CVS Controls 128PQC Series User manual

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 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 (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: [phone]
Fax: [phone]
Website: www.cvs-controls.com E-Mail: [email protected]
Calgary Sales Office
3516 114 Avenue SE
Calgary, Alberta, Canada T2Z 3V6
Office: [phone]
Fax: [phone]

2
Description continued,
Any process leakage passing through the
packing is permitted to escape through a leakoff
vent which passes through the packing box and
out the valve body. This prevents any leakage
from passing along the stem into the actuator
and also prevents loading pressure leakage
from the lower diaphragm from reaching the
valve body through the stem.
Table 1: Specifications
Factory-set specifications for your individual CVS 128PQC Control Valve are stamped on the
nameplate, located on the upper diaphragm casing.
End Connection Style
CVS Type 128 PQC
1-inch NPT Female
Port Diameters
CVS Type
128PQC
Metal Seat
In
1/4, 3/8, 1/2
mm
6.4, 9.5, 12.7
Soft Seat
In
1/4, 3/8, 1/2
mm
6.4, 9.5, 12.7
Maximum Inlet Pressures and
Temperatures**
-20oF to +100oF (-29oC to 38oC)
3600 psig (248 bar)
+150oF (+66oC)
3550 psig (245 bar)
+180oF (+82oC)
3520 psig (243 bar)
Maximum Pressure Drops**
See Table 2
Actuator Operating Pressures
20 psig (1.4 bar) or 35 psig (2.4 bar)
Maximum Actuator Casing
Pressure
100 psig (6.9 bar)
Shutoff Classifications
Metal Seat
ASME Class IV ASME/FCI 70-2-1998 –0.01 percent of
maximum valve capacity using air at a pressure drop of 50 psi
(3.4 bar, differential), at 50oF to 125oF (10oC to 52oC)
Soft Seat
ASME Class IV ASME/FCI 70-2-1998 –Less than one bubble
per minute (0.15 ml) per minute using air at a pressure drop of
50 psi (3.4 bar, differential) at 50oF to 125oF (10oC to 52oC)
Material Temperature
Capabilities
Metal Seat
-20oF to +180oF (-29oC to +82oC)
Soft Seat
-20oF to +150oF (-29oC to +55oC)
Flow Characteristic
Quick opening with 45-degree taper valve plug
Flow Direction
Either direction
Maximum Rated Travel
3/8 inches (10mm)
Actuator Diaphragm Effective
Area
33 inches2 (213 cm2)
Actuator Pressure Connection
1/4-inch NPT Female
Valve Travel Indication
Valve travel is indicated on plastic indicator cover with scale divisions indicated every 25 percent
of travel.
Approximate Weight
CVS Type 128 PQC
17 lb (7.7 kg)
** Pressure and temperature restrictions outlined in this guide, along with any applicable code limitation, should not be exceeded
Warning:
The leakoff vent must be kept open at all
times. Flammable or other hazardous fluids
should be vented into an open, well-ventilated
area to prevent fire or explosion.

3
Installation
Warning:
Service conditions must not exceed the limits
shown on the valve nameplate, or those
outlined in this manual. Consequences could
include bursting of pressure-retaining parts
and uncontrolled process fluid, resulting in
personal injury or property damage. Control
valves should also be protected from external
damages.
Prior to installing the CVS Series 128PQC
Control Valve, perform a complete inspection for
damage, and remove any foreign debris.
Position the valve for desired flow direction. If
angle flow is required, switch the pipe plug to
left-hand connection. (Figure 2)
The versatility of this valve allows for installation
in any orientation, with the standard method
being with the actuator above the body.
Standard orientation is best when an angle body
or angle configuration has been specified.
When installing the valve into the line, accepted
piping practices must be used. A three-valve
bypass should be used if continuous operation
is required during inspection or maintenance.
For a fail-close control valve, connect the input
signal line into the 1/4-inch NPT actuator
connection (Figure 2) in the lower diaphragm
case assembly. The input signal pressure line
should be installed in the upper diaphragm case
assembly of a fail-open control valve.
Figure 2: CVS Type 128PQC Control Valve Typical Constructions
CVS Type 128PQC Control Valve with Fail-Close Action
Detail of CVS Type
128PQC Exterior

