Siemens 658-0012 1" VALVE SIZE, 10 CV, NORMALLY OPEN,ANGLE UNION, 2 TO 6 PSI, EQUAL PERCENTAGESiemens 658 0012 1" Valve Size, 10 Cv, Normally Open,Angle Union, 2 to 6 psi, Equal Percentage This Powertop 2 Way Angle Union Valve is designed to control the flow of steam, water and ethylene glycol solutions with normally open action. This valve is 1" in size, has a flow rate of 10 Cv, a spring range of 2 to 6 psi, and an equal percentage flow characteristic. Other features of this valve include an actuator that can be rotated to facilitate piping