CVS 128PQC
Series Control
Valve
Introduction
Contents
Contained in this manual are installation
instructions, maintenance procedures and parts
information for the CVS 128PQC Control Valve.
Refer to the appropriate manuals for instructions
for the accompanying instrumentation and other
equipment.
Trained or experienced personnel should carry
out operation and installation of all pressure
equipment. If you have any questions regarding
the equipment, contact your CVS Controls
representative.
Description
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.
Instruction Manual
Figure 1: CVS Type 128PQC Control Valve
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 as shown in Figure 2. Note: This
configuration from straight-through flow to angle
flow can be achieved in the field.
Flow Charcteristic: Quick Opening with a 45
o
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 (Figure 2).
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.
Head Office
3900
– 101 Street
Edmonton, Alberta, Canada T6E 0A5
Office: (780) 437-3055
Fax: (780) 436-5461
Website: www.cvs-controls.com E-Mail: [email protected]
Calgary Sales Office
3516 114 Avenue SE
Calgary, Alberta, Canada T2Z 3V6
Office: (403) 250-1416
Fax: (403) 291-9487