4
Maintenance
Warning:
Prior to performing any maintenance, isolate
the valve from the process pressure. Vent
control input signal pressure. Relieve the
process pressure and drain process media
from both sides of valve (Figure 5, Key 27). A
sudden release of pressure or fluid can cause
personal injury or property damage.
Scheduled inspections and maintenance are
vital to continued operation of all pressure
control valves and systems. Parts are subject
to wear and tear, and must be replaced as
necessary, depending on the intensity of service
conditions. Unless the valve body requires
maintenance or replacement, it may remain in
the pressure system or on the vessel.
Table 2: Maximum Allowable Shutoff Pressure Drops
Seating
Actuator
Action
Flowing
Pressure
Drop
Tends
To:
Port
Diameter
Cadmium Coloured Main Spring
CVS14A8831X012
Red Main Spring
CVS14A9077X012
In
mm
At 20 Psig (1.4
bar) Operating
Signal Pressure
(2 Springs Req’d)
At 35 Psig (2.4
bar) Operating
Signal Pressure
(4 Springs Req’d)
At 20 Psig (1.4
bar) Operating
Signal Pressure
(2 Springs Req’d)
At 35 Psig (2.4
bar) Operating
Signal Pressure
(4 Springs Req’d)
Psi
Bar
Psi
Bar
Psi
Bar
Psi
Bar
Metal
(All
Types)
Fail
Close
Open
Valve
1/4
6.4
1510
104
3370
232
3380
233
3600
248
3/8
9.5
520
36
1340
92
1340
92
3120
215
1/2
12.7
220
15
690
47
700
48
1720
118
Close
Valve
1/4
6.4
940
65
1860
128
1370
94
2920
201
3/8
9.5
1130
78
2450
169
1540
106
3300
227
1/2
12.7
1330
92
2920
201
1710
118
3600
248
Fail
Open
Close
Valve
1/4
6.4
170
12
350
24
---
---
---
---
3/8
9.5
530
36
610
42
---
---
---
---
1/2
12.7
540
37
1150
79
---
---
---
---
Soft
Fail
Close
Open
Valve
1/4
6.4
1000
69
1000
69
1000
69
1000
69
3/8
9.5
710
49
1000
69
1000
69
1000
69
1/2
12.7
400
28
830
57
830
57
1000
69
Close
Valve
1/4
6.4
940
65
1000
69
1000
69
1000
69
3/8
9.5
1000
69
1000
69
1000
69
1000
69
1/2
12.7
1000
69
1000
69
1000
69
1000
69
Fail
Open
Close
Valve
1/4
6.4
560
39
660
45
---
---
---
---
3/8
9.5
480
33
960
66
---
---
---
---
1/2
12.7
540
37
1000
69
---
---
---
---
* Contact CVS Controls for pressure drop
Replacing Packing and Trim
Follow these procedures when replacing the
entire packing and trim assembly or individually
replacing packing and trim parts. Unless
otherwise indicated, key numbers in this section
reference Table 3 for parts listings for
replacement packing and trim assembly, Figure
3 for packing and trim assembly key numbers
and Figure 5 control valve assembly key
numbers.
1. Detach the control valve from all pressure,
and release pressure from valve body and
actuator. Ensure the valve is completely
closed.
2. Remove the four nuts (Key 32) from the
screws of the lower diaphragm casing. After
disconnecting the input signal tubing,
remove the actuator from the valve body,
along with attached trim parts.

