DESCRIPTION Multi-Spring Diaphragm Actuators Models VC-230A, VC-231A

DESCRIPTION  Multi-Spring Diaphragm Actuators Models VC-230A, VC-231A
Sales Manual Section 170
Product Specification VC-230A, VC-231A
Multi-Spring Diaphragm Actuators
Models VC-230A, VC-231A
DESCRIPTION
The VC-230A direct-acting model and the VC-231A
reverse-acting model are spring opposed diaphragm
actuators. They are designed to provide dependable On-Off
or throttling operation of control valves.
They may be actuated by pneumatic signals from any
suitable temperature or pressure controller.
SPECIFICATIONS
Diaphragm Area: ................. 29 sq. inches (0.02m²) nominal
Service Connection: ....................................... 1/4" - 18 NPT
Pattern: ............................................. Enclosed Spring Type.
Spring Ranges: .................... 3-15 psi (0.2-1.0 bar) standard.
Other ranges available.
Diaphragm Pressure:
100 psi (6.9 bar) max. test
40 psi (4.8 bar) max. working
Maximum Stroke: ............................................ 1" (25.4 mm)
Ambient Temperature: .................................... 200°F (93°C)
Actuator Action:
VC-230A ............................................ Air-to-push-down
VC-231 A .................................................Air-to-push-up
Materials:
Diaphragm Housing ......................... Steel, painted with
polyurethane enamel.
Diaphragm ............................Buna-N, Nylon reinforced.
Diaphragm Plate ................................ Aluminum casting
Springs .......................... Tempered MB wire, zinc plated
Actuator Stem ...........................................Stainless Steel
Actuator Stem Guide ................ Bronze, Self-lubricating
Frame ............................................................. Cast iron.
Stem Connector .................................................Stainless
Stroke Indicator ............................................. Aluminum
Model VC-230A
FEATURES
•
•
•
•
•
•
ACTUATOR
OPERATION
Molded Buna-N diaphragms, nylon reinforced.
Steel Diaphragm Cases.
Multiple Steel Springs
Sturdy cast iron lower frame.
Quick disconnect valve stem construction.
Valve position indicator.
Model VC-230A - Air pressure from the controller is
applied to the top of the diaphragm. As this pressure
increases within the range of the load spring, the actuator
stem moves down.
Model VC-230A
Actuator
(Air-to-Push-Down)
Increasing
Air
Air
Failure
Pressure
Model VC-231A - Air pressure form the controller is
applied underneath the diaphragm. Increasing pressure
causes the actuator stem to move upward.
Direct-Acting
Valve (Push
down to close)
Reverse-Acting
Valve (Push
down to open)
The following table illustrates valve action when models
VC-230A and VC-231A are used. Most Robertshaw valve
styles with strokes not exceeding 1" can be furnished with
either of these actuators for air-to-close or air-to-open
operation.
1
Model VC-231A
Actuator
(Air-to-Push-Up)
Increasing
Air
Air
Failure
Pressure
Closes
Opens
Opens
Closes
Opens
Closes
Closes
Opens
18 UPPER HOUSING
11 DIAPHRAGM
9 DIAPHRAGM PLATE
8 STEM
16 OR 17 SPRING
6 LOWER HOUSING
3 GUIDE
27 VALVE STROKE INDICATOR
26 LOCKWASHER
25 LOCKNUT
32 SCREW
INDICATOR PLATE
24 CONNECTOR
ACTUATOR ASSEMBLY
VC-230A (DIRECT-ACTING)
4 FRAME
18 UPPER HOUSING
16 OR 17 SPRING
9 DIAPHRAGM PLATE
11 DIAPHRAGM
8 STEM
3 GUIDE
6 LOWER HOUSING
- INDICATOR PLATE
32 SCREW
27 VALVE STROKE INDICATOR
26 LOCKWASHER
25 LOCKNUT
24 CONNECTOR
ACTUATOR ASSEMBLY
VC-231A (REVERSE -ACTING) 2
4 FRAME
CONTROL VALVES USED WITH VC-230A AND VC-231A ACTUATORS
1 and Shipping Weights
Valve Body Assembly Characteristics
SINGLE SEATED VALVES
Valve Type
Body
Material
and Rating
Trim
BC
PERCENTAGE
1”-2”
(Direct Acting Only)
Brass
250 PSI
Composition
Disc.
