CVS Controls 667 User manual
1
Instruction Manual
CVSType667
Diaphragm
Actuator
Sizes 30-70
All CVS Controls actuators are to be installed and
maintained in accordance with instructions supplied
by CVS Controls.
This manual includes information on installing,
maintaining and adjusting the CVS Type 667
Actuator, sizes 30 to 70. Part numbers for the entire
assembly is also included. For information on other
equipment used with these actuators, consult the
appropriate manuals.
Introduction
The CVS 667 is a reverse-acting, spring-opposed
diaphragm actuators providing 3-inches (76 mm) of
maximum travel. Although typical pressure ranges
are 3 to 15 psi or 6 to 30 psi, additional pressure
ranges are available upon request. The CVS Type
667 Actuator is used for automatic operation of
control valves, effective in applications where
throttling or on/off service is required.
The actuator positions the valve plug in the valve in
direct response to the varying loading pressure on
the actuator diaphragm. When the signal pressure
increases to the lower diaphragm casing, the
actuator stem is forced upward, compressing the
spring. When the signal pressure is reduced, the
spring moves the actuator stem in the downward
direction. If the signal pressure should fail, the
spring will force the stem downward, providing “fail-
closed action” for “push down to close” valves.
Head Office
3900 –101 Street
Edmonton, Alberta, Canada T6E 0A5
Office: (780) 437-3055
Fax: (780) 436-5461
Figure 1: CVS Type 667 Actuator
Specifications
Refer to Table 1 for specifications for the CVS Type
667 Actuator, and to the nameplate on your actuator
for settings specific to your equipment.
It is important not to exceed the Maximum
Diaphragm Pressure as listed in Table 1 when the
actuator is set at less than full travel. If this pressure
is exceeded before the travel stop comes in contact
with the upper diaphragm plate, the maximum
allowable valve stem load may be exceeded.
The Maximum Excess Diaphragm Pressure as listed
in Table 1 is the pressure that can be added when
the actuator is set at full travel. The sum of the
pressure which is required to fully stroke the valve
and the excess pressure added when the actuator is
against the stop must not exceed the “Maximum
Diaphragm Casing Pressure” as outlined in Table 1.
Calgary Sales Office
3516 –114 Avenue SE
Calgary, Alberta, Canada T2Z 3V6
Office: (403) 250-1416
Fax: (403) 291-9487
Website: www.cvs-controls.com E-Mail: info@cvs-controls.com
2
Table 1: CVS Type 667 Diaphragm Actuator Specifications
Specification
Actuator Size
30
34
40
45
46
50
60
70
Nominal Effective Area
Sq. In.
46
69
69
105
156
105
156
220
Sq. cm
297
445
445
677
1006
677
1006
1419
Yoke Boss Size Diameter
In.
2-1/8
2-1/8
2-13/16
2-13/16
2-13/16
3-9/16
3-9/16
3-9/16
mm
54
54
71
71
71
90
90
90
Valve Stem Size
In.
3/8
3/8
1/2
1/2
1/2
3/4
3/4
3/4
mm
9.5
9.5
12.7
12.7
12.7
19.1
19.1
19.1
Max. Allowable Output
Thrust
Lbs
2300
2300
2700
5650
7550
5650
6800
8800
N
10,230
10,230
12,010
25,131
33,582
25,131
30,246
39,142
Maximum
Travel2
Standard
In.
3/4
3/4
1-1/2
2
2
2
2
3
mm
19
19
38
51
51
51
51
76
Top-Loaded
In.
---
3/4
---
3/4
---
---
1-1/8
---
mm
---
19
---
19
---
---
29
---
Max. Diaphragm Pressure to
StrokeActuator
Psig
40
45
45
50
45
50
45
40
Bar
2.8
3.1
3.1
3.4
3.1
3.4
3.1
2.8
Max. Excess Diaphragm
Pressure
Psig
70
45
45
30
15
30
15
15
Bar
4.8
3.1
3.1
2.1
1.0
2.1
1.0
1.0
Max. Diaphragm Case
Pressure1
Psig
110
90
90
65
55
65
55
55
Bar
7.6
6.2
6.2
4.5
3.8
4.5
3.8
3.8
ApproximateWeight
Lb
40
60
56
95
125
97
125
254
Kg
18
27
25
43
57
44
57
115
1. Maximum diaphragm casing pressure must not be exceeded,and must not produce a force on the actuator stem greater than the maximum allowable actuator output thrust
or the maximum allowable valve stem load.
