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Instrument
Diaphragm Valve & Stager Control > V42 Series

Metal Diaphragm Valves

Features and Options

  • Low Pressure Loss
    The AquaMatic Y-pattern diaphragm valve features a large seat opening and high lift-disc for higher flow rates at a lower pressure loss than other comparable valves.
  • Positive Control
    A separate valve flow and control chambers permits positive sealing without springs. The optional spring-assist open feature is available for low pressure and self-draining applications.
  • Cost Effective
    The AquaMatic is a cost-effective solution both in initial cost, as well as lifetime maintenance expenses.
  • Long Diaphragm Life
    Separate diaphragm chambers protects the diaphragm from the flow stream, while allowing the valve to be serviced in-line.
  • Durable Construction
    The valve is constructed of cast iron, brass, stainless steel and Nitrile elsastomer components, giving an unparalleled service life of three years or longer depending on the application's environment.
  • Design and application engineering service
  • Optional seal and diaphragm materials for special applications
  • Handles liquid and gases
  • Adaptable to wide variety of control devices
  • Optional adjustable flow rate control
  • Optional spring assist
  • Optional position indication
  • Optional all stainless internals (Up to 4 sizes)
Principles of Operation
Drip-Tight Closing: Closure is obtained by directing line pressure or equivalent independent pressure into the upper chamber. This pressure on the large diaphragm area causes the valve disc to seal against the seat. (Ratio of diaphragm to disc area is 1.3 or greater.)
Full Open Operation: When closing pressure, in upper chamber, is relieved by venting the pilot line, the valve opens, positively, by line pressure on the disc.
Series 420 Valves

Standard valves are normally open. Body and cap are of cast iron. Preformed stress-relieved diaphragm of Nitrile (Buna N) on Polyamide, and static seals are Nitrile, stainless steel and brass internal parts.

Pipe sizes are 3/4 to 3-inch threaded (N.P.T. or B.S.P.); 3-inch through 6-inch flanged drilled in accordance with ASA16.1 class 125, or BSP4504.

  • Options
    Normally closed, spring assist closed, spring assist open, limit stop, position indicator, high temperature service, brass body and cap (3/4 to 3-inch only), optional seal and diaphragm materials for special application, stainless steel internal parts.
  • Operating Specifications
    • Working Pressure 125 PSI (8.6 bar)
    • MaximumTemperature 150F (65C) - Optional 250F (120C).
Series 820 Valves

High pressure valves are identical to the series 420 valves: body & cap are cast brass and internal components are designed to withstand higher pressure (size 3 /4-inch to 3-inch only).

  • Options
    Limit stop, normally closed, spring assist open and spring assist closed.
  • Operating Specification
    • Pressure 250 PSI (17 bar)
    • Temperature 150F (65C) Maximum
Series VAV Air Valves

Standard valves are normally open. Body and cap are of cast iron. Preformed stress-relieved diaphragm of Nitrile (Buna N) on Nylon, and static seals are FKM & Hycar, stainless steel and brass internal parts.

Pipe sizes are 3/4 to 3-inch threaded (N.P.T. or B.S.P.); 3 to 4-inch flanged drilled in accordance with ASA16.1 class 125, or BSP4504.

  • Options
    Normally closed, spring assist closed, spring assist open, all stainless steel internals, FKM diaphragm for high temperature service.
  • Operating Specification
    • Working Pressure 125 PSI (8.6 bar) maximum.
    • Temperature 150F (65C) - Optional 250F (120C) .
Applications

  • Concrete Additive
  • Agricultural Irrigation
  • Turf Irrigation
  • Air Dryers
  • Pump Controls
  • Fuel Handling
  • Conveyor Systems
  • Air Control Systems
  • Dust Suppression
  • Plastic Molding
  • Machinery
  • Nitrogen Handling
  • CoolingTowers
  • Level Control Systems
  • Sand Blasting
  • Car Wash Systems
  • Process Water Systems
  • Laundry Equipment
  • Vacuum Control
  • Systems
  • Machine Hydraulic
  • Cooling Control
  • Street Cleaning Vehicles
  • Centrifugal Separators
Flow Thru Metal Diaphragm Valves



- - -Maximum continous flow at velocity 20 ft/sec
- - - - -   Maximum intermittent flow at velocity 30 ft/sec

Maximum Working Pressure (PSI)
Series Standard Temperature Rating

150F/65C
Optional Temperature Rating
200F/93C 250F/121C
421
200
175
165
424, 425, 426
175
150
140
427, 428
150
125
125
429 125 100 100

Metal Body Valves


Pipe Size
Inches
Model Number

Cv(3)

Dimensions
(Approximate)

420 Series 820 Series VAV Series Units

As

Af

Bs

Bf

Cs

Cf

D

E(1)

F(2)

Threaded
3/4
V42B
V82B
VAVB
11.4
in.
mm.
3.69
94
4.25
108
3.75
95
2.75
70
1 V42C V82C VAVC 12.8

1-1/4

V42D

V82D

N/A

26.5

in.
mm.

4.75 121

5.37
137

4.00
102

3.50
89

1-1/2 V42E V82E VAVE 32.5

2

V42F

N/A

VAVF

56

in.
mm.

6.62
168

7.25
184

5.37
137

4.87
124

2

V42G

V82G

VAVG

68

in.
mm.

7.37 187

8.00 203

5.75 146

5.50 140

2-1/2 V42H V82H VAVH 84

3

V42J

V82J

VAVJ

134

in.
mm.

9.00
229

9.75
248

6.75
171

7.25
184

Flanged

3

V42J

N/A

VAVJ

134

in.
mm.

10.62
270

10.75
273

7.00
178

7.25
184

6.00
152

0.75
19

4

V42K

N/A

VAVK

275

in.
mm.

11.75
298

14.75
375

10.00
254

8.75
222

7.50
191

0.75
19

6

V42L

N/A

N/A

680

in.
mm.

17.00
432

19.00
483

13.50
343

15.75
400

9.50
241

0.87
2


(1) Bolt circle diameter   (2) Bolt hole diameter   (3) CV=Flow rate in gpm of water at 60F@1psi pressure drop
 

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