CONTROL VALVES - Series 128PQ

The CVS Series 128PQ Control Valve body assemblies are suitable for on-off dump valve service in oil and gas production applications, in either sweet or sour gas conditions. These valves are also useful for on-off high-pressure control of numerous gasses and liquids, and can be used with materials that are viscous or erosive.

This is a single port valve with unbalanced stem-guided valve plug, and push- down-to-close valve plug action. Operated by a Type 128 spring-and-diaphragm actuator, the assembly can be operated in a normally open or normally closed application. This setting can be reversed in the field with minimum disruption and no additional parts.

CVS Type 128PQC is a 1-inch Control Valve, standard configuration is with a solid pipe plug threaded into the bottom connection for straight-through flow. To convert the control valve to angle flow, the pipe plug can be installed in the left port.

Note: This configuration from straight-through flow to angle flow can be achieved in the field.

CVS Type 128PQ is a 2-inch Control Valve with globe-style design.

All CVS Series 128PQ valves are available with soft-seat, cageless soft seat, or all metal seat construction. All configurations have push-down-to-close valve plug action.

The valve plug shuts off against the integral seat ring in the cage, except in cageless soft-seat construction, where the shut-off is against the seat which is cut into the web of the valve body. Rotation of the valve plug is limited with the use of a nylon insert in the valve plug thread.