Integral
Brass Seat
BG
PERCENTAGE
(Direct Acting Only)
Brass
250 PSI
316
Stainless
Steel
316 St. St.
Class 150
316
Stainless
Steel
CSS
(Direct and Reverse
Acting)
MA
QUICK OPENING
(Direct Acting Only)
Fully
Balanced
MAS
QUICK OPENING
(Direct Acting Only)
Fully Balanced
Brass
250 PSI
316
Stainless
Steel
Cast Iron 125 PSI
316
Stainless
Steel
Cast Steel
300 PSI
Valve Size and
Type of Ends
Port Size
In. (mm)
1" Screwed
1 1/4" Screwed
1 1/2" Screwed
2" Screwed
1/2" Screwed
3/4" Screwed
1" Screwed
1 1/4" Screwed
1 1/2" Screwed
1/2" Screwed
3/4" Screwed
1" Screwed
3/4" Screwed Unions
1" Screwed Unions
1 1/4" Screwed Unions
1 1/2" Screwed Unions
2" Flanged
3/4" Screwed
1" Screwed or Flanged
1 1/2" Screwed or Flanged
2" Flanged
1 (25.4)
1 1/4 (31.8)
1 1/2 (38.1)
2 (50.8)
1/2 (12.7)
3/4 (19.0)
1 (25.4)
1 1/4 (31.8)
1 1/2 (38.1)
1/2 (12.7)
3/4 (19.0)
1(25.4)
3/4 (19.0)
1 (25.4)
1 1/4 (31.8)
1 1/2 (38.1)
2 (50.8)
3/4 (19.0)
1 (25.4)
l 1/2 (38.1)
2 (50.8)
Full
Open
Cˇ
9.3
17
25
40
2.0
5.3
9.5
15
23
2.3
7.3
9.5
9.8
12.8
18.6
26
47.5
10.5
12.2
25.5
47.8
Shipping
Weight
Lbs.
28 (12.7)
30 (13.6)
30 (13.6)
39 (17.7)
24 (10.9)
25 (11.5)
28 (12.7)
30 (13.6)
30 (13.6)
25 (11.3)
25 (11.3)
25 (11.3)
28 (12.7)
28 (12.7)
33 (15.0)
35 (15.9)
50 (22.7)
29 (13.2)
29 (13.2)²
40 (18.2)²
68 (30.9)
Max. ∆P with
30 In.² (0.02m² Actuator
3-15 PSI (0.2 .1.0) bar Range
40 2.76
40 (2.76)
40 2.76
40 2.76
125 8.62
125 (8.62)
125 (8.62)
125 (8.62)
100 (6.90)
100 (6.90)
100 (6.90)
100 (6.90)
250 (17.2)
250 (17.2)
250 (17.2)
250 (17.2)
150 (10.3)
250 (17.2)
250 (17.2)
250 (17.2)
150 (10.3)
DOUBLE SEATED VALVES
Valve Type
FA end FAR
QUICK OPENING
(Direct end
Reverse Acing)
Top and
Bottom Guided
Body Materiel
and Rating
Trim
Bronze
125 PSI
Brass Or Monel
Cast Iron
125 PSI
303 St. St. Plug
316 St. St. Seat
Valve Size
and
Type of Ends
Port
Sire
In. (mm)
Full
Open
Cv
3/4" Screwed Unions
1” Screwed Unions
1 1/4" Screwed Unions
1 1/2" Screwed Unions
2" Flanged
2 1/2" Flanged
3” Flanged
4” Flanged
3/4 (19.0)
1 (25.4)
1 1/4 (31.8)
1 1/2 (38.1)
2 (50.8)
2 1/2 (63.5)
3 (76.2)
4 (102)
9.3
17.6
22.5
30.4
59.3
82.5
130
226
3
Maximum ∆P with
Shipping²
30 in² (0.02m²)
Weight
Actuator
Lbs. (Kg.) 3-15 psi (0.2 - 1.0 bar)
Range
25 (11.3)
125 (8.62)
28 (12.7)
125 (8.62)
30 (13.6)
125 (8.62)
33 (15.0)
125 (8.62)
50 (22.7)
100 (6.90)
63 (28.1)
100 (6.90)
73 (33.1)
100 (6.90)
103 (46.8)
100 (6.90)
THREE-WAY VALVES
Valve Type
WA
QUICK
OPENING
Unbalanced
Mixing Service Only
WCSS
Unbalanced
Mixing Service Only
Body Material
and Rating
Brass
150 PSI
Trim
316 St. St. Upper Seat
316 St. St. Lower Seat
316 St. St. Plug
316 St. St. Seats
316 St. St. Plug
316 St. St. Upper Seat
316 St. St. Lower Seat
316 St. St. Plug
316
Stainless
Class 150
316 Stainless Steel
WD
QUICK OPENING
Balanced
Mixing or Diverting
Brass
100 PSI
Brass
WE
LINEAR
(Top and Bottom
Guided)
Unbalanced
Service Mixing Only
Brass
300 PI
Brass
Full Open
Cv
N.O. N.C.
Shipping²
Weight Lbs.