5
Replacing Packing and Trim continued,
3. Accessible areas should be cleaned at this
stage, and all necessary maintenance
performed. The actuator and attached trim
parts can be turned over and held by the
valve body.
4. To separate trim and access packing parts
or seal O-rings, first loosen and remove the
valve plug (Key 25) and remove the packing
box washer (Key 27).
5. Remove the packing box (Key 28), O-ring
retainer (Key 18), stem O-ring (Key 19) and
diaphragm casing O-ring (Key 31) off the
stem.
6. Install replacement parts as necessary.
6.1. If a complete packing and trim
assembly is being installed, remove the
assembly from the tube (Key 37),
keeping the web sleeve (Key 39) on the
assembly so the parts remain in place.
Roll the sleeve back as necessary
during installation.
6.2. Continue pushing the assembly onto
the stem until the valve plug and cage
are pushed away from the packing box
washer or wiper ring. Roll the web
sleeve back into place just past the
packing box.
6.3. If installing nitrile/cotton packing, the
packing rings may be lubricated with
silicon based product.
7. Slide the packing box onto the stem until the
packing box, the O-ring (Key 19) and the O-
ring retainer (Key 18) and the diaphragm
casing O-ring (Key 31) are sealed against
the diaphragm casing.
7.1. Ensuring proper positioning of the O-
rings will prevent them from being cut
when other parts are compressed
against them.
7.2. Advance the packing spring washer
(Key 29) , packing spring (Key 21),
second packing spring washer, wiper
ring and packing box washer (Key 27, if
included in the assembly) down onto
the stem.
8. For installation of the packing and trim
assembly, it is necessary to remove the
sleeve, cage puller (Key 40) and cage (Key
23) from the valve plug depending on
individual valve configuration.
9. Fix the valve plug onto the stem, rotating the
plug until the shoulder makes snug contact
with the stem. No further tightening is
necessary.
10. To replace the cage or access the cage O-ring
(Key 22), remove the cage from the body (Key
26) using the cage puller or a wire hook.
Replacement parts can be installed as
necessary.
11. Attach the actuator and trim to the valve body
(Key 26), paying special attention to the cage
O-ring to prevent damage. Thread the four
nuts (Key 32) to the lower diaphragm casing
assembly screws. Nuts must be tightened to
15-foot-pounds (20N⚫m).
12. Reconnect the input signal tubing to the
actuator connection of the appropriate
diaphragm casing.
Figure 3: Replacement Packing and Trim
Assemblies for Metal Seated
Constructions

