Fuel return check valve has the function of controlling oil capacity and avoiding fuel or
gas returning to ensure the normal operation of the machine.
THF Oil Return Check Valve
Model:THF-6
Interface Thread:G1/8"G1/4"
Maximum Pressure:15 Bar
Working Medium Temperature:-20℃~+120℃
Working Environment Temperature:-20℃~+60℃
A return check valve (also known as a return check valve) is a valve that allows a liquid (usually oil) to flow only one way and stops it from flowing in the opposite direction. It is used in the hydraulic system to prevent the oil from flowing back to the oil tank or oil pump when there is no pressure, so as to protect the system from pollution and damage, and maintain stable operation of the system.
Main functions and principles
One way flow control
The core function of the return check valve is to ensure that the fluid can only pass through the valve from one direction. When the fluid pressure direction changes, the valve will be closed to prevent reverse flow.
protection system
It protects the hydraulic pump and other parts of the system from possible contamination or damage caused by reverse fluid by preventing the return of oil.
Maintaining system stability
In the hydraulic circuit, it helps to maintain the oil pressure and flow state in the system and ensure that the system can work normally and stably.
Application Scenario
Return check valves are widely used in a wide variety of hydraulic and fluid systems and are especially important in the following scenarios:
Hydraulic power system
When the oil pump stops working, prevent the oil from flowing back from the actuator (such as oil cylinder) to the oil tank, and ensure that the system can quickly build up pressure at the next start.
lubrication system
Ensure that the lubricating oil flows according to the set path and does not flow back to the oil reservoir due to pressure change.
Relationship with check valve
Return check valve "and" check valve "can be used interchangeably in many cases, and they refer to the function of the same type of valve, i.e. preventing the reverse flow of medium.
Check valve "emphasizes only one-way flow, while" check valve "more directly expresses the meaning of" stop "reverse flow, and both describe the function of the same type of valve
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A: Yeah, but it depends products, Pls contact us ina@pneuhydr.com or whatsapp 0086 15168536055
Q: What ' s your business scope ?
A: Our business scope is service of exporter automation parts with full container, and sell air cylinder , air source treatment , solenoid valve , air valve, motorize valve , Brass valve, hydraulic valve, hydraulic cylinder, air and oil fitting, pressure gauge etc .
Q: What types of products you can make ?
A: We can make many kinds of stainless steel, brass ,aluminum materials processing .like high pressure Valve / solenoid valve / electric valve / water valve/pneumatic valve/air cylinder/hydraulic valve/hydraulic accumulator products and so on .
Q: Can the product be made with our logo and brand ?
A: Yes , of course , we can make . we are OEM supplier for years and professional to make . But you need give us the authorization if it is possible .
Q:Can you provide original famous pneumatic and hydraulic,instruments brand goods ?
A: Yes,We can supply like Festo,Smc,Ckd,Burket,Hydac,Rexroth,Siemens,Rosemount,Marsh ,Endress+Hauser etc.
Q: Is there a warranty available?
A: Yes, normally products is one year quality guarantee.
Q: Is the connector in British or Metric system? What is the difference between PT, NPT, and G threads?
A: The G thread is cylindrical and does not seal itself, requiring additional gaskets to prevent leakage. PT and NPT are conical, and the internal and external threads become tighter and tighter when tightened. Sealing is achieved through the deformation of the threads, and sealant or tape is usually used in conjunction to enhance the sealing effect
G-thread is a cylindrical straight pipe used for non sealed connections; PT thread is a conical tube that relies on the deformation and sealing of the thread itself; NPT is also a conical tube with a tooth profile angle of 60 degrees, mainly used in North America
Q: How to convert pressure units: MPa, bar, psi, kg/cm ²?
A: 1MPa=10bar≈145psi≈10kg
Q:What usually causes the burnout of solenoid valve coils?
A:Incorrect voltage and hz, frequent switching, pilot head entering liquid,valve core and spring problem,environment hot,heavy vibration etc.
Q: What should be noted for pneumatic components in high temperature or extremely cold environments?
| Focus Point |
High Temperature Environment Countermeasures |
Extreme Cold Environment Countermeasures |
| Seals |
Fluororubber, PTFE |
Low-temperature nitrile, silicone rubber, polyurethane |
| Lubrication |
High-temperature synthetic grease (low volatility) |
Low-temperature grease (low pour point, low viscosity) |
| Air Supply Treatment |
Strengthen cooling, efficient water removal |
Ultra-low dew point drying (refrigeration + adsorption type), heat tracing |
| Metal Components |
Reserve expansion clearance |
Select materials with low-temperature toughness, prevent leakage due to cold shrinkage |
| Control Components |
High heat-resistant grade coils, heat dissipation, low power consumption |
Install insulation boxes, local heating, prevent cold condensation |
| Installation |
Keep away from heat sources, add heat insulation plates |
Avoid exposure to wind and snow, wrap with thermal insulation materials |
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