than 40℃, and the temperature rise of the motor should not exceed 75℃.

4. The medium sent by the elm should be within the allowable range of the plastic magnetic pump material. The operating temperature of the plastic magnetic pump cannot be lower than minus 30℃ and the highest temperature cannot exceed 100℃. Transport the liquid without hard particles and fibers with suction pressure not greater than 0.2MPa, maximum working force 1.6MPa, density not greater than 1600Kg/m3, viscosity not greater than 30X10-6m㎡/s.

5. For the medium that is easy to deposit and build up, the conveying liquid should be cleaned in time after use to drain the liquid accumulation in the plastic magnetic pump.

6. After 1000 hours of normal operation of the plastic magnetic pump, the wear condition of the bearing and end face moving ring should be disassembled, and the wearing parts that are not suitable for reuse should be replaced.

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Correct use of plastic magnetic drive pump

Correct use of plastic magnetic drive pump

1. Start and run

(1) Clean up the debris surrounding the equipment that affects the safety of the equipment and operators.

(2) Before driving, fill the pump with the liquid to be delivered (if the pump is sucking up), open the inlet valve, close the outlet gate valve, and connect the power supply.

(3) Turn on the power supply and check whether the rotation direction of the pump is correct.

(4) Several sets of trial run for 3-6 minutes, such as five abnormal phenomena can be put into operation.

(5) When driving for the first time after a long-term shutdown or pump overhaul, remove the fan cover of the motor and crank manually to check whether the fluoroplastic magnetic pump rotates flexibly. Install the fan cover after confirming that there is no problem.

2. Normal parking

The gate valve of the outlet should be closed first, and then the power supply should be cut off.

3. Emergency stop

Stop the motor immediately, and then close the outlet valve and inlet valve.

4. Repair and maintenance

(1) Regularly check the pump and motor, and replace vulnerable parts.

(2) When the pump is not in use for a long time, clean the flow passage in the pump and cut off the power supply.

(3) Dry operation is strictly prohibited.

5. Precautions during operation

(1) Pay attention to the pressure difference between the front and back of the filter on the suction side. When the pressure difference increases, it means that the filter is blocked by foreign matter. The pump must be stopped to clean the coarse filter.

(2) Whether the discharge volume and discharge pressure meet the specified values.

(3) Whether there is abnormal sound or vibration. If abnormal sound or vibration occurs, it generally indicates cavitation or excessive bearing wear.

(4) Whether the fluorine plastic magnetic pump has cavitation: Open the outlet valve of the pump. When the flow reaches a certain amount, it suddenly makes noise and vibration. At this time, continue to open the valve. If the flow still does not increase, it means that there is cavitation. When there is cavitation, perform exhaust operation. Note: The magnetic pump must not be operated in the cavitation state. If it continues to operate in this state, it will cause early bearing wear.

(5) Whether the current value of the motor exceeds the rated current.

(6) Whether the temperature of each part of the pump is abnormally overheated.

Plastic Magnetic Drive Pump — The material of pump body has four kinds to choose from, including PP(Polypropylene), GFRPP(Glass Fiber Filled Polypropylene), PVDF(Natural PVDF), CFRETFE(Carbon Fiber Filled ETFE). Correct choice of pump body material depends on acid / alkaline density of solution.

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Correct selection method of magnetic drive pump

Correct selection method of magnetic drive pump

1. Choose according to the physical and chemical properties of the conveying medium

The physical and chemical properties of the conveying medium directly affect the performance, material and structure of the pump, which is one of the important factors that need to be considered when selecting a model. The physical and chemical properties of the medium include: medium name, medium characteristics (such as corrosiveness, abrasiveness, toxicity, etc.), solid particle content and particle size, density, viscosity, vaporization pressure, etc. If necessary, the gas content in the medium should also be listed, indicating whether the medium is easy to crystallize, etc.

2. Choose according to process parameters

Process parameters are a particularly important basis for the selection of magnetic drive pumps, and should be carefully determined according to the process flow and operating range. For example, flow and head are one of the important process parameters for pump selection, which are directly related to the production capacity and conveying capacity of the entire device.

