cvs type 657 diaphragm actuator - delta valves … · cvs type 657 diaphragm actuator sizes 30-80...
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CVS Type 657 Diaphragm Actuator
Sizes 30-80 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.
IntroductionThe 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.
Technical Bulletin
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
Figure 1: CVS Type 657 Actuator
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Table 1: CVS Type 657 Diaphragm Actuator Specifications
Actuator Size 30 34 40 45 46 50 60 70
Nominal Effective Area (Sq.In.) (Diaphragm) 46 69 69 105 156 105 156 220
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
Valve Body Stem Size (In.) 3/8 3/8 1/2 1/2 1/2 3/4 3/4 3/4
Maximum Allowable Stem Force (Lbs) 2300 2300 2700 5650 7550 5650 6800 8800
Maximum Travel (In.) 3/4 1-1/8 1-1/2 2 2 2 2 3
Maximum Diaphragm Case Pressure (PSI)* 140 75 75 60 50 60 50 65
Kg 16 22 23 37 49 42 53 107 Approximate Weight Lb 36 48 51 82 107 92 116 235
*Maximum allowable diaphragm case pressure may be used only when maximum allowable stem forces are not exceeded.
TYPE 657 ACTUATOR
3 to 15 Psig Bench Set
Range
6 to 15 Psig Bench Set
Range
8 to 15 Psig Bench Set
Range
6 to 30 Psig Bench Set
Range
10 to 30 Psig Bench Set
Range
14 to 30 Psig Bench Set
Range46 138 230 138 322 506
7/16 657-1 657-4 657-7 657-10 657-13 657-165/8 657-2 657-5* 657-8 657-11 657-14 657-173/4 657-3 657-6* 657-9 657-12 657-15 657-18
69 207 345 207 483 7597/16 657-18 657-21 657-24 657-27 657-30 657-335/8 657-19 657-22 657-25 657-28 657-31 657-343/4 657-20 657-23 657-26 657-29 657-32 657-35
46 207 345 207 483 7595/8 657-36 657-40 657-44 657-48 657-52 657-563/4 657-37 657-41 657-45 657-49 657-53 657-57
1-1/8 657-38 657-42 657-46 657-50 657-54 657-581-1/2 657-39 657-43 657-47 657-51 657-55 657-59
105 315 525 315 735 11555/8 657-60 657-65 657-70 657-74 657-79 657-843/4 657-61 657-66 657-71 657-75 657-80 657-85
1-1/8 657-62 657-67 657-72 657-76 657-81 657-861-1/2 657-63 657-68 657-73 657-77 657-82 657-87
2 657-64 657-69 … 657-78 657-83 …156 468 780 468 1092 1716
3/4 657-88 657-91 657-93 657-94 657-97 657-991-1/2 657-89 657-92 … 657-95 657-98 …
2 657-90 … … 657-96 … …105 315 525 315 735 1155
3/4 657-100 657-103 657-106 657-108 657-111 657-1141-1/2 657-101 657-104 657-107 657-109 657-112 657-115
2 657-102 657-105 … 657-110 657-113 …283 849 1415 849 1981 3113
3/4 657-116 657-119 657-121 657-122 657-125 657-1271-1/2 657-117 657-120 … 657-123 657-126 …
2 657-118 … … 657-124 … …220 660 1100 660 1540 2420
1-1/2 657-128 657-131 … 657-133 … 657-1372 657-129 … 657-132 657-134 657-136 657-1383 657-130 … … 657-135 … …
Approximate Shipping Weight for Type 657
Maximum Unbalance (Lb.)
40 2-13/16"
Maximum Unbalance (Lb.)
Maximum Unbalance (Lb.)
60
TRAVEL, INCH
CVS NUMBERS FOR AIR TO DIAPHRAGM, PSIG3 to 15 6 to 30
34
30 (R) 2-1/8"
ACTUATOR SIZE
YOKE BOSS SIZE
Maximum Unbalance (Lb.)
Maximum Unbalance (Lb.)
45 2-13/16"
Maximum Unbalance (Lb.)
2-1/8"
Maximum Unbalance (Lb.)
50 3-9/16"
46 2-13/16"
Maximum Unbalance (Lb.)
70 3-9/16"
3-9/16"
TYPE 657 Options and List Price Extras
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Delta Valves and Controls, LLC11614 Mighty Redwood DriveHouston, Texas, 77059 USA
Tel: (713) 206-3910 | Fax: (281) 218-7030
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E-mail: [email protected]
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