Pressure Relief Valve

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This valve relieves excess line pressure while protecting the installation, with the fluid inlet connected to port A and outlet at port B. When pressure exceeds the set value, fluid exits through port C. Spring pressure adjustment determines the required line pressure. The valve member is placed within the body via D, followed by spring 11's introduction into the valve member. Sealed adapter 4 screws onto the body, touching the spring. As line pressure increases, the valve member lifts off its seat, adjustable via the adjusting screw 3. A washer of specific thickness 't' is used between the body and sealed adapter for sealing and spring pressure adjustment purposes. Seal 10 prevents oil leakage between the adjusting screw and adapter, with lock-nut 12 securing the adjusting screw. The manual pressure relief method uses seal 10 in the body groove E, control rod 7 passing through the oil seal and adapter 6 being screwed onto the body. Control screw 5 is inserted through the adapter to modify the position of the control rod. Finally, control knob 8 is screwed onto the control screw and fastened with a pin. When operated, the knob forces the control rod, causing the valve member to move away from its seat, allowing fluid to pass through port C; washer 9 between the body and adapter acts as an oil seal and controls control rod travel. Reversing knob operation returns the valve member to its seat due to spring pressure and the control rod's influence of oil pressure.