(Kg)
Max. ∆P with
30 In.² (0.02m² Actuator
3-15 PSI (0.2 - 1.0 bar)
Range
3.1
24 (10.9)
75 (5.18)
7.8
11.1
5.6
8.8
25 (11.3)
25 (11.3)
75 (5.18)
75 (5.18)
1 1/4 (31.8)
23.5
18.1
30 (13.6)
75 (5.18)
1 1/2 (38.1)
31.7
25.0
32 (14.5)
75 (5.18)
A-C
A-B
A-C
A-B
A-C
A-B
64
77
115
240
360
520
2.2
4.6
9.0
18
25
40
2.2
2.2
4.6
4.6
9.0
9.0
64
77
105
250
415
600
2.2
4.6
9.0
18
25
40
25 (11.3)
1/2 (100)
25 (11.3)
3/4 (80)
Valve Size and
Type & Ends
Port Size
In. (mm)
1/2" Screwed Unions
1/2 (12.7)
4.2
3/4" Screwed Unions
1" Screwed Unions
3/4 (19.0)
1 (25.4)
1 1/4" Screwed
unions
1 1/2" Screwed
Unions
1/2" Screwed
1/2 (12.7)
3/4" Screwed Unions
3/4 (19.0)
1" Screwed
1 (25.4)
2" Flanged
2 1/2" Ranged
3" Flanged
4" Flanged
5" Ranged
6" Flanged
1/2" Screwed
3/4" Screwed
1" Screwed Unions
1 1/4" Screwed
1 1/2" Screwed
2" Screwed
2 (50.8)
2 1/2 (63.5)
3 (76.2)
4 (102)
5 (127)
6 (152)
1/2 (12.7)
3/4 (19.0)
1 (25.4)
1 1/4 (31.8)
1 1/2 (38.1)
2 (50.8)
25 (11.3)
1 (40)
68 (30.9)
80 (36.3)
86 (39.0)
144 (65.4)
200 (90.8)
247 (112)
24 (10.9)
26 (11.8)
28 (12.7)
31 (14.1)
30 (13.6)
40 (182)
40 (2.76)
40 (2.76)
40 (2.76)
25 (1.73)
25 (1.73)
25 (1.73)
50 (3.45)
50 (3.45)
50 (3.45)
50 (3.45)
50 (3.45)
40 (2.76)
FOOTNOTES:
1. For complete valve body assembly specifications, see catalog sections on Control Valves.
2. Shipping weights are for valve body assembly and actuator.
3. Weights shown are for screwed end valves. Weights for flanged valves are: 1" - 35 lbs. (15.9 Kg); 1 1/4" - 42 lbs. (19.1 Kg); 1 1/2" - 52 lbs. (23.6 Kg)
VALVE SIZING
MODEL IDENTIFICATION
All Robertshaw valve capacities are stated in terms of
Cv. Use of the flow coefficient Cv offers a standard
approach for valve sizing regardless of type. Cv ratings
for Robertshaw valves are determined experimentally in
accordance with procedures recommended by the Fluid
Controls Institute.
Control Valve Identification - The identification scheme
used by Robertshaw shows size, actuator type, valve style,
plug characteristics, and whether direct- or reverse-acting.
Viz., VC-230-FA. This is a 2" air-to-close control valve
using an air-to-push-down actuator and a direct-acting
double-seated style FA valve which has quick opening flow
characteristics. Similarly, a 3" VC-230-FAR is a 3"
air-to-open control valve using an air-to-push-down actuator
and reverse-acting double seated style FA valve (FAR). "R"
on the suffix indicates a reverse-acting body.
Valve sizes may be calculated using Cv formulas or
Robertshaw's Flo-Rule (valve sizing slide rule) for any
set of flow conditions. When capacity requirements
(pounds of steam per hour, gallons of water per minute,
cubic feet of gas per hour, etc.), the supply pressures,
pressure drops, and nature of fluid are known, the
numerical Cv value can be obtained. This can be
compared with Cv ratings tabulated for the various valve
styles in the "Valve Characteristics" tables in this product
specifications or on the Cv tables furnished with the
Flo-Rule.
ORDERING INFORMATION
When ordering, specify:
1. Quantity.
2. Control valve model number.
(See "Control Valve Identification" above)
3. Spring range required.
4. Valve type, size and action.
(See "Control Valve Identification")
5. Medium through valve.
6. Supply pressure to valve.
7. Pressure drop.
8. Any special characteristics of the flowing medium.
The Robertshaw Flo-Rule is available upon request
from any Robertshaw representative or from the factory.
4
DIMENSIONS
All dimensions in inches (millimeters)
Dim.
Valve
Size
In.
