Siemens 656-0019 2-WAY NO 1/2" ANGLE UNION VALVE, 2.1CV, PNEUMATIC ACTUATOR, 5-10 PSISiemens 656 0019 2 way NO 1 2" angle union valve, 2. 1Cv, pneumatic actuator, 5 10 psiThe normally open 656 angle union valves are pneumatically operated valves designed to control the flow of both water and steam. This normally open valve is 1 2" line size with 2. 1Cv. The actuator is a 2" pneumatic with 5 10psi spring range. The normally open 656 angle union valves are pneumatically operated valves designed to control the flow of both water and