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DIAPHRAGM CONTROL VALVE

INTRODUCTION

The Diaphragm Valve is essentially a simple pinch clamp, closed by pressing a flexible diaphragm against transverse weir, when fully closed, the diaphragm seats against the weir providing a leak tight closure. The diaphragm valves are recommended for handling sticky and viscous fluids, slurries and highly corrosive and hazardous substances and other hard to handle mediums or where tight closure is prime factor. It is the most ideal valve to handle fluids that require high purity and should remain free from contamination. The Diaphragm Valve is a simple pinch type valve and of low pressure type because of large area of diaphragm and is extensively used for both
On/Off and throttling services and finds its application in Waste & Water Treatment Plants, Filtration Plants, Chlorination Plants etc.

 

SPECIFICATION :
DESIGN
Confirm to BS - 5156
BODY TYPE Weir (Rubber Lined – Series MIC 521)
(Unlined – Series MIC 541)
(PFA Lined – Series MIC 551)
VALVE SIZE 15mm to 300mm (1/ 2" to 12")
END CONNECTION ANSI B 16.1Class 150
BODY MATERIAL Cast Iron (IS 210 grade FG 200)
Cast Steel, Other alloys on request.
LINING MATERIAL Ebonite, PVDF, PFA, PP, EPDM, Glass etc.
LINING HARDNESS Ebonite-95° ± 5 Shore A
Natural/Neo Rubber-55° ± 5 Shore A
Teflon-Rockwell/Shore R100 D78 or
D62 Glass lining & FRP-Parcol Parcol 40
Respectively.
LINING THICKNESS 15 to 65 mm Valve - 3.0 mm
80 to 100 mm Valve - 3.5 mm
125 to 150 mm Valve - 4.0 mm
200 to 300 mm Valve - 5.0 mm
Teflon Coating Thickness – 800 micron,
Glass Lining – 1.5mm.
BODY DIAPHRAGM Neoprene, Teflon Backed with Neoprene
Butyl, Viton, Hyplon, Nitrile, EPDM.
LEAKAGE RATE As per ANSI B 16.104 Class VI (100% Leak tight.)
TEMPERATURE - 30°C to 80°C
FLOW CHARACTERISTICS BS 6755 Part - I
TESTING STANDARD May be adjusted throughout a spring range
by turning the adjusting screw.
ACTUATOR TYPE Diaphragm or Motorized or Cylinder
ACTUATOR ACTION Direct Acting - Normally Open (Air to Close)
Reverse Acting - Normally Close (Air to Open)
SPRING RANGE 3 – 15 PSIG (0.2 – 1.0 Kg/cm2)
8 – 20 PSIG (0.4 – 2.0 Kg/cm2)
18 – 30 PSIG (1.2 – 2.0 Kg/cm2)
AIR SUPPLY 20-50 PSIG (1.4-3.5 Kg/cm2)
AIR CONNECTION 1/ 4" or 1/ 2" NPT
ACCESSORIES OPTIONAL Top or Side Mounted Handwheel, Limit Switches
Airset, Valve Positioner etc.
DIAPHRAGM VALVE WITH REVERSE ACTUATOR DIAPHRAGM VALVE WITH DIRECT ACTUATOR
diaphragm-valve-with-reverse-actuator diaphragm-valve-with-direct-actuator
 

DESIGN AND PERFORMANCE FEATURES :

  • It is a full bore straight through, give high flow performance with minimum turbulence,
    while giving 100% leak tight closure.
  • Perfect sealing and longer diaphragm life due to weir design.
  • Valve is self cleaning with no pockets, recesses, corners, grooves or sharp edges in the
    direction of flow.
 
VALVE SIZING CO-EFFICIENT Cv RATINGS
VALVE SIZE
TRAVEL(in)
RUBBER LINED
UNLINED OR GLASS LINED
(in)
RUBBER
TEFLON
RUBBER
TEFLON
RUBBER
TEFLON
 

DIAPHRAGM
DIAPHRAGM
DIAPHRAGM
DIAPHRAGM
DIAPHRAGM
DIAPHRAGM
½
¼
¼
6
4
6
4
¾
3/8
3/8
12
6
9
6
1
3/8
9/16
15
12
12
10
1 ½
¾
¾
40
25
30
20
2
1 1/8
¾
55
35
50
30
2 ½
1 ¼
15/16
85
55
75
50
3
1 ½
1 ¼
120
75
95
70
4
1 ¾
1 ½
210
180
200
160
6
2 ¾
--
375
275
350
270
8
3
--
650
475
625
450
10
3 ½
--
870
1045
845
1020
12
4
--
1328
1503
1303
1478
 
