Patent ID: 6571822
Filing Date: 2003-06-03
Classification: F16K,Y10T

Abstract:
A relief valve connected to a pressurized fluid source to relieve excess pressure, the valve comprising:a body having a central bore and at least one transverse bore, the central bore housing a plunger, the central bore being of a diameter to allow the plunger to slide without friction within the central bore, the plunger having a valve open position and a valve closed position; a valve bonnet having a central bore defining a housing for the valve body and a spring, the spring being in contact with the plunger, the housing adapted to threadably engage an adjusting screw so that a set point for the relief valve can be adjusted by rotation of the adjusting screw, the valve bonnet further including at least one transverse bore in fluid communication with the body transverse bore; an adapter block defining a valve outlet port, the outlet port being in fluid communication with the valve bonnet transverse bore; and a valve cap having a central bore defining a valve inlet port connected to the pressurized fluid source, the valve cap central bore including a sealing assembly, the valve cap threadably engaging the valve bonnet to secure the body, plunger and spring within the bonnet central bore; whereby upon pressure from the fluid source exceeding the set point the plunger is forced into the valve open position allowing fluid to flow from the inlet port to the outlet port, and upon a decrease in pressure below the set point the spring urges the plunger into the valve closed position wherein the plunger is in sealing contact with the sealing assembly, the plunger experiencing friction only at the point of contact with the sealing assembly.