1 Inch Pneumatic (Air-operated) Diaphragm Pump from china

Pneumatic (air-operated) AODD pump is a new type of conveying machine in china, uses compressed air as the power source for various corrosive liquids, liquid with particles, high viscosity, volatile, flammable and highly toxic liquid.
Pump Casing Materials: stainless steel,Polypropylene,PVDF,Cast steel, Aluminum alloy,PP, Polypropylene, Groundable, Acetal, PVDF
Diaphragm Materials: Santoprene, Hytrel, PTFE , Viton

1 Inch Plastic Pneumatic Diaphragm Pump
Maximum Flow gpm (lpm): 15 (57)
Maximum Discharge Pressure psi (bar): 100 (7.0)
Fluid Ports Inlet/Outlet (bsp): 1 inch
Air Inlet :1/4 inch
Material of Construction: Cast steel,Aluminum alloy,PP, SS, Polypropylene, Groundable, Acetal, PVDF
Maximum Solids in (mm): 3/32 (2.5)
Maximum Dry Suction Lift ft (m): 15 (4.5)

Air Operated Diaphragm (AODD Pump) Working Principle
In the two symmetrical pump chamber equipped with a diaphragm, which is connected by a center couplet stem. Compressed air comes in from pump inlet valve, and enter into one cavity, push the diaphragm movement, and gases emitted from another cavity. Once to the destination, gas distribution components will automatically compressed air into another chamber, push the diaphragm to the opposite direction, thus make two diaphragm continuous synchronization to reciprocating movement.

Compressed air goes into the valve, make the diaphragm to the right movement, and chamber suction make medium enter into, push the ball into the room, ball valve shuts down due to inhalation, Mediums discharged by extrusion, and opened the ball valve and at the same time close the ball valve, prevent back flow, thus to make medium ceaseless from the entrance inhaled, exit eduction.

Air Operated Diaphragm (AODD Pump) Main Advantages
1, Due to the use of air power, the flow automatically changed according to export resistance. Which is suitable for high viscosity fluid.
2, In inflammable and explosive environment, the pump is reliable and low cost, won’t produce spark and not overheat,
3, The pump volume is small, easy to move, no foundation needed, convenient installation and economy. Can be used as mobile conveying pump.
4, Where there are dangers, corrosive materials processing, diaphragm pump can be separated completely with outside.
5, The pump shearing force is low, physical effect to medium is small, can be used for conveying unstable chemistry fluid.

Air Operated Diaphragm (AODD Pump) Main Advantages
1, Due to the use of air power, the flow automatically changed according to export resistance. Which is suitable for high viscosity fluid.
2, In inflammable and explosive environment, the pump is reliable and low cost, won’t produce spark and not overheat,
3, The pump volume is small, easy to move, no foundation needed, convenient installation and economy. Can be used as mobile conveying pump.
4, Where there are dangers, corrosive materials processing, diaphragm pump can be separated completely with outside.
5, The pump shearing force is low, physical effect to medium is small, can be used for conveying unstable chemistry fluid

China 1 Inch Pneumatic (Air-operated) Diaphragm Pump - China Diaphragm Pump, Air Pump — China 1 Inch Pneumatic (Air-operated) Diaphragm Pump, Find details about China Diaphragm Pump, buy Air Pump from 1 Inch Pneumatic (Air-operated) Diaphragm Pump Manufacturer from China

Pneumatic Double Diaphragm Pumps Air Diaphragm Pump

Air operated diaphragm pumps also called AODD pumps, are positive displacement pumps driven and powered by compressed air rather than an electric motor. The AODD pump design means that it can cope with pretty much any fluid from water to viscous slurries to 90% solids including large, shear sensitive particles without degrading them. Air operated double diaphragm pumps are able to benefit from variable flow or pressures just by adjusting the air power supply.

Material: Stainless steel, Cast Iron, Aluminium alloy, PP, plastic, Fluoroplastic,PTFE, PFA

Size: 1/2” ~4” , DN10mm~DN125mm

Flow Rate (Q) 0 – 60 (m3/h)

Lift Head (H) 0 – 70 (m)

Pneumatic Double Diaphragm Pumps Air Diaphragm Pump also called AODD pumps,Size: 1/2 – 4”,gpm, Lift Head up to 84 m, Wetted parts material can be Aluminium alloy, PP, plastic, Fluoroplastic,PTFE, PFA, PVDF.