 
ACTUATOR SELECTION GUIDE FOR RUBBER LINED DIAPHRAGM VALVE
 
Valve Characteristics/Action
On/Off/
Control Duty
Air to Open
On/ Off
Air to Close
Control Duty
Air to Close
Air Supply to Actuator (Psig)
25
35
18
28
38
28
28
Spring Range (Psig)
8-20
18-30
3-6
3-15
Valve
Size
Max.
Travel
Actuator Size
Shut Off Pressure
Kg/ Cm2
Shut Off Pressure
Kg/ Cm2
Shut Off Pressure
Kg/ Cm2
Upto 1”
9/16”
12
--
6.0
--
6.0
12.0
--
6.0
30
10.0
22.0
7.0
22.0
38.0
7.0
22.0
1 ½”
¾”
30
--
8.0
--
8.0
15.0
--
8.0
55
5.5
18.0
5.5
18.0
32.0
5.5
18.0
2”
1 1/8”
55
--
8.0
--
8.0
17.0
--
8.0
95
5.0
18.0
5.0
18.0
33.0
5.0
18.0
2 ½”
1 ¼”
55
--
7.5
--
7.5
14.0
--
7.5
95
4.0
16.0
4.0
16.0
28.0
4.0
16.0
3”
1 ½”
95
--
7.5
--
7.5
15.0
--
7.5
140
3.5
13.5
3.5
13.5
24.0
3.5
13.5
4”
1 ¾”
95
--
4.0
--
4.0
8.0
--
4.0
140
--
7.0
--
7.0
14.0
--
7.0
300
7.0
20.0
7.0
20.0
35.0
7.0
20.0
5”
2”
140
--
7.0
--
7.0
14.0
--
7.0
300
7.0
20.0
7.0
20.0
35.0
7.0
20.0
6”
2 ¾”
140
--
2.0
--
2.0
5.0
--
2.0
300
1.5
8.0
1.5
8.0
16.0
1.5
8.0
8”
3”
300
--
3.0
--
3.0
6.0
--
3.0
600
2.5
9.0
2.5
9.0
16.0
2.5
9.0
10”
3 ½”
600
0.5
5.7
0.5
5.7
11.0
0.5
5.7
12”
4”
600
0.4
3.0
0.4
3.0
6.0
0.4
3.0
 
 
LINE PRESSURE AT ONE END ONLY (FOR LINE PRESSURE AT BOTH ENDS MULTIPLY DP VALUES BY 0.5)
 
Line-pressure-at-one-end-only
 
ACTUATOR SELECTION GUIDE FOR PTFELINED DIAPHRAGM VALVE
Valve Characteristics/Action
On/Off/
Control Duty
Air to Open
On/ Off
Air to Close
Control Duty
Air to Close
Air Supply to Actuator (Psig)
25
35
20
35
30
40
Spring Range (Psig)
8-20
18-30
3-6
3-15
Valve
Size
Max.
Travel
Actuator Size
Shut Off Pressure
Kg/ Cm2
Shut Off Pressure
Kg/ Cm2
Shut Off Pressure
Kg/ Cm2
½”
¼”
30
6.0
12.0
9.5
15.5
9.5
15.5
55
10.0
NA
15.5
NA
15.5
NA
¾”
3/8”
30
7.0
12.0
9.5
15.5
9.5
15.5
55
10.0
NA
15.5
NA
15.5
NA
1”
9/16”
30
3.5
7.5
2.5
11.5
2.5
11.5
55
7.5
13.5
14.0
NA
14.0
NA
1 ¼”
9/16”
30
NA
4.0
2.5
7.5
2.5
7.5
55
5.0
13.5
9.5
NA
9.5
NA
1 ½”
¾”
30
NA
3.5
1.0
4.5
1.0
4.5
55
5.0
13.5
5.5
15.5
5.5
15.5
2”
¾”
55
2.0
9.0
5.5
15.5
5.5
15.5
95
4.5
13.5
7.5
NA
7.5
NA
140
12.0
NA
NA
NA
NA
NA
2 ½”
15/16”
55
1.0
6.0
2.0
15.5
2.0
15.5
95
3.0
10.5
5.5
15.5
5.5
15.5
140
9.0
NA
15.5
NA
15.5
NA
3”
11/4”
55
NA
4.0
1.0
6.5
1.0
6.5
95
4.0
12.0
8.0
15.5
8.0
15.5
4”
11/2”
140
2.0
6.5
3.5
11.0
3.5
11.0
300
4.0
13.5
8.5
NA
8.5
NA
6”
2”
300
2.0
7.0
4.5
11.0
4.5
11.0
8”
2 ¼”
300
NA
3.0
1.0
3.5
1.0
3.5
 
LINE PRESSURE AT ONE END ONLY
 
(FOR LINE PRESSURE FROM BOTH SIDES MULTIPLY DP VALUES BY 0.5) ACTUATOR
 

LINE PRESSURE AT ONE END ONLY

(FOR LINE PRESSURE FROM BOTH SIDES MULTIPLY DP VALUES BY 0.5) ACTUATOR

line-pressure-at-one-end-one-end-only

 

