Dia-Flo® Straightway Diaphragm Valve

Conventional straightway diaphragm valve for slurry, abrasive and corrosive service: the streamlined, unobstructed flow path keeps solids from lodging in cavities and lets the valve be rodded through in either direction. Bodies come unlined in cast iron, ductile iron, stainless or cast steel, rubber lined in soft rubber, hard rubber, neoprene or chlorobutyl, or ETFE and polypropylene lined, sized 1" to 12" depending on body. PVDF and white epoxy coatings protect the exterior.

Size range

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

Body construction

Unlined metal, rubber lined, plastic lined

Unlined metal body materials

Cast iron ASTM A-126 Class B; ductile iron ASTM A-395 Grade 60-40-18; stainless steel ASTM A-351 Grade CF8M; cast steel ASTM A-216 Grade WCB

Unlined metal bodies (figure no.)

Flanged: cast iron 1" to 12" (2811), ductile iron 1" to 12" (2812); raised face flanged: stainless steel 1" to 8" (2813R), cast steel 1" to 8" (2815R)

Unlined metal max. temperature

225 °F (107 °C) for all unlined metal configurations

Rubber lined bodies (figure no.)

1/8" minimum lining thickness. Cast iron 1" to 12": neoprene #7 (2831), soft rubber #5 (2833), hard rubber #10 (2834), chlorobutyl #16 (2836); ductile iron 1" to 12": neoprene #7 (2840), soft rubber #5 (2841), hard rubber #10 (2842)

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. 1" to 8": ETFE on cast iron (2829), polypropylene on cast iron (2838), ETFE on ductile iron (2859)

Plastic lining max. temperature

ETFE 225 °F (107 °C); polypropylene 200 °F (93 °C); temperature may decrease dependent upon media, pressure and valve size

Exterior coatings

PVDF, white epoxy

Manual bonnet

902 bonnet assembly with indicating stem, bronze bushing, lubrication fitting, cast iron bonnet shell and handwheel

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

Can be rodded out in either direction; unimpeded flow; negligible pressure drop; self-draining when piping is pitched; conventional rather than reduced port design, avoiding the reduced Cv, higher velocity, higher pressure drop and accelerated wear of a reduced port; 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; diaphragm isolates the bonnet's working parts from process fluids; no packing gland or packing; bubble tight closure to MSS SP-88; in-line maintenance

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