The Pneumatic air operated diaphragm pump design makes it suitable for use in a wide range of industries:

Waste water

Petrochemica

Food and beverages

Pharmaceutical

Mining and construction

Printing, paint and ink

AODD Plastic diaphragm pump data sheet:

MODEL	Max. Flow (LPM)	Max. Head (m)	Max. Lift height (m)	outlet pressure (kg）	size (mm)	lnlet calibar (inch)	particle size (mm)
SKQ-10	18.9	70	3	7	10	1/4	1.5
SKQ-15	18.9	70	3	7	15	1/4	1.5
SKQ-20	57	70	4.5	7	20	1/4	2.5
SKQ-25	57	70	4.5	7	25	1/4	2.5
SKQ-25A	116	84	5.4	8.4	25	1/2	3.2
SKQ-32	151	84	5.4	8.4	32	1/2	3.2
SKQ-40	151	84	5.4	8.4	40	1/2	3.2
SKQ-50	378.5	84	5.4	8.4	50	1/2	4.8
SKQ-65	378.5	84	5.4	8.4	65	1/2	4.8
SKQ-80	568	84	5.4	8.4	80	1/2	6.4
SKQ-100	568	84	5.4	8.4	100	1/2	6.4
SKQ-125	1041	84	7.6	8.4	125	3/4	10

Air Operated Double Diaphragm Pumps & AODD diaphragm pumps

Air Operated Double Diaphragm Pumps ( AODD PUMP ) not only can exhaust the flow liquid, but also can convey some uneasy flowed medium, with the merits of self-pumping pump, gear pumps,diving pump, shield pump, slurry pump and impurity pump, etc.
Air operated double diaphragm (AODD pumps) are designed for general use. They can easily pump from clean, light viscosity fluids to corrosive, abrasive medium viscosity fluids and can transfer large particles without damage. Due to their pneumatic motor, they could be used in potentially explosive areas.
1. It is unnecessary to pour the drawing water, the suction lift reaches 7 m height, the delivery lift reaches 70 m length and the export pressure ≧6kgf/cm2.
2. Wide flow and good performance.The diameter allowed to pass the max grain reaches 10 mm. The damage is very less to the pump while exhausting the slurry and impurity.
3. The delivery lift and flow can pass the pneumatic valve open to realize the stepless adjustment (the pneumatic pressure adjustment is between 1-7 kgf/cm2).
4. This pump has no rotary parts and no bearing seals. The diaphragm will completely separate the exhausted medium and pump running parts, working medium. The conveyed medium can t be leaked outside. Thus it will not cause the environmental pollution and human body safety dangerous while exhausting the toxin and flammable or corrosive medium. No electricity. It is safe and reliable while using in the flammable and explire places.
5. It can be soaked in medium.
6. It is convenient to use and reliable to work. Only open or close the gas valve body while starting or stopping.Even if no medium operation or pausing suddenly for a long time because of accident matters, the pump will not be damaged caused by this. Once over-loading, the pump will automatically stop and possesses the self-protection function.When the load recovers normally, it also can start automatically.
7. Simple structure and less wearing parts. This pump is simple in structure, installation and maintenance. The medium conveyed by the pump will not touch the matched pneumatic valve and coupling lever, etc. Not like other kinds pumps, the performance will drop down gradually because of the damages of rotor, gear and vane, etc.
8. It can transmit the adhesive liquid (the viscosity is below 10000 centipoise).
9. This pump needs the oil lubricant. Even if idling, it has any influence to the pump. This is a characteristic of this pump.

AODD pumps china — Material: Stainless steel, Cast Iron, Aluminium alloy, PP, plastic, Fluoroplastic,PTFE, PFA Size: 1/2” ~4” , DN10mm~DN125mm Flow Rate (Q) 0 – 60 (m3/h) Lift Head (H) 0 – 70 (m)

SS 304 SUS 316 316L Stainless Steel Gear Pumps

Offering you a complete choice of products which include SS rotary gear pumps, SS double helical gear pump, Stainless Steel external gear pump, Stainless steel internal gear pump, ss twin gear pump.

Stainless steel gear pumps material SS 304 316 316L, saiken SS gear pumps flow range: 0.6~570 M3/H,High quality gear pumps please from China saiken pumps manufacturer.