2. Actuator travel may be less than the value specified after being connected to the valve.
Installation
The CVS Type 667 Diaphragm Actuator is usually
delivered 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.
Actuator Mounting
1. Install the stem locknuts onto the valve stem and
place the travel indicator disc onto the locknuts.
2. If the valve is direct-acting, push the valve stem
down to close the valve. If the valve is reverse-
acting, push the valve stem down to open the
valve.
3. Place the actuator onto the valve bonnet. If
necessary, use a hoist or lift the actuator in order
to slip the yoke locknut over the valve stem.
4. Screw the yoke locknut onto the bonnet securing
the actuator to the bonnet.
5. Apply required supply pressure to actuator. If
using a 6-30 signal, apply 35 psi. If using a 3-15
signal, apply 20 psi to move the actuator stem to
the top of the travel.
6. Align the indicator disc with the travel side on the
actuator by adjusting the locknuts.
7. Raise the valve plug until the travel disc aligns
with the top of the scale (full travel).
8. Clamp the actuator and valve body stems
between the two stem connector halves. Insert
and tighten both stem connector cap screws.
Note: Avoid clamping the tip of either the valve
stem or the actuator stem in the stem connector.
Failure to completely clamp the stems may strip
the threads and affect proper operation. The
length of each stem clamped in the stem
connector should be equal to or greater than the
diameter of that stem.
9. Lift the travel indicator disc to the stem connector
and thread the stem locknuts against the stem
connector.
10. Realign the travel indicator scale to show the
valve position.
Loading Connection
1. The loading pressure is connected to the 1/4-
inch NPT connection in the side of the yoke.
2. For the CVS 667 Actuator Size 70, remove the
1/4-inch bushing in the 1/2-inch NPT female
connection to increase the connection size if
desired. Piping or tubing can be used, but should
be kept as short as possible to avoid
transmission lag in the control signal. If an
accessory is attached to the actuator ensure that
it has been properly secured.
3. If the valve positioner is provided as part of the
original equipment, the loading pressure
connection will be made at the CVS Controls
manufacturing facility.
4. Check the valve stem travel by cycling the
actuator several times. Ensure that the proper
travel occurs when the correct pressure range is
applied to the diaphragm.
3
1. Loosen and back off the stem locknuts and
indicator disc from the stem connector.
2. Loosen the stem connector cap screws.
AIR
LIFTS
SPRING
PUSHES
Note: Do not use wrenches or other tools
directly on the valve stem as this could cause
damage to the stem surface and valve packing.
STEM UP DOWN
STEM SEAL
STEM
Figure 2: Schematic of CVS Type 667 Actuator
Loading Connection cont’d
5. If the valve stem travel or pressure range is
incorrect, refer to the “Adjustments” section of
this manual.
Do not place the valve in service if it is not
responding properly to diaphragm loading pressure
changes.
For ease of service, ensure that the control valve is
located for easy access and serviceability with room
above for accessibility. Ensure that sufficient room is
provided below should removal of the actuator and
valve plug be necessary.
Adjustments
Travel
Refer to the nameplate on the yoke of the actuator
for details on the specific construction and operating
range of the control valve assembly.
The requirements of your specific application will
dictate the spring and diaphragm used in your CVS
Type 667 Actuator, and when in service, the actuator
should create full travel of the valve plug when
diaphragm pressure is applied according to the
range indicated on the name plate. Generally, the
diaphragm pressure range is 3 to 15 PSI or 6 to 30
PSI, but other ranges may be used.
If the motion during the actuator travel differs from
the travel stamped on the actuator nameplate, adjust
according to the following directions. In order to
adjust the travel of a direct-acting valve, slightly
pressure the actuator to move the valve plug off of
the seat. This reduces the chance of damaging the
valve plug or seat during adjustments.
