Pressure Balanced Valve Assembly With Double Seating

Abstract: A valve assembly 100 comprises a valve body 20 with an upstream inlet 22, a downstream outlet 23, and first and second valve elements 31, 33 located between them and engageable with and disengageable from first and second valve seats 32, 34 respectively. The first valve seat 32 has a diameter which is less than that of the second valve seat 34. An actuator 12 is operable to engage and disengage the valve elements 31, 33 with the valve seats 32, 34 to close and open the valve assembly 100. The assembly 100 is configured to provide a first flow path from the inlet 22 to the outlet 23 when the first valve element 31 is disengaged from the first valve seat 32 and to provide a second flow path from the inlet 22 to the outlet 23 when the second valve element 33 is disengaged from the second valve seat 34. Upon operation of the actuator 12 to open the valve, initially the first valve element 31 disengages from the first valve seat 32 to permit fluid flow through the first flow path in order to equalise upstream and downstream pressure on the second valve element 33. Further operation of the actuator 12 disengages the second valve element 33 from the second valve seat 34 to permit fluid flow through the second flow path. (Figure 1)

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