 
ACTUATOR DIMENSIONS
 
actuator-dimensions
 
 
ACTUATOR
MODEL
EFFECTIVE
Inch2
BONNET
MOUNT
DIA.
TRAVEL
ФD
H
H1
H2
H3
H4
H5
MIC-R 123
12
32
14.3
150
-
370
-
365
-
-
MIC-D 123
12
32
14.3
150
235
-
335
-
-
-
MIC-R 141
30
32
19
218
-
440
-
400
-
-
MIC-D 141
30
32
19
218
295
-
390
-
-
-
MIC-R 141
30
54
32
218
-
510
-
520
-
-
MIC-D 141
30
54
32
218
325
-
475
-
-
-
MIC-R 166
55
54
28
286
-
550
-
570
-
640
MIC-D 166
55
54
28
286
410
-
540
-
640
-
MIC-R 166
55
54
38
286
-
570
-
590
-
690
MIC-D 166
55
54
38
286
325
-
510
-
690
-
MIC-R 106
95
54
32
371
-
680
-
700
-
670
MIC-D 106
95
54
32
371
430
-
770
-
670
-
MIC-R 106
95
54
45
371
-
700
-
720
-
725
MIC-D 106
95
54
45
371
590
-
550
-
725
-
MIC-R 251
140
54
38
443
-
840
-
640
-
860
MIC-D 251
140
54
38
443
750
-
1000
-
860
-
MIC-R 251
140
90.5
70
443
-
870
-
890
-
1000
MIC-D 251
140
90.5
70
443
750
-
1000
-
1000
-
MIC-R 411
300
90.5
45
599
-
980
-
-
-
1230
MIC-D 411
300
90.5
45
599
950
-
-
-
1230
-
MIC-R 411
300
90.5
70/76
599
-
1070
-
-
-
1275
MIC-D 411
300
90.5
70/76
599
950
-
-
-
1275
-
  • Operates automatically off line pressure.
  • Heavy-duty, nylon-reinforced diaphragm.
  • Round-shaped, soft seat seal provides drip-tight class VI closure.
  • Diaphragm assembly guided top and bottom.

 

BODY DIMENSIONS
SIZE
F/F
H1
L
H
ØZ
Approx
Weights, In
Kgs.
Inch
mm
Lined
Unlined
½
15
114
108
45
75
117
31.7
2.50
¾
20
123
117
50
85
117
31.7
2.75
1
25
133
127
55
97
117
31.7
3.50
1 ¼
32
152
146
60
90
117
31.7
5.50
1 ½
40
162
159
70
110
117
31.7
6.75
2
50
196
190
75
135
117
53.9
11
2 ½
65
222
216
90
155
143
53.9
16.65
3
80
261
254
95
175
143
53.9
22.9
4
100
312
305
115
200
143
53.9
34.8
5
125
364
350
125
230
143
53.9
46.5
6
150
414
406
140
360
197
69.8
75
8
200
531
521
175
370
197
69.8
156
10
250
645
635
204
559
229
69.8
230
12
300
759
749
242
651
229
69.8
399
diaphragm-valve
 

INSTALLATION

The valve should be installed preferably in a straight run of the pipe, a few diameters away from the bends. The preferred position is with actuator vertically above or below the valve body. It may also be installed in a horizontal or angled position provided the diaphragm actuator is supported. Necessary clearance should be provided above the actuator to permit removal for servicing or for inspection of the valve internals. The supply pressure to the actuator be either 20 psig or 35 psig or as per rating indicated on the name plate. For control applications, positioner mounted are piped and adjusted at the factory.

 
 

FINAL CHECK

After the valve has been installed, check the operations for full stroke travel as indicated on the name plate. Check for air leaks in air line connection. Open and close the valve two or three times to ensure proper operation. Before commissioning the process flow, it would be advisable to use conical filter or other temporary devices to avoid damage to the rubber lining or body diaphragm as the fluid is likely to carry foreign solid material during testing or commissioning of the plant. This care is particularly important with neoprene or other soft elastomer lining. Special care has to be exercised with glass lining construction. It is generally not desirable to use excessive air pressure to the actuator than specified as it would reduce the life of the body diaphragm and also cause undue forces on the actuator diaphragm. Valves having manual hand wheels should be preferably operated with air pressure, particularly during the start of the plant when any foreign material is
likely to damage the internals.

 
 
  All type of regulators generally fit into one of the following two basic categories.
  1) Direct Operated
  2) Pilot Operated
  The specific considerations peculiar to your control needs is to be carefully studied and understood to determine which method of control is the better choice. Regulators when compared to control Valve / Instrument package have their advantages and limitations.   Table No.2 lists selected characteristic of both.
 
The Company’s policy is one of continuous product improvement and the right is reserved to modify the specifications contained herein without notice.
 
   
   
 
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