CONTROL VALVES - Series 128PQC
The CVS Series 128PQC 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
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.
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.