Product Details

DIRECT OPERATING DIAPHRAGM VALVE

The R-K DDV series direct operating diaphragm valve features a compact thermoplastic valve designed for most harsh chemicals, DI water and high purity applications. Double diaphragms (primary: Teflon, back-up: reinforced EPDM). Pneumatic control to open and spring to close. No metal contact with fluid. High Cv rating.

Direct acting full flow with top entry for easy maintenance and minimum water hammer. The standard valve is normally closed (apply air to open). Normally open valve is also available upon request.

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Seals :- EPDM, VITON, KALREZ,

Valve Sizes

1/4" 1/2" 3/4" 1" 1 1/2" 2"

Direct operating diaphragm valve

Double diaphragms (primary: Teflon, back-up: reinforced EPDM)

Pneumatic control to open and spring to close

No metal contact with fluid

High Cv rating

Direct acting full flow with top entry for easy maintenance and minimum water hammer. The standard valve is normally closed (apply air to open). Normally open valve is also available upon request.

Type 1	Normally Closed	Most popular style. Fail-safe closed. Air pressure to the 1/8” top port opens the valve. Removing pressure allows the spring to close it.
Type 2	Normally Open	Fail-safe open. Air pressure to the top port closes the valve. Removing pressure allows the spring to reopen it.

Test data was performed with 68°F water and 160 PSIG maximum pressure.

Performance curves may change with higher viscosity liquid and/or higher temperature.

Customers should consult sales reps or the manufacturer for custom products or special applications.

Metrail	Temperature
OTHER	0°F-340°F
POLYPRO	0°F-180°F
PVC	0°F-140°F
PVDF	0°F-280°F
TEFLON	0°F-340°F

¼” to 1” Valve FNPT

All valves are fully ported

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