6
Changing Main Spring Range
Unless otherwise indicated, refer to Table 3 for
parts listings for replacement packing and trim
assembly, Figure 3 for packing and trim
assembly key numbers and Figure 5 for control
valve assembly key numbers.
1. Isolate off the control valve from all
pressure, and release pressure from valve
body and actuator.
2. Release pressure and drain the process
media from both sides of the valve body.
Ensure the valve is completely closed.
3. If necessary, disconnect the input signal
tubing; remove the diaphragm casing nuts
(Key 15), cap screws (Key 14) and upper
diaphragm casing (Key 1).
4. For fail-close action applications, install
main springs (Key 12), using quantities and
descriptions as outlined in Table 2.
Note: It is important to avoid loosening the
stem-nut (Key 15), as this may prevent the
valve from shutting off or from fully opening
at full pressure, and resulting in the need for
complete disassembly of the control valve to
properly install the stem and diaphragm.
5. For fail-open applications, unfasten the
locknut (Key 16), remove the flat washer
(Key 33), diaphragm (Key 35), diaphragm
plate (Key 34), spring plate (Key 2), and
main springs (Key 12).
6. Refer to Table 2 and install main springs as
indicated.
7. Reassemble the removed parts (Keys 2, 34,
35, 33, and 16). The locknut (Key 16) must
be tightened to 12 foot-pounds (16 N⚫m).
8. Attach the upper diaphragm casing using
the cap screws, and casing nuts, tightening
in an even crisscross pattern to avoid
crushing the diaphragm. Tighten to 15 foot-
pounds (20 N⚫m).
9. Reconnect the input signal tubing to the
actuator connection of the appropriate
diaphragm casing.
Reversing Action or Replacing Actuator
Parts
Unless otherwise indicated, refer to Table 3 for
parts listings for replacement packing and trim
assembly, Figure 3 for packing and trim
assembly key numbers and Figure 5 for control
valve assembly key numbers.
1. Isolate the control valve from all pressure,
and release pressure from valve body and
actuator and ensure the valve is completely
closed.
2. Remove the input signal tubing, diaphragm
casing nuts (Key 15), cap screws (Key 14)
and upper diaphragm casing (Key 1).
3. Remove the following:
3.1. Main springs (Key 12)
3.2. Stem nut (Key 15)
3.3. Locknut (Key 16) and lock washer (Key
4)
3.4. Spring plate (Key 2)
3.5. Diaphragm plate (Key 34) and
diaphragm (Key 35)
3.6. Flat washer (Key 33)
4. Unscrew the four nuts (Key 32) from the
screws of the lower diaphragm casing. After
disconnecting the input signal tubing,
remove the actuator from the valve body
along with attached trim parts.
5. Remove the following:
5.1. Valve plug (Key 25)
5.2. Packing box washer (Key 27)
5.3. Slide the packing box (Key 28), O-ring
retainer (Key 18), stem O-ring (Key 19)
and the diaphragm casing O-ring (Key
31) off the stem.
6. Replace the valve stem, bottom stem nut or
lock nut (Key 15 or 16) as required.
7. Refer to Figure 4 and ensure that the lower
shoulder of the bottom stem nut (Key 15)
(for fail-open assembly) or locknut (Key 16)
(for fail-close assembly) is the proper
distance from the plug end of the stem.

7
Reversing Action or Replacing Actuator
Parts cont’d
8. Perform the following assembly sequences
as necessary to achieve the required control
valve action:
8.1. Fail–close action: install the following
parts: flat washer (Key 33), diaphragm
(Key 35), diaphragm plate (Key 34),
spring plate (Key 2), lock washer (Key
4) and stem nut (Key 15). Tighten stem
nut to 12 foot-pounds (16 N⚫m).
8.2. Fail-open action, install the following
parts: lock washer (Key 4), spring
plate, diaphragm plate, diaphragm, flat
washer (Key 33) and locknut (Key 16).
Tighten the locknut to 12-foot-pounds
(16 N⚫m).
9. With fail-open application, place the main
springs (Key 12) into the lower diaphragm
casing, ensuring that the lower ends of the
springs rest over the weld stud heads of the
lower diaphragm casing.
10. Following steps 6 through 10 of the
“Replacing Packing and Trim” section, install
packing and trim parts to secure the stem.
11. When reversing action from previous
direction, move the vent (Key 3) to the 1/4-
inch NPT actuator connection of the lower
diaphragm casing (for fail-open action) or
upper diaphragm casing (for fail-close
action).
12. For fail-close application, place the main
springs so that they rest in the spring plate
holes and will not touch the upper
diaphragm casing vent boss.
13. Mount the upper diaphragm casing, cap
screws, and casing nuts, tightening in an
even crisscross pattern to avoid crushing
the diaphragm. Tighten to 15 foot-pounds
(20 N⚫m).
14. Replace the actuator and attached trim parts
into the valve body (Key 26) with nuts (Key
15) to the lower diaphragm casing integral
assembly screws. Tighten nuts to 15 foot-
pounds (20 N⚫m).
15. Reconnect the input signal tubing to the
actuator connection of the appropriate
diaphragm casing.
Parts Ordering
CVS 128-PQC valves have individual serial
numbers, found on the valve nameplate. Please
refer to that number when ordering parts or
contacting your CVS Controls Sales
Representative. Individual parts numbers are
listed as follows. Please include these numbers
when ordering replacement parts.