SS rotary gear pumps Model – KCB / YCB

SAIKEN PUMPS offer gear pump model “KCB/YCB” Which is heavy duty foot mounting type positive displacement rotary twin gear pump. Model “KCB/YCB” having three piece construction it can be easily cleanable and maintainable. These pumps having a double helical refined gear and hardened grind finished shaft, double helical gear prevent axial load & side thrust which it help to increase life and performance of pump. Model “KCB” is a bush bearing type of pump which can be used for viscous liquid having sufficient lubricating value for intermittent duty, however for continuous duty, needle roller bearing in Model “YCB” and it will be selected for liquid having low viscosity, power lubricating values if liquid containing dirt or impurities pump will independently lubricated bearing should be selected in Model ‘NYP’, liquid which tends to solidity at lower temperature the jacketing construction should be selected to facilitate the heating of the pump lay steam or thermic fluid etc.

These pumps are having flange at the end of suction and delivery which are available in 1/2″ to 14″ size. These pumps can be operated up to pressure of 14.5 kg/cm² with 10 LPM to 9600 LPM flow capacity. These pumps are suitable for liquid up to viscosity of 1, 50,000 SSU and maximum temperature up to 250ºc.

Stainless steel internal gear pump Model – NYP

NYP SS internal gear pump are self-priming, Built-in safety valve, positive displacement pumps. With the characteristics of low rotation speed and high output torque, pump shows his talents to transfer high viscosity liquid products. For example: resin and so on,Its unique working principle works with a strong drive system, ensure that the pump can output a strong driving torque at low speed, can guarantee continuous, non-stagnant transferring, and ensure that the transferred material not damage, viscosity can be as high as 300000CP.

Features & Advantages:
● Smooth & steady discharge without pulsation, little vibration and low noise.
● Outstanding self-priming capability.
● Identical rotation direction of the internal and outer rotors reduces friction and thus
increases operation life.
● Flow rates are in linear relation with rotation speed. As a result flow rates are easily
adjustable by speed regulations.
● Heating & cooling jacket may be equipped depending upon media requirements.
● Working temperature up to 200°C when suitable materials are selected.
● Ideal for high Viscosity applications.

Data Ranges:
● Media Temp.: -10 ~ 250℃
● Viscosity : 1.0 ~ 300,000 cst
● Pressure: 0.4Mpa, 0.6Mpa, 0.8Mpa, 1.0Mpa
● Displacement: 0.78 ~ 1670 L/100rev

china supplier of Magnetic Drive Hot Oil Pumps

The magnetic drive hot oil pumps uses magnetic drive to realize the contactless transmission of torque. It is a new industrial pump without shaft seal, no leakage and no pollution, which is designed to completely solve the leakage of mechanical transmission pump shaft seal.

Hot water: +50℃-180℃
Thermal conductivity water:+50-180℃
Thermal conductivity oil:+50-350℃
Top Thermal conductivity oil: ~ +450℃
Low temperature liquid: -100℃ ~ +40℃

high temperature magnetic pump Applications：

1. High temperature,

2. low temperature,

3. magnetic pump,

4. used for cryogenic machine, refrigerating machine,

5. special pump for mould temperature machine,

6. special pump for reaction kettle

china supplier of Magnetic Drive Hot Oil Pumps

high temperature magnetic Thermal oil pump — The magnetic drive centrifugal hot oil pumps uses magnetic drive to realize the contactless transmission of torque. It is a new industrial pump without shaft seal, no leakage and no pollution, which is designed to completely solve the leakage of mechanical transmission pump shaft seal.

Hot oil pumps & thermal oil pumps

Hot oil pumps & thermal oil pumps,This centrifugal pumps mainly use for thermal oil circulation. structure can be centrifugal hot oil pump and gear hot oil pump. Thermal Oil Pump Manufacturer & supplier best price from china saiken pumps

RY Hot Oil Pump is widely applied in the heating system with heat transfer medium in many industrial fields, such as petroleum, chemical industry, rubber, plastics, pharmacy, textiles ,printing and dyeing, foodstuff industry, road construction. It is an ideal circulation pump for hot oil and mainly used in transferring weak corrosion and high temperature liquid, but without solid grains, and whose temperature is below 370 ℃.