3. Tighten the locknuts (Keys 14 and 20) and
complete the adjustment by either screwing the
valve stem into the stem connector to lengthen
travel or out of the stem connector to shorten
travel.
4. Cycle the actuator to ensure that the correct
travel has been achieved and repeat the
adjustment if necessary.
5. When the correct travel has been reached
tighten the stem connector cap screws.
6. Raise the travel indicator disc by threading the
stem locknuts against the stem connector.
7. Adjust the travel scale to match the disc.
Spring
If the loading pressure range applied to reach the
desired travel differs from that specified on the
nameplate, a spring adjustment is required.
Check the “Bench Set” pressure range on the
nameplate when the valve contains no pressure and
the packing is loosely inserted in the bonnet. Refer
to the “Diaphragm Pressure” range on the nameplate
when the valve is controlling the specified pressure
drop and the packing is tightened to stop leaks
around the stem.
1. Monitor the loading pressure while making
adjustments. Be sure not to exceed the
pressure specifications of either the loading
regulator or the actuator casings.
2. Each actuator spring has a fixed pressure span.
Changing the spring compression shifts the span
up or down to make the valve travel coincide
with the loading pressure range.
Figure 3: Nameplate on CVS Type 667 Actuator
4
Spring Adjustments cont’d
3. To shift the span up, turn the spring adjustor
(Key 11) into the yoke. To shift the span down,
turn the spring adjustor out of the yoke.
For operation of the CVS 667 Diaphragm Actuator
the actuator stem and valve plug stem must move
freely in response to the loading pressure change on
the diaphragm.
Maintenance
Actuator parts are subject to normal wear and tear
and should be inspected regularly. The frequency of
inspection and replacement of parts is dependent on
the severity of operating conditions.
WARNING
A sudden release of pressure or any
uncontrolled process fluid can cause
personal injury or damage to property. Prior
to any disassembly, be sure to:
•
Isolate the valve from the process,
•
Release all process pressure
•
Vent the actuator loading pressure, and
•
Relieve all spring compression.
Disassembly
Although the following instructions describe how the
CVS Type 667 Diaphragm Actuator can be
completely disassembled, when inspection or repairs
are required, only disassemble those parts required
to accomplish the job. Key numbers refer to Figures
4 and 5.
1. Bypass the control valve and reduce the loading
pressure to atmospheric.
2. Remove the tubing or piping from the connection
in the top of the yoke (Key 9). For top-loaded
construction also remove the piping or tubing
from the connection in the upper diaphragm
casing (Key 7).
3. Thread the spring adjustor (Key 2) off the stem
(Key 3) to remove all spring compression.
4. If necessary remove the actuator from the valve
body by separating the stem connector (Key 21)
and removing the yoke locknut.
5. Remove the spring adjustor (Key 2) from the
actuator stem (Key 3) and lift the spring seat and
spring (Keys 4 and 1) out of the yoke.
6. Remove the diaphragm casing cap screws and
nuts (Keys 10 and 14) and lift off the upper
diaphragm casing (Key 7).
7. Remove the following parts: diaphragm (Key 6),
diaphragm plate (Key 5), spacer (Key 32), cap
screw (Key 11) and actuator stem (Key 3). Be
careful not to damage the O-rings (Key 25) when
pulling the threads of the actuator stem through
the seal bushing (Key 24). Remove the stem
through the housing of the yoke so as not to pull
the threads through the seal bushing.
8. Separate the parts of this assembly by removing
the cap screw (Key 11).
9. To remove the seal bushing, remove the snap
ring (Key 30) and lift out the bushing.
10. Remove the cap screws (Key 19), the lower
diaphragm casing (Key 8) and the gasket (sizes
30 through 60) or O-ring (size 70) (Key 28).
11. If necessary, the down travel stops can be
removed (Key 33).
Assembly
1. Place a new gasket or O-ring (Key 28) on the
yoke (Key 9) and apply lubricant to the O-ring.
