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Unloader Valve (Manual / Solenoid)

Unloader valves suitable for continuous cycling applications, gas or liquid. Features a unique piston seal design. Ideal for batch processing where rugged, high cycle service and minimum maintenance is required. Can be supplied with control valve (electric, pneumatic, hydraulic), plus other accessories. Excellent choice for emergency shutdown (ESD) applications.


·         Electric or pneumatic control (remote or local operation)

·         Soft seated (Elastomer)

·         2-way or 3-way solenoid

·         Optional filter & isolation valve

·         Full or reduced bore orifice

·         Bubble tight seating and re-seating

·         Integral flange design

·         Carbon steel body with corrosion resistant trim



·         Emergency shutdown (ESD)

·         High cycle rates

·         Long service life

·         Explosion-proof controls

·         Minimal installation & maintenance 


Connection Sizes

Custom sizes & dual outlet bodies available on request

1.5” x 2” - 12” x 16”

(38mm x 50mm - 300mm x 400 mm)

Set Pressure Ranges

See F70U Catalog for orifice specific ratings

5 – 285 psig

(.35 – 19.6 barg)

Temperature Ranges

-65 to 400°F

(-54 to 204°C)

Orifice Area Range

1.770 – 111.87 in2

(1142 – 72174 mm2)

End Connections

Custom types available on request


Female NPT (1.5” x 2” size only)

Integral ASME RF Flanged (150# inlet/outlet)

Materials of Construction

Custom available for service or on request

Carbon Steel w/ aluminum trim

Aluminum (1.5” x 2” size only)

Seat Materials

Custom available for service or on request


Buna-N, Viton® (FKM) or equal, EPR/EPDM,


·         ISO 9001-2015

·         Independent cycle testing