8
Figure 4: Stem and Diaphragm Assembly Dimensions
Table 3: Replacement Packing and Trim Assembly Part Numbers
Port Diameter
TFE V-Ring Packing and Heat-Treated 440C SST
Valve Plug and Cage
TFE V-Ring Packing, Nitronic 50 SST Valve
Plug and Cage, and Inconel X750 Packing
Spring
In
mm
CVS Type 128PQC
17-7PH SST Packing Spring
CVS Type 128 PQC
1/4
6.5
CVS15A2611X012
CVS15A2611X042
3/8
9.5
CVS15A2611X022
CVS15A2611X052
1/2
12.7
CVS15A2611X032
CVS15A2611X062
Fail-Close Assembly
Fail-Open Assembly
Valve Design
Dimension A
Fail-Open
Fail-Close
In.
mm
In.
mm
CVS 128PQC
2.72
69.1
2.46
62.5

9
Figure 5: Typical CVS Series 128PQC Control Valve Assembly
CVS Type 128PQC Control Valve: Fail-Closed with Cage-Style Metal Seat
and Single TFE-V-Ring Packing
Fail-Open Actuator Detail
CVS Design 128PQC
Cageless Soft-Seat Detail

10
Parts List
Key
Description
Part Number
1
Upper Diaphragm Casing, Steel
CVS24A8816X012
2
Spring Plate, Zinc Plated Steel
CVS14A8819X012
3
Vent Assembly
CVS1C8937000A2
4
Washer, Steel
CVS1A742328992
5
Indicator Bushing, 316 SST
CVS13A2323X012
6
Indicator Cover, Plastic
CVS15A1580X012
7
Travel Indicator Disc Nut, Plastic
CVS1F730506992
8
Machine Screw, SST
CVS14A8818X012
9
Indicator Fitting SST
CVS15A0726X012
10
O-Ring, Nitrile
CVS1H292606992
11
Spring, 302 SST
CVS16A0431X012
12
Main Spring, Cadmium Plated Steel
See Table 2
13
Nameplate, Aluminum
CVS24A7156X012
14
Cap Screw, Plated Steel (2 req’d)
CVS1E760324052
15
Hex Nut, Cadmium Plated Steel (17 req’d)
CVS1A346524122
16
Locknut, Plated Steel
CVS15A7591X012
17
Lower Diaphragm Casing, Steel
CVS24A8810X012
18
O-Ring Retainer, Polyethylene
CVS Type 128PQC
CVS14A9053X012
19
O-Ring, Nitrile
CVS Type 128PQC
CVS1P420706992
20
O-Ring, Viton
CVS Type 128PQC
CVS1U841806382
21
Spring
CVS Type 128PQC
Inconel X750
CVS15A1809X012
22
O-Ring, Nitrile
CVS Type 128PQC
CVS11A8741X012
23
Cage
316 SST
CVS Type 128PQC
1/4” (6.4 mm)
CVS14A8823X022
3/8” (9.5 mm)
CVS14A8805X022
1/2” (12.7 mm)
CVS14A7157X022
Austenitic SST w/
Tungsten
Carbide Seating
Surface
CVS Type 128PQC
1/4” (6.4 mm)
CVS15A6800X012
3/8” (9.5 mm)
CVS15A6801X012
24
Pipe Plug, Steel
CVS1A794728992
25
Valve Plug
Metal Seat
CVS Type 128 PQC
1” Body
1/4” (6.4
mm) and
3/8” (9.5
mm) port
316 SST
CVS16A2087X012
Austenitic SST w/
Tungsten Carbide
Seating Surface
CVS15A6804X012
1/2” (12.7
mm) port
316 SST
CVS14A6618X012
Composition
Seat, Austenitic
SST/polyethylene
CVS Type 128 PQC
1” Body
1/4” (6.4 mm) through 1/2” (12.7 mm)
port
CVS15A3199X012
Valve Plug Stem, 316 SST
1” Body, CVS Type 128PQC
CVS14A8806X012
26
Valve Body, WCB Steel
1” NPT, CVS Type 128PQC
CVS24A8802X012
27
Packing Box Washer, SST
1/2” (12.7 mm) or smaller port
CVS14A6617X012
28
Packing Box, SST
CVS Type 128PQC
CVS14A8809X012
29
Washer, SST (2 req’d)
CVS Type 128PQC
CVS14A8808X012
30
Packing Set,
TFE
CVS Type
128PQC
Complete Set
CVS14A8812X012
Individual Parts
Male Adaptor
CVS1J227206242
V-Ring (4 req’d)
CVS1J255206992
Female Adaptor
CVS1J233201012
Wiper Ring
CVS1R2516X0012
31
O-Ring, Nitrile
CVS13A1584X012
33
Washer, Cadmium Plated Steel
CVS14A9770X012
34
Diaphragm Plate, Zinc Plated Steel
CVS14A8814X012
35
Diaphragm, Neoprene w/nitrile insert
CVS14A8813X012
37
Paper Tube
---
38
Paper Label
---
39
Protective Sleeve-Web
---
40
Cage Puller
CVS15A2525X012
Keys 5, 7, 8, 9, 10, 11
Complete Assembly
CVS35A1588X0A2

