Pressure relief valve

Details Pressure relief valve Pressure relief valve

1992-06-05

1993-03-23

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

1374925, G05D 1604

Patent

active

051955563

ABSTRACT:
A pressure relief valve (1) has a relief piston (5) for a large stream of oil and a precontrol piston (11) for a small stream of oil for influencing the point of actuation of the reliefing piston. Both pistons (5 and 11) are part of seat valves. The pressure relief valve is to be constructed so that the maximum pressure adjusted at high oil viscosity declines. In that way, the hydraulic apparatus containing the pressure relief valve is protected against overloading at low temperatures. For that purpose, the precontrol piston (11) has a bushing-shaped extension (26) that projects into a drilled hole (25) that is connected with an outlet (23). Furthermore, a ring surface (A1) is provided at the precontrol piston (11) that acts in the direction of opening. By means of the extension (26), a pressure-regulating section (27) that is dependent upon viscosity comes into play that generates a dynamic pressure that acts upon the ring surface (A1) when the oil is cold. The dynamic pressure on the precontrol piston (11) that increases when the oil is cold causes a greater drop in pressure in the interior space (17) so that the relief piston 5 clears a larger opening section.

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