ACCUMULATOR UNLOADING RELIEF VALVE
Mounting Surface: Oilgear Standard 600Max Pressure: 5000 PSI (345 bar)
Rated Flow Rate: 0.2 gpm (0.8 l/min)
The HSAUR valve is used with a HSP (poppet) valve and a HSC (check) valve to unload the pump and maintain a preset pressure in an accumulator system.
While the accumulator is being charged, the HSAUR valve is in the closed position, the poppet of the HSP valve is balanced and blocks the flow thru the valve, and the HSC check valve opens and allows the pump to deliver fluid to the accumulator and system. When the system and accumulator are fully charged, pressure at port 2 of the HSAUR valve pushes the ball off its seat while pressure at port 1 pushes the pin up against the ball. When the ball is off its seat, the vent port of the HSP valve is open to drain, allowing the poppet valve to open and unloading the pump delivery directly to the reservoir. The differential ratio between the ball seat and the pin diameter dictates the re-seat pressure percentage.
The HSAUR valve should not be used without HSP and HSC valves which must me sized to match the pump delivery.
Several maximum pressure and re-seat pressure ratios are offered in each adjustable spring ratio. The cartridge is constructed of steel parts, and all operating parts are hardened and ground as needed. The cartridge is designed for ease of service and field repair.
|Rated Flow||0.2 gpm||0.8 l/min|
|Max Operating Pressure||5000 psi||345 bar|
|Normal Reseat Pressure as a Percentage of Unloading Pressure Setting||33%||1000 psi||69 bar||2500 psi||172 bar||466 psi||317 bar|
|22%||880 psi||61 bar||2300 psi||159 bar||4100 psi||283 bar|
|17%||820 psi||57 bar||2000 psi||138 bar||3850 psi||266 bar|
|12%||770 pai||53 bar||1900 psi||131 bar||3600 psi||248 bar|
|9%||750 psi||53 bar||1750 psi||121 bar||3400 psi||235 bar|
|Viscosity Range||27 to 2000 SSU at 100 °F||1 to 432 cSt|
|Temperature Range||-40 to +350 °F||-40 to +175 °C|