Unloader Valve
Zhuji Juntai Auto Spare Parts Co.,Ltd is Brake valves such as clutch servos, air dryer, levelling valves and some other valves; Lubrication system parts like grease gun, fittings and valve.
Why choose us
Production Equipment
CNC Process Center; Sandblasting machine, CNC lathe, drilling machine, lifter, crimping machine, computer digital display test bench, assemble product line.
Production Market
Our products are exported to over 100 countries in Southeast Asia, Europe, Africa, America, and other regions, as well as domestic automotive after-sales markets and repair shops. The annual transaction volume exceeds 20 million yuan.
Our Service
We have a professional sales team who can answer various inquiries from customers about our products.
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Hydraulic fluid |
Mineral oil according to DIN 51524 (other fluids on request) |
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Fluid temperature range |
– 20 to 80 °C |
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Ambient temperature range |
– 30 to 50 °C |
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Viscosity range |
5 to 400 mm²/s |
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Porting |
NG 6 according to DIN 24340 / ISO 4401 / CETOP RP 121 H |
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Max. operating pressure connection P |
700 bar |
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Max. operating pressure connection A, T |
350 bar |
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Max. flow rate |
25 l/min |
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Pilot pressure adjustable |
25 bar up to 350 bar |
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Filtration (recommendation) |
According to NAS 1638 class 6 resp. ISO/DIN 4406 17/15/12 |
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Weight |
2.1 kg |
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Material |
Valve body: Steel, galvanized, chromated |
Advantages of unloader valve
Increases compressor production and efficiency
An unloader valve helps the compressor run more efficiently by releasing any excess pressure that could otherwise damage the machine. This allows for better compression without having to stop every few minutes from releasing the pressure.
Prevents compressor overload
An unloader valve prevents the compressor from overloading, which can cause it to fail. By releasing the excess pressure, the unloader valve allows for continuous compression and prevents dangerous pressure build-up.
Reduces wear on compressor parts
The constant cycling of a compressor can wear down the internal parts over time. An unloader valve can help reduce this by allowing the compressor to run at lower pressure for longer periods. This will aid in the long life of your compressor.
Keeps machine running cooler
As a result of heat generated by compression, the compressor can be damaged over With an unloader valve, heat is dissipated, and the machine stays cooler.
Prevents the formation of water vapor
When hot compressed air is discharged, it can cause the formation of water vapor. An unloader valve can help reduce this by allowing the compressed air to escape directly from the machine. This prevents the build-up of water vapor inside the compressor, which can lead to corrosion and damage.
Types of Unloading Valves
Direct Operated Pressure Unloading Valve
Direct Operated Pressure Unloading Valves have a spool held in the closed state by a spring. (Spool is a cylindrical unit that has a large diameter and is machined to slide in a close-fitting bore of a directional control valve body) during the normal condition, the spool would block the flow from the inlet to the tank.
Pilot Operated Pressure Unloading Valve
If there is a need such that it is necessary to control the main valve, then the unloading valve is made up of pilots. The plunger which is present in the main valve has a port that transfers the system pressure on both ends of the plunger.
The valve will be closed as pressure is exerted by the spring. When the pressure on the system is dropped to a certain preset value, the valve would close. These valves can control the opening and closing pressure.
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Problems |
Probable Causes |
Solutions |
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Unloader cycles when trigger is pulled |
Restricted discharge (Blocked Nozzle) Spray nozzle is too small Clogged chemical injector (if fitted) |
Remove restriction Replace with correctly sized nozzle Clean / replace chemical injector |
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System does not come up to pressure |
Spray Nozzle is too large Partially blocked nozzle Pump starved of water / stuck / sticking valves |
Replace with correctly sized nozzle Clean / replace nozzle Inspect pump, repair or replace worn parts |
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Pressure Spikes |
Unloader incorrectly adjusted Less than 5% of flow is in bypass |
See instructions above for unloader adjustment |
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Unloader does not bypass causing motor to labour or stall |
Foreign material or particles in unloader Pumps starved of water Leaks in system |
Check filters and clear unloader of debris Inspect pump and inlet for blockages Correct any leaks on inlet and outlets |
Our factory
Our factory has professional technicians team and excellent sales team, which can help us to provide our clients good quality and perfect service.
Certification
ISO 9000 certificate of conformity of quality management system certification; certificate of utility model patent; SGS gold plus supplier assessment certificate.