2. Position the lower diaphragm casing (Key 8) on
the yoke, align the holes and insert and tighten
the cap screws (Key 19).
3. If the down travel stops (Key 33) were removed,
insert and tighten them.
4. Coat the O-rings (Keys 28 and 29) with lubricant
and place them in the seal bushing (24).
5. Fill the seal bushing with lubricant, slide the
bushing into the yoke (Key 9) and install the
snap ring (Key 30).
6. Insert the actuator stem (Key 3) through the
spring housing of the yoke, then add the lower
diaphragm plate (Key 29), diaphragm (Key 6),
diaphragm plate (Key 5), and the travel stop cap
screw and spacer (Keys 11 and 32).
7. Place this assembly in the actuator, being careful
when pushing the actuator stem through the seal
bushing that the threads do not damage the O-
rings.
Note: Over tightening the diaphragm cap
screws and nuts can damage the diaphragm.
Do not exceed 20 foot-pounds (27 Newton
meters) torque.
8. Install the upper diaphragm casing (Key 7) and
secure with cap screws and nuts (Keys 10 and
14). Tighten evenly using a crisscross pattern to
ensure a proper seal.
9. Install the actuator spring (Key 1) and spring
seat (Key 4). Apply lubricant to the threads of
the actuator stem and to the surface of the
spring adjustor (Key 2) that contacts the spring
seat. Thread the spring adjustor onto the
actuator stem.
10. Mount the actuator onto the valve, following
procedures in the “Installation” section of this
manual.
5
Key
Part Name
12
TravelIndicator
13
Hex Nut
14
Hex Jam Nut
15
Self-TappingScrew
16
Travel Indicator Scale
17
Nameplate
18
Drive Screw
19
Bolt
20
Hex Nut
21
Stem Connector
22
Twin Speed Nut (not shown)
Key
Part Name
23
Pipe Bushing (Size 70 only)
(not shown)
24
Seal Bushing
25
O-Ring
26
O-Ring
27
Vent assembly
28
Gasket / O-Ring
29
Lower Diaphragm Plate
30
Snap Ring
31
Washer
32
Spacer
33
Down Stop
CVS Type 667 Actuator Parts List
The following parts list includes complete part numbers for components of the CVS Type 667 Actuator that are
generally replaceable in the field, and are most commonly used. Key numbers correspond to those in Figures
4 and 5. Include the serial number of your actuator in all correspondence regarding replacement parts.
Figure 4: CVS Type 667 Actuator, Sizes 30 through 60
Table 2: Parts Reference
Key
Part Name
1
ActuatorSpring
2
SpringAdjuster
3
ActuatorStem
4
Spring Seat
5
Diaphragm Plate
6*
Diaphragm
7
Upper Diaphragm Case
8
Lower Diaphragm Case
9
Yoke
10
Bolt
11
Cap Screw
* Recommended spare part
6
OPE
N
Figure 5: CVS Type 667 Actuator, Size 70
LUBRICATE
Table 3: Parts List
Key
Description
Part Number
1
ActuatorSpring
Consult CVS Controls
2
Spring Adjustor
Size 30
CVS1E801724102
Sizes 34, 40
CVS1E821024102
Sizes 45, 46, 50, 60
CVS1E846224102
Size 70
CVS1N131824102
3
Actuator Stem