Thermal oil pumps specification：

Size: DN20-250mm
Capacity: 4.5-1300m3/h
Head: 15-130m
Working temperature: ≤400℃
Material: Cast iron, Cast steel, SS304, SS316, SS316Ti, SS316L, CD4MCu, Titanium, Titanium Alloy, Hastelloy Alloy etc

Hot oil pumps Design Features:

1. RY hot oil pump is the second generation of oil pump product developed on the basis of digesting foreign oil pumps. Its basic structure is single-stage single-suction cantilever let support, which has an axial suction inlet and a centrally vertical outlet. It is mounted on the base along with the motor.
2. RY thermal oil pump adopts a double-end ball bearing support with the front end using the lubricating oil while the back end using teh grease as the lubricant, and an oil conduit lying in between for always keeping an eye on the sealing and the recovery of conduction oil.
3. RY hot oil pump adopts the self-heating and abstraction of heat structure instead of the traditional water cooling structure, thus featured by a simple and space-effective, fewer operating costs, good peformance and reliable operation.
4. RY hot oil pump conbines packing seal and mechanical seal, the former has a good adaptability for the thermal state due to useing packing with resistance to high temperature while the latter ensures the seal performance under high temperature as it adopts the hard alloy with strong mechanical strength and wear resistance.
5. RY hot oil pump adpots the third generation of PTFE for the lip seal, thus getting great performance in the seal performance, the rubber seal, and extremely strong resistance to corrosion.
If you have any queries or hot oil pump specifications, please email me: annie@saikenpumps.com / Whatsapp : +8617731766260

BRY type Thermal Liquid / Hot Oil Pumps

BRY type Hot Oil Thermal Liquid pumps is coupling type circulation pump for transferring the high temperature conduction oil. The entrance of the pump is axial suction, the exit is vertical center. Transferring medium is conduction oil without the particle and fiber.
∗ Single stage end suction centrifugal structure pump with high temperature oil sealing for hot oil with temperature ≤350°C.
∗ Air cooling structure, without additional cooling device. Self-lubricating bearing.
∗ Works as hot oil(thermal oil) system booster pump for boiler, bitumen, resin, spinning and printing, dyeing, plastic and rubber processing, foodstuff industry, etc.

Capacities to 2,200 GPM (500 m3/hr)
Heads to 425 feet (130 m)
Pumping temperatures to 650°F (343° C)
Working pressures to 350 PSIG (2,413 kPa)
Horizontal, end suction, back pull-out design
Centerline supported casing

Hot Oil/Thermal Liquid
Heat Transfer
OEM Applications

BRY type Thermal Liquid / Hot Oil Pumps — BRY type Hot Oil Thermal Liquid pumps is coupling type circulation pump for transferring the high temperature conduction oil,Made of cast steel or stainless steel, Max capacity 1000m³/h，head 150 m,Top quality best price

NYP Series Internal Gear Pump

Technical Parameters of NYP Series Internal Gear Pump
MODEL:NYP0.78,NYP2.3,NYP3.6,NYP7.0,NYP24,NYP52,NYP80,NYP111,NYP160,NYP320, NYP220,NYP650,NYP727,NYP1670.
Rotational speed: 85r/min-1450r/min
Swept volume: 0.78L/100rev-1670L/100rev
Capacity up to 200 m³/h
Max pressure: 145 PSI

NYP Series Internal Gear Pump, a kind of positive displacement pump, makes a fluid move by trapping a fixed amount and forcing that trapped volume into the discharge pipe. The flow of pump only depends on the change of chamber volume and the change frequency, rather than the discharge pressure. While working, a pair of synchromesh gears drives a pair of rotors to simultaneously rotate at opposite directions. By doing so, the volume of pump has been changed; higher vacuum degree and discharge pressure have been achieved. This lobe pump is especially suitable to transfer hygiene-degree media and highly corrosive and viscous fluids.

Application Ranges of Viscous Fluid Pump
This heavy oil transfer pump has been widely used mainly in three kinds of media. (1) Fluids that are pure and have a certain degree of viscosity, such as lube oil and crude oil. (2) High-viscosity materials that contain no particles, like rubber, asphalt, paint, adhesives, dyes, lubricants, polyols, food and medicine. (3) High-temperature and high-viscosity polymers, like PA, PB, PC, PE, PS, HIPS, ABS, PP, PET and PVA.

Attractive Advantages of NYP Series Stainless Steel Internal Gear Pump
The viscous fluid pump body and cover are both good quality and highly precise thanks to modern process and advanced precise-casting techniques.

