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Instruction Manual
CVS Type 657
Diaphragm Actuator
Sizes 30-70
All CVS Controls equipment, including actuators, are
to be installed and maintained in accordance with
instructions supplied by CVS Controls. Only
qualified personnel may install and service the
actuator, and, if necessary, contact a gas service
person.
Introduction
The CVS Type 657 Actuator is used for the
automatic operation of control valves, and is
designed as a direct acting, spring-opposed
diaphragm. By varying the pneumatic loading
pressure on the actuator diaphragm, the valve plug
within the body will open, close or throttle.
When the loading pressure is increased within a
direct-acting diaphragm actuator the actuator stem
moves downward, compressing the spring. A
decrease in pressure will cause actuator stem to
move upward with the decompression of the spring
(Figure 2).
The valve plug action of the CVS Type 657 Actuator
can be set to "push down to close" or "push down to
open" and will then either open or close the control
valve upon failure of the loading pressure. When the
loading pressure fails, the diaphragm of the actuator
moves to the extreme upward position and performs
the selected action.
Refer to Table 1 for the specifications for various
sizes of CVS Type 657 Actuators. All accessories
used with the CVS 657 have individual manuals
which should be consulted regarding installation,
operation and maintenance.
Head Office
3900 – 101 Street
Edmonton, Alberta, Canada T6E 0A5
Office: (780) 437-3055
Fax: (780) 436-5461
Website: www.cvs-controls.com
Figure 1: CVS Type 657 Actuator
Installation
The CVS Type 657 Diaphragm Actuator is usually
delivered furnished mounted on a CVS Controls
valve body. When installing the valve body into the
pipeline, consult the instructions for that particular
valve body. Should you have any questions during
the installation procedure, consult your CVS
Controls representative.
The loading pressure is connected to the NPT
connection in the top of the diaphragm case (1/4"
for sizes 30 through 60, 1/2" size 70). With larger
sizes, it may be beneficial to reduce the connection
down
E-Mail: info@cvs-controls.com
Calgary Sales Office
3516 114 Avenue SE
Calgary, Alberta, Canada T2Z 3V6
Office: (403) 250-1416
Fax: (403) 291-9487
1
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Related Manuals for CVS Controls Ltd. 657
Summary of Contents for CVS Controls Ltd. 657
- Page 1 Installation (Figure 2). The CVS Type 657 Diaphragm Actuator is usually The valve plug action of the CVS Type 657 Actuator delivered furnished mounted on a CVS Controls can be set to “push down to close” or “push down to valve body.
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Page 2: Operation And Adjustment
The requirements of your specific application will dictate the spring and diaphragm used in your CVS Type 657 Actuator. When in STEM MOVES UPWARD WITH service, the actuator will create full travel of the... - Page 3 1. The CVS Type 657 Actuator can be assembled in were being tested on the work bench. While In the reverse order of the disassembly instructions.
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Page 4: Cvs Type 657 Actuator Parts List
Serial Number ensure full range of travel as desired. Each CVS Type 657 Actuator has a serial number, stamped on the nameplate. When b. Mounted on Body with “Push Down to corresponding with your CVS Controls Open”... -
Page 5: Cvs Type 657 Actuator
Hex Nut Stem Connector Twin Speed Nut (not shown) Pipe Bushing (Size 70 only) (not shown) * Recommended spare part Figure 4: CVS Type 657 Actuator Assembly Drawing Table 3: Parts List Description Part Number Actuator Spring Consult CVS Controls... - Page 6 CVS Type 657 Actuator Parts List continued Description Part Number Size 30 CVS2E791902202 Sizes 34, 40 CVS2E670002202 Diaphragm Sizes 45, 50 CVS2E859502202 Nitrile Sizes 46, 50 CVS2E859702202 Size 70 CVS2N126902202 Size 30 CVS2E791528992 Sizes 34, 40 CVS2E806028992 Upper Diaphragm Casing...
- Page 7 Table 4: Travel Indicator Scale Part Numbers Actuator Size 3/4” Travel 1-1/8” Travel 1’1/2” Travel 2” Travel 3” Travel 30, 34 CVS1E793638992 40, 45, 46 CVS1E808138992 CVS1E808228992 CVS1E808338992 CVS1R444538982 50, 60 CVS1E833138992 CVS1E833128992 CVS1E833338992 CVS1E833428992 CVS1E833138992 CVS1E833238992 CVS1E833338992 CVS1E833438992 1N129838992 Table 5: Thrust Capabilities by Input Signal Range Pressure Range to...
- Page 8 Head Office Calgary Sales Office 3516 114 Avenue SE 3900 – 101 Street Edmonton, Alberta, Canada T6E 0A5 Calgary, Alberta, Canada T2Z 3V6 Office: (780) 437-3055 Office: (403) 250-1416 Fax: (780) 436-5461 Fax: (403) 291-9487 Website: www.cvs-controls.com E-Mail: info@cvs-controls.com Rev 2 12/05 Printed in Canada...
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