Regport Technologies Pvt. Ltd. Ambarnath, Mumbai, Maharashtra

Conventional Safety Relief Valves are those which work on simple working principle of force balance. The operation of a conventional spring-loaded PSV/SRV is based on a force balance principle. Under normal operating conditions, until the pressure at the inlet is below the set pressure or opening pressure, the disc is seated on the nozzle preventing flow through the nozzle. When the pressure at inlet exceeds set pressure/opening pressure, then pressure force on the bottom of disc overcomes the spring force, lifts the disc affecting opening of valve and relieves the excessive pressure in system.   When the inlet pressure drops sufficiently below the set pressure / opening pressure, the spring force overcomes the pressure force, the disc re-seats on nozzle and valve closes.   In REGPORT conventional Safety Relief Valves, an adjustable Blow Down Ring is provided for adjusting the opening in the annular orifice, thus controlling the pressure build-up in the huddling chamber. This controlled pressure build-up in the huddling chamber will overcome the spring force causing the disc to move away from the nozzle seat, and the valve will pop open. With this, fine adjustment in over pressure and blow down can be done. As a standard, unless specified, all our Safety Relief Valves are Full Nozzle Full Lift and tested for 10% over pressure. Following Series of Models are supplied

A balanced pressure relief valve is a spring loaded pressure relief valve which incorporates a bellow or other means of balancing the valve disc to minimize the effect of back pressure on the performance of characteristics of the valve.   When superimposed back pressure is applied to the outlet of a spring loaded pressure relief valve, a pressure force is applied to the valve disc, which adds to spring force. This added force increases the pressure at which an unbalanced pressure relief valve will open.   If the superimposed back pressure is variable then the pressure at which the valve open will vary.   In balanced bellow pressure relief valve, a bellow is attached to the disc holder with a pressure area, approximately equal to the seating area of the disc.   Conventional PRV shows unsatisfactory performance when excessive back pressure develops during relief, due to the flow though the valve and outlet piping.   The back pressure tends to reduce the lifting force which holding the valve open. Excessive built up back pressure can cause the valve to operate in an unstable manner. This instability may occur as flutter or chatter.   In convention PRV, built up back pressure should not exceed 10% of the set pressure at 10% allowable overpressure.   Balanced Pressure Relief Valve should be used where the built up back pressure is too high for conventional pressure relief valves.   REGPORT offers Balanced Bellow Safety Relief Valves to overcome this effect of built-up or Super-imposed back pressure.   Balanced valves can typically be installed, where the total back pressure does not exceed 50% of the set pressure.