We provide two kinds of sealing design. One is mechanical sealing, noted for zero leakage and suitable for lubricant media. The other type is packing sealing whose attractive characteristics include good elasticity, self-lubrication, abrasion resistance and high chemical stability. Clients can choose according to working requirements.

Trouble shooting method of stainless steel gear oil pump

If the stainless steel gear oil pump is not running normally or there is a phenomenon of seizure, this situation is more common in the inflexible rotation of the needle. The axial clearance and radial clearance of the pump body are too small. The concentricity of the cover and the shaft is insufficient. The concentricity of the pump and motor coupling is insufficient. The pressure valve is malfunctioning. There are impurities in the gear oil pump.

The SS gear oil pump is composed of gears, shafts, pump bodies, safety valves, shaft end seals and other components. After heat treatment, the gears have high hardness and strength, and are installed together with the shaft in a replaceable sleeve to run. The lubrication of all parts in the stainless steel gear oil pump is automatically achieved by using the conveying medium when the pump is working. The pump has reasonable designed drain and oil return grooves, which is the smallest torque force the gear bears in the work, so the bearing load is small, the wear is small, and the pump efficiency is high. The pump is equipped with a safety valve as overload protection. The full return pressure of the safety valve is 1.5 times the rated pump pressure, and it can also be adjusted according to actual needs within the allowable discharge pressure range. But note that this safety valve cannot be used as a pressure reducing valve for a long time, and it can be installed separately on the pipeline.

china stainless steel gear oil pump Manufacturer & supplier

The main problem of the stainless steel gear oil pump is one: the shaft of the gear pump pump is stuck and cannot move.

Analysis problem: The selection of materials should be reasonable when used in combination with different stainless steel materials. According to the acidity and alkalinity of the medium and the degree of lubrication, the stainless steel material selection of the overcurrent parts of the stainless steel gear oil pump is preferred. The selection of stainless steel gear oil pumps is generally divided into: stainless steel gear material , 316 stainless steel, 316L stainless steel and 2Cr13. These materials will be heat-treated, quenched, nitrided, or carburized after processing, thereby increasing the hardness of the stainless steel gear oil pump gear and extending the gear wear life of the stainless steel gear oil pump. Due to the different hardness of the materials selected for different parts of the stainless steel gear oil pump, the viscosity of the medium conveyed by the stainless steel gear oil pump is generally low, and the medium conveyed by the gear pump is not lubricated. The friction temperature and height of the local parts of the stainless steel gear oil pump during operation are zero due to temperature changes The components expand due to heat, and the gap between the components becomes instantaneously narrowed, causing the stainless steel gear oil pump to jam the shaft. Another situation is that the stainless steel gear oil pump is equipped with a graphite packing seal. Because the seal is too tight during assembly, the temperature and height of the sealing part of the gear pump during operation cause the sealing shaft to be stuck.

Stainless steel gear oil pump main problem two: gear pump seal leakage problem:

Reasons for analysis: Generally, stainless steel gear oil pumps choose a combination of PTFE packing and fluororubber skeleton oil seal. The main reason for the leakage of stainless steel gear oil pump seals is the non-lubricity of the medium delivered by the gear pump, the medium viscosity is low, and the use pressure Caused by higher factors. The non-lubricity of the medium and the radial runout of the gear cause the gear pump seal to accelerate wear and tear with the gear shaft, so when choosing the gear pump seal, you must choose a seal that has good corrosion resistance and good wear resistance, and choose a stainless steel gear oil pump When choosing bearings or bushings, be sure to choose materials with strong wear resistance. Otherwise, the gear pump seal will leak due to the radial runout of the gear shaft due to the wear of the gear pump bearing or the sleeve.

The main problem of the stainless steel gear oil pump is three: the gear pump does not suck the material or the flow rate is insufficient.

Reason for analysis: Often this situation occurs when the stainless steel gear oil pump conveys a medium with low viscosity, such as toluene, ethanol, diesel, solvent, various acid solvents, etc. Due to the low viscosity of the medium delivered by the gear pump and the lack of lubricity of the conveyed medium, the gap between the gear end face of the gear pump and the bushing wears too quickly, which increases the internal clearance of the stainless steel gear oil pump, thereby increasing the internal leakage of the gear pump causing the gear pump The delivery flow rate is reduced, and the serious case may cause the gear pump to not suck the material.