11
PRODUCT BULLETIN –CVS 128PQC
VALVE
SIZE
PORT
DIAMETER
MAXIMUM
TRAVEL
QUICK OPENING
Valve Opening—
Percent of Total Travel
mm
Inches
mm
Inches
10
30
70
100
10
30
70
100
10
30
70
100
100
Kv
Cv
XT
FL
Globe Valve—Flow Up
1
6.35
9.53
12.7
1/4
3/8
1/2
9.5
9.5
9.5
3/8
3/8
3/8
.566
.828
1.02
1.14
2.02
2.71
1.38
2.60
3.88
1.38
2.60
3.88
.654
.957
1.18
1.32
2.33
3.13
1.60
3.01
4.49
1.60
3.01
4.49
.539
.578
.614
.694
.699
.677
.539
.746
.803
.539
.746
.824
.77
.82
.91
Globe Valve—Flow Down
1
6.35
9.53
12.7
1/4
3/8
1/2
9.5
9.5
9.5
3/8
3/8
3/8
.616
.91
1.12
1.28
2.23
2.80
1.38
2.71
3.58
1.38
2.71
3.65
.712
1.05
1.30
1.48
2.58
3.24
1.60
3.13
4.14
1.60
3.13
4.22
.575
.559
.512
.601
.613
.607
.567
.717
.899
.567
.717
.887
.82
.87
.91
Angle Valve—Flow Up
1
6.35
9.53
12.7
1/4
3/8
1/2
9.5
9.5
9.5
3/8
3/8
3/8
.699
.943
1.08
1.22
2.14
2.77
1.38
2.98
4.61
1.38
2.98
4.84
.808
1.09
1.25
1.41
2.47
3.20
1.60
3.44
5.33
1.60
3.44
5.59
.398
.433
.510
.706
.636
.660
.553
.605
.674
.553
.605
.663
.77
.76
.90
Angle Valve—Flow Down
1
6.35
9.53
12.7
1/4
3/8
1/2
9.5
9.5
9.5
3/8
3/8
3/8
.676
.798
1.18
1.36
2.33
3.10
1.46
3.16
4.40
1.46
3.16
4.40
.782
.923
1.36
1.57
2.69
3.58
1.69
3.65
5.09
1.69
3.65
5.09
.397
.515
.414
.520
.495
.469
.500
.507
.602
.500
.507
.602
.77
.77
.78
Flow Coefficients
Dimensions - Inches

12
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April 2019