The Series CVA combines a pneumatic actuator and a fast on-off
control valve into one body. This design eliminates packing glands,
actuators, and mounting kits, giving the CVA Series a highly compact
body, at a competitive price. The body is made of Nickel Plated Brass,
while the seals can be Fluoroelastomer, EPDM, or Buna-N. The various
seal types allow for the CVA Series to be suitable for many applications.
Fluoroelastomer seals are suitable for most liquids. The EPDM seal
can be used with steam and hot water. For air, gas, and oil at low
temperatures, the BUNA-N seals should be used. NAMUR mounting
pads allow direct mounting of solenoid valves.
W.E. ANDERSON DIV., DWYER
INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U. S. A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: info@dwyermail.com
INSTALLATION
Before installing the CVA valve, make sure that all tubes are free from
dirt or welding residues to prevent damaging the seat seals. The valve
must not be affected by tube expansions. Standard sealing means
(such as PTFE, hemp, etc.) must be used on threads.
IMPORTANT: Only use a wrench on the hexagon flats! Using a wrench
on any other part may damage the valve, and cause it to function
improperly.
Arrangements for Accessories:
The CVA valve has been designed to be connected to a pneumatic
control network through 1/8˝ connections for NAMUR solenoid valves.
Magnetic limit switches may be mounted on the valve. They are
supplied with their mounting kit for quick and easy installation.
Series CVA Compact Valve and Actuator
Specifications - Installation & Operating Instructions
Bulletin V-23
®
SPECIFICATIONS
Body: 1-piece.
Line Size: 3/8˝ to 2˝.
End Connections: NPT female (3/8˝ to 2˝).
Pressure Limit: 150 psig (10.3 bar).
Wetted Materials: Body: Nickel Plated Brass.
Seals: Buna-N, Fluoroelastomer or EPDM.
Temperature Limit: Buna-N (NBR) seals: -4 to 176°F (-20 to 80°C);
Fluoroelastomer seals: -4 to 302°F (-20 to 150°C); EPDM seals: -4 to
302°F (-20 to 150°C).
ACTUATORS
Pneumatic
Type: DA is double acting and SR is spring return.
Normal Supply Pressure:43.5 psig (3 bar) for double acting;
61 psig (4.2 bar) for spring return.
Maximum Supply Pressure: 116 psig (8 bar) for double acting;
116 psig (8 bar) for spring return.
Air Connections: 1/8˝ NPT.
Air Consumption: 3/8˝: 0.73 cu. in.; 1/2˝: 1.05 cu. in.; 3/4˝: 1.90 cu.
in.; 1˝: 2.45 cu. in.; 1-1/4˝: 4.58 cu. in.; 1-1/2˝: 6.70 cu. in.; 2˝: 12.75
cu. in.
Stroke Time: DA01 & DA02: .01 sec; DA03 & DA04: .02 sec; DA05:
.03 sec; DA06: .06 sec; DA07: .07 sec.(spring stroke) NC01 & NC02:
.02 sec; NC03: .03 sec; NC04 .04 sec; NC05: .07 sec; NC06: .11 sec;
NC07: .13 sec. (air stroke) NC01 & NC02: .01 sec; NC03 & NC04 .02
sec; NC05: .04 sec; NC06: .06 sec; NC07: .07 sec. NO same as NC.
Accessory Mounting: NAMUR.
Note: For optimal operation, CVA valves should be run with dry,
filtered compressed air, not necessarily lubricated.
C
Ø
B
E
A
2x 1/8 NPT PORTS
4x 10-24 UNC-2B
NAMUR INTERFACE
S
IZE
3
/8˝
(9.53 mm)
1/2˝
(12.7 mm)
3
/4˝
(
19.05 mm)
1
˝
(
25.4 mm)
1-1/4˝
(31.75 mm)
1-1/2˝
(
38.1 mm)
2
˝
(
50.8 mm)
A
2
-7/32
[56.36]
2-15/64
[56.76]
2
-9/32
[
57.94]
3
[
76.2]
3-19/32
[91.28]
4
[
101.6]
4
-1/2
[
114.3]
B
1
-3/16
[30.16]
2
[50.8]
2
-7/64
[
53.58]
2
-47/64
[
69.45]
3-11/32
[84.93]
3-25/32
[
96.04]
4
-19/64
[
190.14]
C
3-3/8
[
85.73]
4
-7/32
[
107.16]
4
-59/64
[125.02]
5-5/16
[134.94]
6
-1/32
[
153.19]
6
-47/64
[171.05]
7-33/64
[190.9]
D
1-7/32
[
30.96]
1
-5/16
[
33.34]
1
-33/64
[38.5]
1-41/64
[41.67]
1
-29/32
[
48.42]
2
-1/8
[53.98]
2-23/64
[59.93]
Double Acting
Air to port B (the right hand port) causes the piston to open the valve.
Air to port A (the left hand port) causes the piston to close the valve.
Spring Return Actuators
Normally Open: Air to port A (the left hand port) causes the piston to
close the valve. Loss of air to port A causes the air to exhaust and the
piston returns to the open position.
Normally Closed: Air to port B (the right hand port) causes the piston
to open the valve. Loss of air to port B causes the air to exhaust and
the piston returns to the closed position.
IMPORTANT
1. Check the nature of the fluid flowing into the CVA valve since it might
be corrosive, toxic, inflammable, polluting, or dangerous.
2. Before disassembling the CVA valve, make sure that the air, and the
electrical supplies are completely disconnected, both up and down the
valve. All taps next to the CVA valve should be kept closed during
maintenance procedures.
3. Before handling the CVA valve, take the following safety precautions:
• Put on a pair of protective glasses or a safety visor
• Put on a pair of gloves, an overall, and safety helmet
• Make sure that running water is at hand
• Make sure that a fire extinguisher is at hand. If the fluid is
inflammable, the extinguisher will have to be suitable for it.
Disassembling The CVA Valve
1. Unscrew the sleeve (part 7). With Normally Open, or Normally
Closed executions, pay attention to the pressure of the springs (part 5).
2. Remove the piston (part 2) and all of the seals; clean everything
carefully, and replace the parts. If you want to replace the seat seal
(part 6) unscrew the nut (part 10) counter clockwise, replace the seal
and reassemble the parts putting glue “Nm045” on the thread.
MAINTENANCE
If you use a CVA valve properly, and in accordance with the instructions
listed, it will be maintenance free. However, should it be necessary to
replace any part, that will be easily done, by any member of your staff
without any special training or equipment.
Upon final installation of the Series CVA Compact Valve and Actuator,
no routine maintenance is required. A periodic check of the system
calibration is recommended. The Series CVA is field serviceable but
should be returned if repair is needed (field repair may void warranty).
Be sure to include a brief description of the problem plus any relevant
application notes. Contact customer service to receive a return goods
authorization number before shipping.
©Copyright 2014 Dwyer Instruments, Inc. Printed in U.S.A. 4/14 FR# RV-443455-00 Rev. 3
W.E. ANDERSON DIV., DWYER
INSTRUMENTS, INC.
P.O. BOX 358 • MICHIGAN CITY, INDIANA 46360 U. S. A.
Phone: 219/879-8000 www.dwyer-inst.com
Fax: 219/872-9057 e-mail: info@dwyermail.com
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