Instructions for use of high viscosity gear pump

Before starting operation, the Botou Saiken high-viscosity gear pump fills the casing of the gear pump with liquid to be conveyed, which is convenient for stable start. If the ambient temperature is lower than the freezing point, hot steam should be pre-introduced into the pump for pre-heat treatment before the gear pump can be started. The rotation direction of Seken high-viscosity gear pump should be consistent with the inlet and outlet. If the gear pump is run once, or used after a long period of inactivity, it is better to run for about an hour under no-load or light-load conditions. If abnormal temperature rise, leakage, vibration and noise are detected in advance during the running-in phase, the machine should be shut down for inspection. Ensure the stability of the pump delivery. The solid casting of the whole piece of material avoids the impact on the seal and bearing due to vibration and strong external force. Large flow pump can work under high pressure. The strong thickened shaft guarantees the stability of pump delivery. The insulation jacket is integrally cast, with good insulation effect and zero leakage. It is widely used in the transportation of various fluids, especially for the handling of fluids with large changes in viscosity and a wide range.

Saiken high viscosity gear pump instructions for use:

1. The lower operating speed of the gear pump should not be lower than 600r / min.

2. Working medium: Recommended oil: use l-hm46 or similar viscosity hydraulic oil in summer and l-hv low temperature hydraulic oil in winter. Working oil range: -20 ℃ ~ 90 ℃, the filtering accuracy of working medium should be within 50m.

3. The support or flange of the Seken high-viscosity gear pump and its drive motor should use a common installation foundation. The foundation, flange or support must have sufficient rigidity to reduce vibration and noise generated by the gear pump during operation .

4. The motor and gear pump must be connected by an elastic coupling, the coaxiality is less than 0.1 mm, and the inclination angle should not be greater than 1 degree. Do not hit with a hammer when installing the coupling, as it may damage the gears and other parts of the gear pump.

5. If driven by pulleys, sprockets, etc., bracket support should be provided to prevent the radial bearing of the driving gear bearing. When tightening the ground screws of the gear pump and motor, the screws should be evenly stressed and connected reliably.

6. When rotating the coupling by hand, you should feel that the gear pump can easily rotate without abnormal phenomena such as seizure, and then you can piping.

Seken heavy viscosity gear pump is suitable for conveying fluid with corresponding viscosity, can be used for conveying oil products such as lubricating oil, crude oil, etc .; can also be used for conveying rubber, asphalt, paint, adhesives, dyes, paints, lubricants , Polyols, food, medicines and other high-viscosity materials that do not contain particulate impurities; can also be used to transport high-temperature, high-viscosity polymer melt materials such as PAPBPCPEPSHIPSABSPPPETPVA. If there is no outlet pressure or lack of pressure in Seken high-viscosity gear pumps, the output power of the electrical head is too small, and the gear oil pump displacement is too large or the pressure is adjusted too high, it will also form a pressure shortage. Of course, when the pressure gauge is damaged or the pressure gauge does not show pressure when it is infarcted, it can be replaced with a new pressure gauge to search. A variety of high temperature resistant packing seals, special materials and special designs have created the miracle of packing seals over mechanical seals.

The inner diameter of the oil suction pipeline of Seken high viscosity gear pump should be large enough, and avoid narrow passages or sharp bends, reduce elbows, remove unnecessary valves and accessories, reduce the installation height of the pump as much as possible, shorten the length of the oil suction pipeline Reduce pressure loss. The sealing of pipe joints and other components should be good to prevent the intrusion of air, thereby controlling the occurrence of cavitation and cavitation. Check valve and control valve Install a check valve on the output pipeline of the gear pump. In this way, when the pump and the output pipeline are repaired, the liquid in the system will not reverse. When the gear pump stops with a load, it can also prevent the pump from reversing and generate a partial vacuum in its output pipeline. It should be noted that the outlet check valve cannot be reversed or stuck. The outlet pipe of the Seiken high-viscosity gear pump should also be provided with a protective device such as a stabilizing valve, so that once the outlet channel of the pump is blocked, the control valve can be opened to relieve the pressure. The stabilizing valve can be cast integrally with the pump body or pump cover, or it can be assembled separately. For Seiken high-viscosity gear pumps that require forward and reverse rotation, control valves are required on the inlet and outlet pipes