BC
1/2
3/4
D
E
1
2-3/4 (69.9)
1 1/4 2-3/4 (69.9)
1 1/2 2-3/4 (69.9)
2
2-13/16 (71.4)
2 1/2
3
4
5
6
1/2
3/4
1
5 (127)
1 1/4
5-1/8 (130)
1 1/2
5-1/8 (130)
2
2 1/2
3
4
5
6
6-3/4 (171)
1/2
3/4
L
1
1-7/8 (47.6)
1 1/4
1-7/8 (47.6)
1 1/2
1-7/8 (47.6)
BG
1-15/16
(49.2)
1-15/16
(49.2)
2-3/4 (69.9)
2-3/4 (69.9)
2-3/4 (69.9)
MA
3-7/16 (87.3) 3-7/16 (87.3)
6-15/16 (176)
7-1/8 (181)
7-1/2 (191)
5 (127)
8-1/2 (216)
2
2-1/8 (54.0)
2 1/2
3
4
5
6
All
9.5 (241)
9.5 (241)
K
All
A
All
B
All
C
* 9-1/4" (235 mm) on 300 lb. flanged body.
VALVE STYLES
FA
Direct Acting Reverse Acting
2-1/16 (52.4)
3-7/16 (87.3) 3-7/16 (87.3) 2-13/16 (71.4)
3-5/8 (92.1)
2-13/16 (71.4)
4-1/8 ( 105) 4-1/8 (105)
3-1/8 (79.4)
4-15/16 (125)
5 (127)
3-13/16 (96.8)
4-3/8 (111)
4-3/4 (121)
5-13/16 (148)
3 (76.2)
4 (102)
5 (127)
5 (127)
1-11/16
(42.9)
2 (50.8)
2-15/16
(74.6)
2-15/16
(74.6)
2-15/16
(74.6)
MAS
5-3/4 (146)
5-3/4 (146)
5-5/8 (143)
7-1/4 (184)
7-13/16 (198)
2-1/16 (52.4)
WA
WD
WE
1-9/16 (39.7)
1-13/16 (46.0)
1-7/8 (47.6)
1-15/16 (49.2)
2-13/16 (71.4) 1-7/8(47.6)
2-13/16 (71.4) 2-11/16 (68.3)
3-1/8 (79.4)
3-1/16 (77.8)
3-1/8 (79.4)
4-3/16 (106)
3-5/8 (92.1)
4 (102)
3-15/16 (100)
4 (102)
5 (127)
3-9/16 (90.5)
6 (152)
6 (152)
4-3/4 (121)
5-5/8 (143)
6-13/16 (157)
7-1/4 (184)
6-1/4 (159)
7-13/16 (198) 7-13/16 (198)
2-3/4 (69.9)
2-3/4 (69.9)
2-7/8 (73.0)
2-7/8 (73.0)
3 (76.2)
4 (102)
5 (127)
5 (127)
7 (178)
8-13/16
(224)*
10-1/2 (267)
2-1/8 (54.0)
1-5/16 (33.3)
1-1/2 (38.1)
1-1/2 (38.1)
2-5/16 (58.7)
2-5/16 (58.7)
2-7/16 (61.9)
2-1/4 (57.2)
1-1/2 (38.1)
1 1/2 (38.1)
3-1/16 (77.8)
3-1/16 (77.8)
2-7/16 (61.9)
3-1/2 (88.9)
3-1/16 (77.8)
3-1/16 (77.8)
3-1/4 (82.6)
3-1/2 (88.9)
3-3/8 (85.7)
3-3/8 (85.7)
3-3/4 (95.3)
3-3/8 (85.7)
3-1/8 (79.4)
3-5/8 (92.1)
3-15/16 (100)
5 (127)
3-13/16 (96.8)
4-3/8 (111)
4-3/4 (121)
5-13/16 (148)
1-7/8 (47.6)
1-15/16 (49.2) 1-15/16 (49.2)
2-3/4 (69.9)
2-3/4 (69.9)
8-1/2 (216)
8-1/2 (216)
7 (178)
7-3/4 (197)
8-5/8 (219)
10-1/4 (260)
7 (178)
7-3/4 (197)
8-5/8 (219)
10-1/4 (260)
8-11/16 (221)
5-1/8 (130)
8-5/8 (219)
10 (254)
10-1/2 (267)
15-7/8 (403)
19-1/4 (489)
23-1/2 (597)
5-3/16 (132)
6-1/2 (165)
6-3/4 (171)
8-9/16 (217)
11-5/8 (295)
13-7/16 (341)
9.5 (241)
9.5 (241)
9.5 (241)
9.5 (241)
9.5 (241)
9.5 (241)
Add dimensions B and D for VC-230A, and add dimensions C and D for VC-231A
9-3/8 (238) for VC-230A
10-7/8 (276) for VC-231A
5
6-3/4 (171)
3-3/4 (95.3)
9.5 (241)
6
Q-4144 (7/01)
Printed in U.S.A.
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