Steel, CD PL
Size 30
CVS1E801624222
Size 34
CVS1E884724222
Size 40
CVS1E820924222
Sizes 45, 46
CVS1J332824222
Sizes 50, 60
CVS1E846124222
Size 70
CVS2N131724222
4
Spring Seat
Size 30, Steel
CVS1U425623122
Sizes 34,40, Steel
CVS1R179923122
Sizes 45, 46, 50, 60, Steel
CVS1R180023122
Size 70
Cast Iron
CVS1N129619052
Steel
CVS1N757722012
5
Diaphragm Plate
Size 30, Aluminum
CVS30A2880X012
Sizes 34,40, Cast Iron
CVS3E880519042
Sizes 45, 50, Aluminum
CVS30A2882X012
Sizes 46, 60, Cast Iron
CVS2E847519042
Size 70, Cast Iron
CVS2N127019042
6
Diaphragm
Nitrile
Size 30
CVS2E800002202
Sizes 34, 40
CVS2E669902202
Sizes 45, 50
CVS2E859602202
Sizes 46, 50
CVS2E859802202
Size 70
CVS2N130902202
7
Upper Diaphragm Casing
Steel
Size 30
CVS2E800728992
Sizes 34, 40
CVS2E681428992
Sizes 45, 50
CVS3E844628992
Sizes 46, 60
CVS3E846728992
Size 70
CVS2N127828992
7
Table 3: Parts List
Key
Description
Part Number
8
Lower Diaphragm Casing
Steel
Size 30
CVS2E801125062
Sizes 34, 40
CVS2E682625062
Sizes 45, 50
CVS3E845325062
Sizes 46, 60
CVS3E847725062
Size 70
CVS2N131025062
9
Yoke
Cast Iron
Size 30
CVS3E801419042
Size 34
CVS2E884619042
Size 40
CVS3E820819042
Sizes 45, 46
CVS3E900819042
Sizes 50, 60
CVS3E845919042
Size 70
CVS3N130319042
10
Cap Screw
Steel, CD PL
Size 30 (12 req’d)
CVS1E760324052
Sizes 34, 40 (16 req’d)
CVS1E760324052
Sizes 45, 50 (20 req’d)
CVS1A675124052
Size 46, 60 (24 req’d)
CVS1A675124052
Size 70 (28 req’d)
CVS1A582824052
11
Cap Screw
See Following Table
12
Travel Indicator, SST
Sizes 30, 34
CVS1E793138992
Sizes 40, 45, 46
CVS1E807538992
Sizes 50, 60
CVS1E832838992
Size 70
CVS1B971838992
13
Hex Nut, SST (Refer to Key 10 for quantities)
CVS1A346524122
14
Hex Jam Nut, CD PL
Sizes 30, 34 (2 req’d)
CVS1P131224142
Size 40 (1 req’d)
CVS1A413224122
Size 45 (None req’d)
---
Size 46 (1 req’d)
CVA1A413224122
Sizes 50, 60, 70 (1 req’d)
CVS1A375424122
15
Self-tappingScrew, SST
Sizes 30, 34, 40, 45, 46 (2 req’d)
CVS1E793238992
Sizes 50, 60, 70 (2 req’d)
CVS1E831338992
16
Travel Indicator Scale, SST
See Following Table
17
Nameplate,SST
CVS1K325738992
18
Drive Screw, SST (4 req’d)
CVS1A368228982
19
Cap Screw CD PL
Size 30 (6 req’d)
CVS1D529824052
Sizes 34, 40 (6 req’d)
CVS1A368424052
Sizes 45, 46, 50, 60 (8 req’d)
CVS1A368424052
Size 70 (12 req’d)
CVS1N129328992
20
Hex Nut CD PL
Sizes 30, 34 (None req’d)
---
Size 40 (1 req’d)
CVS1A353724122
Size 45 (2 req’d)
CVS1A353724122
Size 46 (1 req’d)
CVS1A353724122
Sizes 50, 60, 70 (1 req’d)
CVS1A351124122
21
Stem Connector, SST
Sizes 30, 34
CVS1E7977000A2
Size 40
CVS1E8033000A2
Sizes 45, 46
CVS1J3330000A2
Sizes 50, 60
CVS1E8337000A2
Size 70
CVS1N1319000A2
22
Twin Speed Nut, SST
Sizes 30, 34
CVS1E793938992
Sizes 40, 45, 46
CVS1E808438992
Sizes 50, 60, 70
CVS1E833538992
23
Pipe Bushing, CD PL
Size 70
CVS1C379026232
24