(1). Flow rate: Flow rate refers to the amount of medium required to be transported by the pump during the production of process equipment. The technician should give the normal minimum and maximum flow. Often only the normal flow and rated flow are given on the pump data sheet. When selecting a chemical magnetic pump, the rated flow must not be less than the maximum flow of the device, or 1.1~1.15 times the normal flow.

(2). Head: refers to the head value required by the process device, also known as the calculated head. Generally, the rated head of the pump is required to be 1.05~1.1 times the required head of the device.

(3). Inlet pressure and outlet pressure. Inlet and outlet pressure refer to the pressure at the inlet and outlet flanges of the pump. The size of the inlet and outlet pressure affects the pressure resistance requirements of the shell and shaft seal (isolation sleeve).

(4). Temperature: refers to the temperature of the inlet medium of the pump. Generally, the normal, minimum and maximum temperature values of the inlet medium of the magnetic pump should be given.

(5). Device NPSH NPSHa, also called effective NPSH.

(6). Operating status The operating status is divided into continuous operation and intermittent operation.

3. Choose according to the field conditions of the magnetic drive pump

Field conditions of magnetic drive pump include:

(1). Installation location (indoor, outdoor, plateau, seaside).

(2). Ambient temperature.

(3). Relative humidity.

(4). Atmospheric pressure.

(5) Atmospheric corrosion conditions.

(6). Classification of hazardous areas.

4. Choose according to the piping layout conditions of the system

The piping layout conditions of the system refer to some data such as the height, distance and direction of the conveyed liquid, the lowest liquid level on the suction side, the highest liquid level on the discharge side, etc., and the pipe specifications and their length, materials, pipe fitting specifications, quantity, etc., in order to carry out the system lift Calculation and verification of cavitation margin.

Five. Choose according to operating conditions

There are many operating conditions, such as saturated vapor pressure in the operation of the medium (liquid), suction side pressure (absolute), discharge side container pressure, altitude, ambient temperature, whether the operation is intermittent or continuous, and the position of the pump is fixed It’s still removable.

6. For pumps whose power is less than 10KW, the use of chemical magnetic pumps can ensure the effect.

Installation and use of stainless steel magnetic drive pump

Installation and use of stainless steel magnetic drive pump

SS magnetic drive pump is a new product that applies the working principle of permanent magnet coupling to the pump. It has reasonable design, advanced technology, full sealing, no leakage, and corrosion resistance. Its performance has reached the advanced level of similar foreign products.

Stainless steel magnetic pump installation and use

1. The stainless steel magnetic pump should be installed horizontally, not upright, and the pump body must not bear the weight of the pipeline. For occasions with special requirements for vertical installation, the motor must face upwards.

2. When the suction liquid level is higher than the pump axis line, just open the suction pipe valve before starting. If the suction liquid level is lower than the pump axis line, the pipeline needs to be equipped with a bottom valve.

3. The pump should be inspected before use. The motor fan blades should rotate flexibly, without jamming or abnormal noise, and all fasteners should be tightened.

4. Check whether the rotation direction of the motor is consistent with the steering mark of the stainless steel magnetic pump.

5. After the motor starts, slowly open the discharge valve. After the pump enters the normal working state, adjust the discharge valve to the required opening.

6. Before the pump stops working, first close the discharge valve, and then close the suction pipe valve.

Magnetic drive pump manufacturers and suppliers from China

SS magnetic drive pump — The stainless steel magnetic pump is fully sealed, has no leakage, is clean and environmentally friendly, runs quietly and has low vibration. It is the first choice for pumping flammable, explosive, corrosive and precious liquids. It saves a lot of cost for users because of energy saving, environmental protection, reliability and safety, and substitution of imports. It is widely used in the fields of chemical industry, alkali making, petroleum, medicine, hygiene, pesticide, paper making, dyestuff, sewage treatment and so on.

Precautions for the correct use of stainless steel magnetic drive pump

Precautions for stainless steel magnetic drive pump:

1. Stainless steel magnetic drive pump should prevent particles from entering

(1). Ferromagnetic impurities and particles are not allowed to enter the magnetic drive and bearing friction pairs.

