Minimum pressure valve has the functions of opening/closing,pressure maintaining and backstopping,and offers stable and reliable performance.
MPV Minimum Pressure Control Valve
Model:MPV-25A
Orifice:25mm
Opering Pressure:4~5 Bar
Maximum Pressure:15 Bar
Working Medium Temperature:-20℃~+120℃
Working Environment Temperature:-20℃~+60℃
A Minimum Pressure Valve (MPV) is a pressure-regulating valve that maintains a minimum pressure in a system, often used in rotary screw air compressors to ensure proper lubrication and protect the air-oil separator. At startup, the MPV is closed to allow pressure to build; once a preset minimum is reached, it opens to allow airflow while its built-in check valve prevents backflow at shutdown, ensuring consistent system operation and longevity.
How it Works
Startup: When the compressor starts, the valve is closed, allowing pressure to build within the air-oil separator.
Opening: As system pressure increases, it overcomes the spring force in the valve, causing it to open.
Full Flow: At normal operating pressure, the valve opens fully, allowing the compressor's output to pass through with minimal pressure loss.
Shutdown: If the system pressure drops below the preset minimum, the valve closes.
Check Valve Function: A separate, integrated check valve then closes to prevent air from flowing backward into the compressor during shutdown.
Key Functions
Oil Lubrication:
The MPV establishes a minimum pressure required for lubricating oil circulation in the compressor.
Component Protection:
It prevents compressor damage and ensures the air-oil separator functions correctly by avoiding excessively low pressure.
Smooth Operation:
By maintaining a stable pressure, the MPV prevents issues like cavitation and contributes to the smooth operation of hydraulic and air systems.
Symptoms of a Faulty MPV
Low oil pressure or low temperatures.
Odd compressor noises.
System instability or inefficienc
Q: Could you offer the free samples ?
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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