Seal Bushing, Brass
Size 30
CVS1E791214012
Sizes 34, 40
CVS1E682814012
Sizes 45 to 60
CVS1E845714012
Size 70
CVS1N131614012
25
O-Ring, Nitrile
(2 req’d)
Size 30
CVS1E591406992
Sizes 34, 40
CVS1D237506992
Sizes 45 to 60
CVS1C562206992
Size 70
CVS1E736906992
26
O-Ring, Nitrile
Sizes 30, 34, 40
CVS1C415706992
Sizes 45, 46, 50, 60, 70
CVS1E845806992
27
Vent Assembly
CVSY602X1A11
28
Gasket,Garlock
Sizes 30, 34, 40
CVS1E801204022
Sizes 45, 46, 50, 60
CVS1E845404022
O-Ring, Nitrile
Size 70
CVS1D269106992
8
Table 3: Parts List
Key
Description
Part Number
29
Lower Diaphragm Plate
Size 30, Aluminum
CVS1E791344022
Sizes 34, 40, Aluminum
CVS1E682744022
Sizes 45, 46, 50, 60, Aluminum
CVS1E845544022
Size 70, Steel
CVS1N131524092
30
Snap Ring, SST
Sizes 30, 34, 40
CVS1E801337022
Sizes 45 to 70
CVS1E845638992
31
Washer (2 req’d)
Size 70, Steel
CVS1E873028992
32
Spacer, Steel
See Following Table
33
Down Stop, Steel
Sizes 30 to 40
CVS1H493524092
Sizes 45 to 60
CVS1H494324092
Key 11 Cap Screw, Steel
Key 32 Spacer, Steel
Actuator Size
Key
Travel In (mm)
7/16 (11)
5/8 (16)
3/4 (19)
1-1/8 (29)
30
11
CVS1A685724052
CVS1A685724052
CVS1B227524052
---
32
CVS1R408724092
CVS1R408624092
CVS1R408524092
---
34
11
CVS1R408828992
CVS1R408928992
CVS1R408928992
---
32
CVS1R409324092
CVS1R409424092
CVS1R409524092
---
40
11
CVS1R408828992
CVS1R408828992
CVS1R408928992
CVS1R409128992
32
CVS1R409324092
CVS1R409424092
CVS1R409524092
CVS1R409624092
45, 46, 50, 60
11
CVS1R409824052
CVS1R409824052
CVS1R409824052
CVS1R409924052
32
CVS1R410324092
CVS1R410424092
CVS1R410524092
CVS1R410824092
70
11
---
---
CVS1R411024052
CVS1R411524092
32
---
---
CVS1R411624092
CVS1R411124052
Actuator Size
Key
Travel In (mm)
1-1/2(38)
2 (51)
3 (76)
30
11
---
---
---
32
---
---
---
34
11
---
---
---
32
---
---
---
40
11
CVS1R409228992
---
---
32
CVS1R409724092
---
---
45, 46, 50, 60
11
CVS1R410124052
CVS1R410224052
---
32
CVS1R410624092
CVS1R410724092
---
70
11
CVS1R409824052
CVS1R409924092
CVS1R410224052
32
CVS1R411424092
CVS1R411324052
CVS1R410724092
Key 16 Travel Indicator Scale
Actuator Size
Travel In (mm)
7/16 (11)
5/8 (16)
3/4 (19)
1-1/8 (29)
30
CVS1E793438992
CVS1E793538992
CVS1E793638992
---
34
CVS1E793438992
CVS1E793538992
CVS1E793638992
---
40, 45, 46
CVS1E807638992
CVS1E807738992
CVS1E808138992
CVS1E808238992
50
CVS1E833038982
CVS1E833038992
CVS1E833138992
CVS1E833238992
60
CVS1F535238982
CVS1E833038992
CVS1E833138992
CVS1E833238992
70
---
---
CVS1H745738992
CVS1H745838992
Actuator Size
Travel In (mm)
1-1/2(38)
2 (51)
3 (76)
30
---
---
---
34
---
---
---
40, 45, 46
CVS1E803838992
CVS1R444538982
---
50
CVS1E833338992
CVS1E833438992
---
60
CVS1E833338992
CVS1E833438992
---
70
CVS1H745938992
CVS1H746038992
CVS1H746138992
April 2019
Table of contents
Other CVS Controls Controllers manuals