(2). After conveying the medium that is easy to crystallize or precipitate, it should be washed in time to ensure the service life of the sliding bearing.

(3). When transporting media containing solid particles, filter at the inlet of the pump flow pipe.

2. Stainless steel magnetic pump should prevent demagnetization

(1). The magnetic torque cannot be designed too small.

(2). It should be operated under the specified temperature conditions, and the medium temperature is strictly prohibited. A platinum resistance temperature sensor can be installed on the outer surface of the magnetic pump isolation sleeve to detect the temperature rise in the annulus area so that it can alarm or shut down when the temperature exceeds the limit.

3. Stainless steel magnetic pump should prevent dry friction

(1). No idling is allowed.

(2) It is strictly forbidden to evacuate the medium.

(3). When the outlet valve is closed, the continuous operation time of the pump shall not exceed 2 minutes to prevent the magnetic actuator from overheating and failing.

Analysis of common failures of stainless steel magnetic pump

1. Problems caused by cavitation of the magnetic pump: The main reasons for the cavitation of the pump are the large resistance of the pump inlet pipe, the more gas phase of the conveying medium, the insufficient filling of the pump, and the insufficient energy head of the pump inlet. Cavitation on the pump The hazard is the most serious. When cavitation occurs, the pump vibrates violently and the balance is severely damaged, which will cause damage to the pump bearings, rotor or impeller. This is a common cause of magnetic pump failures.

2. No medium or low flow of conveying medium: make the rotor main shaft and stable bearing dry friction and burn the bearing. The magnetic pump is lubricated and cooled by the conveying medium to the sliding bearing. It slides without opening the inlet valve or outlet valve. The bearing is damaged due to high temperature due to no transmission medium lubrication and cooling.

3. Isolation sleeve damage: The magnetic coupling of the magnetic pump is cooled by the medium conveyed by the pump. If there are hard particles in the medium, it is easy to cause the isolation sleeve to be scratched or pierced. Sometimes if the maintenance method is improper, it may also cause isolation. Damage to the sleeve.

Magnetic drive pump manufacturers and suppliers from China.

stainless steel Magnetic drive pump — Stainless steel magnetic Drive pump is abbreviated as SS magnetic Drive pump in china. The flow parts are made of 304, 316L and other high-quality stainless steel materials. The inner and outer magnetic rotors are made of rare earth permanent magnets with high magnetic energy product and high coercivity. It has high efficiency and energy saving, wide media application, and durability High temperature, strong magnetism, non-demagnetization and other advantages, it is a new type of high-quality magnetic drive centrifugal pump that uses magnetic coupling to realize non-contact transmission and non-moving sealing.

Application of chemical magnetic drive pump

Application of chemical magnetic drive pump

The chemical magnetic pump is a chemical process pump that uses permanent magnets to achieve non-contact indirect transmission.

Features of chemical magnetic pump:

The chemical magnetic pump replaces the dynamic seal with a static seal, so that the flow parts of the pump are in a completely sealed state, and completely solves the inevitability of other pump mechanical seals. The chemical magnetic pump uses corrosion-resistant fluoroplastics, stainless steel, etc. as manufacturing materials, so it has good corrosion resistance and can protect the conveyed medium from pollution.

The flow parts are made of corrosion-resistant materials such as stainless steel and fluoroplastics, and the leak-free sealing structure design ensures the safe transportation of chemical fluids.

The maximum efficiency of the pump reaches 50-55%, and the design process of the pump is fully considering energy saving.

The structure is simple, and the main components are modularized for easy and quick disassembly and inspection. The wearing parts can be replaced separately.

Application of chemical magnetic pump:

It can be used as sulfuric acid pump, nitric acid pump, hydrochloric acid pump, hydrofluoric acid pump, phosphoric acid pump, acid unloading pump, unloading pump, dosing pump, pickling pump, acid circulation pump, acid circulation pump, lye pump. Reasonable design, advanced technology, fully sealed, no leakage, strong corrosion resistance, etc., widely used in: chemical industry, acid making, alkali making, smelting, rare earth, pesticides, dyes, medicine, paper making, electroplating, pickling, Radio, scientific research institutions, national defense industry and other units pump acid and lye.

