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How Does Back Pressure Affect Valve Set Pressure And Capacity? |
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Answer» Back pressure reduces set pressure on a one-to-one basis, i.e., a valve set at 100 PSIG subjected to a BACKPRESSURE at the outlet of 10 psig will not actuate until system pressure REACHES 110 psig. Back pressure drastically reduces capacity; typically backpressure of 10% of set pressure will decrease capacity by 50%. Specific capacity reduction should be determined by the user on a case-by-case basis by flow TESTING. Back pressure in excess of 10% of set pressure is not recommended. Back pressure reduces set pressure on a one-to-one basis, i.e., a valve set at 100 psig subjected to a backpressure at the outlet of 10 psig will not actuate until system pressure reaches 110 psig. Back pressure drastically reduces capacity; typically backpressure of 10% of set pressure will decrease capacity by 50%. Specific capacity reduction should be determined by the user on a case-by-case basis by flow testing. Back pressure in excess of 10% of set pressure is not recommended. |
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