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CVS Controls Series 128

The CVS Series 128PQC Control Valve body assembly is suitable for on-off dump valve service in oil and gas production applications, in either sweet or sour gas conditions. This valve is 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.

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Series 128

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.

Flow Characteristic: Quick Opening with a 45o taper plug.

The CVS Series 128PQC valve is 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.

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