Introduction to grounding knowledge of chemical pumps, motors and equipment

When the user uses a chemical pump, during the installation process, the power cord, motor and other equipment are usually grounded. What are the benefits of grounding and what protection does it play? The following introduces the basic concepts of grounding:
1. The basic concept of grounding
Grounding is an electrical safety measure taken in order to enable electrical equipment to work normally and protect personal safety. Generally, grounding is achieved by linking a metal wire with a grounding device.

2. Types of grounding equipment
There are two main types of grounding equipment commonly used for grounding, namely, protective grounding (grounding of household electrical equipment or power supply lines).
1. Lightning protection grounding equipment
Lightning protection grounding equipment is generally used on the top of high-rise buildings, mainly to prevent lightning strikes. Commonly used lightning protection grounding equipment includes lightning rods, lightning belts, lightning nets or lightning arresters. The lightning protection grounding equipment generally consists of a lightning receiving device, a grounding wire and a grounding device. These devices cooperate with each other to introduce lightning current into the ground for protection. The lightning receiving device is located on the top of the lightning protection grounding device and is a component that directly receives lightning strikes. Its function is to use its prominent position higher than the protected object to lead the lightning to itself, and use the ground wire or ground rod to introduce the lightning into the ground.
2. Protect grounding equipment
Protective grounding is a necessary grounding measure in the family. The common grounding equipment in the home is the grounding wire and the grounding rod. The grounding wire is the metal wire, which is mainly used to transmit leakage current and static charge. Ground rods, also known as grounding electrodes or grounding grids, are mainly used to introduce the leakage current, static charge or lightning current sent by the grounding wire into the ground.
When houses and buildings need to be grounded, generally, after connecting the power ground wires in the house together, insert a ground rod with good conductivity into the ground to a certain depth. The depth should be determined according to the amount of current in the house as a whole, and the ground wire and ground rod should be connected together.
Most household appliances that people use daily need to be grounded. In household appliances, if grounding protection is not used, when a part of the insulation is damaged or a phase line touches the metal shell, the metal shell of the household appliance will be charged. If the human body touches the metal shell of the appliance at this time, there will be a risk of electric shock. The field must be grounded, and the electrical outlet must be connected to the ground.
Three, the functional characteristics of grounding equipment
The main function of grounding equipment is to provide grounding protection for power supply lines, electrical equipment, etc. of homes or buildings, which can introduce leakage current, static charge and lightning current generated on electrical equipment into the ground to avoid personal electric shock, fire, explosion and other accidents.
In addition, there is another kind of grounding called protective zero connection, which refers to a protective measure that connects the shell or frame of electrical equipment to the zero line of the directly grounded point. Among them, the directly grounded point is also called the neutral point. Take the protective zero connection of three-phase electricity as an example, connect the metal shell of electrical equipment and the metal frame connected with the shell to the line of the neutral grounded power system to protect personal safety.

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Do chemical pumps need to install check valves? Introduction to the knowledge of check valve installation positions

In chemical production, chemical pumps are used a lot, mainly for the transportation of chemical liquid raw materials and sewage recycling. According to the use requirements and the particularity of the medium, a check valve needs to be installed, so what is the point of the installation position of the check valve? Can the check valve be installed for other working conditions? Check valve, also called check valve, is an automatic valve. It relies on the pressure of the flowing medium in the pipeline to push the valve flap to close and open the valve. When the medium stops flowing, the check valve flap closes, it can be effective Prevent the medium in the pipeline from flowing back, which plays a great role in ensuring the safety of the pipeline. In low-liquid-level conditions, use ordinary centrifugal pumps. The pump itself does not have a liquid storage chamber to avoid the trouble of filling the cavity each time. Then, the simple solution is to install a check valve to keep the pump cavity pipeline liquid back and cause idling, Fever machine etc.

