Dia-Flo® Weir Diaphragm Valve

Weir type diaphragm valve in which the diaphragm isolates the working parts from the process fluid and closes against the weir for bubble tight shutoff to MSS SP-88. Bodies come unlined in cast and ductile iron, steel, stainless, bronze and high alloys, or rubber lined, plastic lined, glass lined or in solid plastic, sized from 1/2" to 12" depending on body. Handwheel operated valves are rated 200 psig at 120 °F up to 1", falling to 65 psig at 10" and 12".

Size range

1/2" to 12" (varies by body and lining)

Body construction

Unlined metal, rubber lined, plastic lined, glass lined, solid plastic

Unlined metal body materials

Cast iron ASTM A-126 Class B; ductile iron ASTM A-395 Grade 60-40-18; cast steel ASTM A-216 Grade WCB; 316 stainless steel ASTM A-351 Grade CF8M; 316L stainless steel ASTM A-351 Grade CF3M; bronze ASTM B62 Alloy 836; Alloy 20 ASTM A-351 Grade CN7M; Hastelloy C ASTM A-494 Grade CW-6M; Monel ASTM A-494 Grade M-35-1; and more

Unlined metal bodies (figure no.)

Screwed: cast iron 1/2" to 3" (2401), bronze 1/2" to 3" (2402), stainless steel 316 1/2" to 2" (2403), cast steel 1/2" to 2" (2405), CN7M 1/2" to 2" (2407), Monel 1/2" to 2" (2408), Hastelloy 1/2" to 2" (2410), ductile iron 1" to 3" (2412); flat-faced flanged: cast iron 1/2" to 12" (2431), bronze 1/2" to 6" (2432), ductile iron 1/2" to 12" (2441); raised face flanged, all 1/2" to 8": stainless steel (2433R), cast steel (2435R), CN7M (2437R), Monel (2438R), Hastelloy (2440R); socket weld, all 1/2" to 3": stainless steel 316L (2470), cast steel (2472), CN7M (2474); socket (solder): bronze 1/2" to 2" (2456); buttweld, stainless steel 316L 1/2" to 6": Schedule 5 (2464), Schedule 10 (2465), Schedule 40 (2466)

Unlined metal max. temperature

350 °F (177 °C) for all unlined metal configurations

Rubber lined bodies (figure no.)

1/8" minimum lining thickness, full flat faced flange lining available. Cast iron 1/2" to 12": neoprene #7 (2501), soft rubber #5 (2516), hard rubber #10 (2521), chlorobutyl #16 (2522); ductile iron 1/2" to 8": neoprene #7 (2550), soft rubber #5 (2551), hard rubber #10 (2552); cast steel 1/2" to 8": neoprene #7 (2561), hard rubber #10 (2563)

Rubber lining max. temperature

Neoprene 200 °F (93 °C); soft rubber 180 °F (82 °C); hard rubber 200 °F (93 °C); chlorobutyl 200 °F (93 °C); temperature may decrease dependent upon media, pressure and valve size

Plastic lined bodies (figure no.)

3/16" minimum lining thickness (PFA .14" minimum), with Line-Lok. Cast iron 3/4" to 8": ETFE (2529), PVC (2536), polypropylene (2538), polypropylene unpigmented (2539), PVDF (2575); ductile iron 3/4" to 8": PVDF (2555), polypropylene (2558), ETFE (2559), and PFA 1" to 6" (2556); cast steel 3/4" to 8": ETFE (2545), polypropylene (2546), PVDF (2548), and PFA 1/2" to 6" (2564); stainless steel: PFA 1/2" to 6" (2540), ETFE 3/4" to 8" (2549)

Plastic lining max. temperature

PFA 350 °F (177 °C); ETFE 300 °F (149 °C); polypropylene 200 °F (93 °C); PVDF 285 °F (140 °C); PVC 140 °F (60 °C); temperature may decrease dependent upon media, pressure and valve size

Glass lined bodies (figure no.)

Cast iron 1/2" to 8" (2511); ductile iron 1/2" to 10" (2544); 100% spark testing before and after assembly; max. temperature 350 °F (177 °C)

Solid plastic bodies (figure no.)

Screwed 1/2" to 2": PVC (2406), CPVC (2416), PVDF unpigmented (2417); socket weld 1/2" to 2": PVDF unpigmented (2427), PVC (2451), CPVC (2463); flanged: PVC 1/2" to 4" (2436), CPVC 1/2" to 2" (2442), PVDF unpigmented 1/2" to 4" (2447); IPS spigot: CPVC 1/2" to 2" (2443), PVC 1/2" to 4" (2486); DIN spigot: PVDF unpigmented 1/2" to 4" (2487)

Solid plastic end connections

NPT threaded; spigot weld (PVC and CPVC: IPS SCH 80; PP and PVDF: DIN 11); socket weld (PVC and CPVC: SCH. 80; PP and PVDF: SCH. 80); flanged to 150# ANSI dimensions (PP and PVDF: ring flange; PVC and CPVC: fixed flanges)

Manual bonnet

903 bonnet assembly standard on 1/2" to 4"; 902 bonnet assembly standard on 6" to 12"; solid plastic bodies take a glass-reinforced PAS (polyarylsulfone) bonnet

Bonnet materials

Cast iron ASTM A-126 Class B; ductile iron ASTM A-395 Grade 60-40-18; stainless steel ASTM A-351 Grade CF8; bronze ASTM B62 Alloy 836; polypropylene (1/2" to 4"); PAS (1/2" to 4")

Bonnet standard equipment

Bronze stem bushing; moulded-in fingers; grease fitting (6" to 12", not used with sealed bonnet); thrust bearing visual position indication; adjustable travel stop (1/2" to 4"); permanently sealed lubrication (1/2" to 4"); clear stem cover (1/2" to 4")

Bonnet and diaphragm sizing

3/4" flanged valve is supplied with 1" bonnet and diaphragm; 1 1/4" valves are supplied with 1 1/2" bonnet and diaphragm

Design standard

MSS SP-88 (diaphragm valves)

Testing

100% seat and shell testing; all valves pressure tested bubble tight before shipment, no visible leakage allowed

Features

Adjustable travel stop prevents overclosure and prolongs diaphragm life; bronze bushing reduces turning torque and enhances cycle life in dirty atmospheres; sealed bonnet offers secondary containment against fugitive emissions, with leak detection port as standard; floating tube nut prevents point loading of the stud on PTFE diaphragms; diaphragm isolates the bonnet's working parts from process fluids; smooth contoured body with minimal pockets, cavities or dead spaces; no packing gland or packing; bubble tight closure to MSS SP-88; in-line maintenance; moulded closed 2-piece PTFE diaphragm shaped to the weir, eliminating delamination, with superior flex life, reduced permeation and excellent chemical resistance; Line-Lok locks the lining at the weir in all plastic lined valves, reducing the potential for liner cracking; extensive selection of body and diaphragm materials and actuation packages

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