According to the structure of the check valve, it can be divided into three types: lift check valve, swing check valve and butterfly check valve. Lift check valves can be divided into two types: vertical and straight-through. Swing check valves are divided into three types: single valve, double valve and multi valve. Butterfly check valves are divided into butterfly double flaps and butterfly single flaps. The above-mentioned check valves can be divided into four types in connection form: threaded connection, flange connection, welding and wafer connection.
1. Install the check valve first and then the gate valve or butterfly valve
Advantages: It can protect the check valve, especially in parallel pumps. When one pump does not start, its outlet door is closed, and when the other pump starts, the impact force is borne by the gate valve or butterfly valve. After the check valve fails, the inlet and outlet valve isolation system can be closed for repair.
Disadvantages: Who will protect the gate valve or butterfly valve? There was a case where the valve plate of a butterfly valve was broken.
2. Install gate valve or butterfly valve first and then check valve
Advantages: It can protect the butterfly valve or gate valve, and the impact force is borne by the check valve.
Disadvantages: Who will protect the check valve? The check valve is switched on and off by the pressure difference. If the pressure of the main pipe is high, it will be closed, and the pressure of the pump will be opened. If the flow rate used is unstable, the check valve will switch repeatedly. Affect the life of the check valve. Moreover, the check valve is broken, especially the mother control system, which can be repaired after shutting down the system.

3. Generally speaking, due to the frequent opening and closing actions of the check valve, the internal connecting parts and sealing parts are prone to damage. In order to facilitate repairs and prevent the entire system from shutting down due to the failure of the check valve, consider from this perspective, The check valve will be installed before the outlet gate valve or butterfly valve. Do you see basically this?
4. The check valve is installed to ensure the flow direction of the water inside the pump, so as to ensure the normal operation of the pump. Therefore, regarding the installation position of the check valve, whether it is installed before or after the water pump, there are two situations:
One is installed at the end of the vertical suction pipe in front of the pump, also called a bottom valve. The purpose is to fill the pump without pumping water once, because when there is no water in the pump and the suction pipe in front of the pump, the pump can only be idling and cannot pump water, so the pump must be filled with water to pump out water. The installation of this kind of water pump is a method when it is above the liquid level, also called negative pressure method.
The other is installed behind the pump. This installation method is that when the liquid level is higher than the water pump, it is convenient to start and stop the water pump without closing the water pump outlet valve, especially for the main control water pump system to prevent backflow.
The check valve must be installed at the outlet of the pump and before the outlet control valve in order to check the check valve. Generally, the first outlet of the pump is a soft connection (shock absorber), followed by a check valve, and then a block valve (such as butterfly valve, gate valve, stop valve, etc.).

Chemical pumps — PP Vertical chemical pump are Designed for the recycling, treatment, and filtration of corrosive liquids (including those with solids) having the tendency to foul, kept in constant level tanks.

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Chemical pump pipeline valve function, installation and use matters needing attention

In the configuration of chemical pumps, pipelines and valves are commonly used components. In the pipeline system, valves are control elements, just like human hands. Therefore, its importance is self-evident in life or in all walks of life. . What are the functions of the valve? how to install? What should I do if there is a malfunction? What matters should be paid attention to in valve installation?

1. Valve function
1. Cut-off and open medium
The flow channel is a straight-through valve, and its flow resistance is small, and it is usually selected as a valve for shut-off and open medium. The downward closing valve (stop valve, plunger valve) is rarely used because of its tortuous flow path and higher flow resistance than other valves. Where higher flow resistance is allowed, a closed valve can be used.
2. Control flow
Usually choose the valve that is easy to adjust the flow as the control flow. Downward closing valves (such as globe valves) are suitable for this purpose because the size of its seat is proportional to the stroke of the closing member. Rotary valves (plug valves, butterfly valves, ball valves) and flex-body valves (pinch valves, diaphragm valves) can also be used for throttling control, but they are usually only applicable within a limited range of valve diameters.
The gate valve uses a disc-shaped gate to cross-cut the circular valve seat opening. It can only control the flow better when it is close to the closed position, so it is usually not used for flow control.
3. Reversing shunt
According to the needs of reversing and shunting, this valve can have three or more channels. Plug valves and ball valves are more suitable for this purpose. Therefore, most of the valves used for reversing and dividing flow select one of these valves. But in some cases, other types of valves can also be used for reversing and shunting as long as two or more valves are properly connected to each other.
4. Medium with suspended particles
When there are suspended particles in the medium, it is suitable to use a valve with a wiping effect on the sliding of the closing part along the sealing surface. If the back and forth movement of the closing member to the valve seat is vertical, it may hold particles. Therefore, unless the sealing surface material allows particles to be embedded, this valve is only suitable for basic clean media. Ball valves and plug valves have a wiping effect on the sealing surface during the opening and closing process, so they are suitable for use in media with suspended particles.

2. Valve installation problems
A. Check before installation
1. Carefully check whether the valve model and specifications meet the requirements of the drawings.
2. Check whether the valve stem and valve clapper open flexibly, whether there is jamming or skewing.
3. Check whether the valve is damaged, and whether the thread of the threaded valve is correct and intact.
4. Check whether the combination of valve seat and valve body is firm, the connection of valve disc and valve seat, valve cover and valve body, valve stem and valve disc.
5. Check whether the valve gasket, packing and fasteners (bolts) are suitable for the requirements of the nature of the working medium.
6. The pressure reducing valve that is outdated or left for a long time should be disassembled, and dust, sand and other debris should be cleaned with water.
7. Remove the port seal and check the degree of sealing. The valve disc must be closed tightly.
B. General regulations for installation
1. The installation position of the valve should not hinder the operation, disassembly and overhaul of the equipment, pipeline and valve body itself, and the aesthetic appearance of the assembly should be considered.
2. For valves on horizontal pipelines, the valve stem should be installed upwards, or installed at a certain angle, and the handwheel should not be installed downwards. The valve, valve stem and hand wheel on the high-altitude pipeline can be installed horizontally, and the opening and closing of the valve can be remotely controlled by a vertical low chain.
3. The arrangement is symmetrical, neat and beautiful; the valve on the standpipe, if the process permits, the valve handwheel is suitable for operation with chest height, generally 1.0-1.2m from the ground, and the valve stem must follow the direction of the operator installation.
4. Valves on side-by-side vertical pipes should have the same centerline elevation, and the clear distance between handwheels should not be less than 100mm; valves on side-by-side horizontal pipes should be installed staggered to reduce the pipe spacing.
5. When installing heavier valves on water pumps, heat exchangers and other equipment, a valve bracket should be installed; when the valve is frequently operated and installed at a distance of more than 1.8m from the operating surface, a fixed operating platform should be installed.
6. If there is an arrow mark on the valve body, the direction of the arrow is the flow direction of the medium. When installing the valve, make sure that the arrow points in the same direction as the medium flow in the pipeline.
7. When installing flanged valves, ensure that the end faces of the two flanges are parallel and concentric with each other, and do not use double gaskets.
8. When installing a threaded valve, in order to facilitate disassembly, a threaded valve should be equipped with a union. The setting of the union should consider the convenience of maintenance, usually the water flows through the valve first and then the union.
Three, installation considerations
1. The valve body material is mostly made of cast iron, which is brittle, so it must not be hit by heavy objects.
2. When handling the valve, throwing is not allowed; when lifting or hoisting the valve, the rope should be tied to the valve body, and it is strictly forbidden to tie it to the handwheel, valve stem and flange bolt holes.
3. The valve should be installed in the most convenient place for operation, maintenance and repair, and it is strictly prohibited to be buried in the ground. The valves on the pipelines directly buried and in the trenches shall be equipped with inspection wells to facilitate the opening and closing and adjustment of the valves.
4. Ensure that the threads are intact and undamaged, and wrap the threads with hemp, lead oil or PTFE tape. When screwing, use a wrench to clamp the hexagonal valve body screwed into one end of the pipe.
5. When installing the flange valve, pay attention to tighten the connecting bolts diagonally, and use even force when screwing, to prevent the gasket from running off or causing deformation and damage to the valve body.
6. The valve should be kept closed during installation. For threaded valves close to the wall, it is often necessary to remove the valve stem, disc and handwheel during installation before they can be turned. When disassembling, you should turn the handwheel to keep the valve open before disassembling.

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