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ZZW Check valve with actuator

Material: G17CrMo5-5

Nominal pressure: PN 25-64

Nominal diameter: DN 100-300

Temperature range: 420°C

Working position: horizontally/vertically

Check valve are assembled on the pipelines, transmitting heating steam from turbine to regeneration heater. They have to protect turbine against steam return flow from pipeline and heaters.

Application

Industry

Industry

Shipbuilding industry

Shipbuilding industry

Chemical industry

Chemical industry

petrochemistry

Petrochemical industry

Sewage

Sewage

Gas

Gas

Heating

Heating

Glycol

Glycol

Industrial water

Industrial water

Diathermic oil

Diathermic oil

Industrial oils

Industrial oils

Steam

Steam

Compressed air

Compressed air

Neutral fluids

Neutral fluids

Power engineering

Power engineering

Valve ZZW consists of proper check valve with loose disc, connected with piston and of servomotor, equipped with limit switch. Proper valve consists of cast steel body and disc, being connected with piston. On the valve bonnet there is situated servomotor, consisting of body, piston, springs and stem. Limit switch KW-211 is screwed to the valve bonnet.

Check valve ZZW allows for one-way flow of steam and protect against return flow. Normally, steam flows from turbine to heater. During this flow, pressed springs, located under servomotor piston, push down the special nut to the valve’s bonnet. In result, the disc becomes free from actuator’s stem pressure and has possibility to opening the valve. In the event of pressure drop, disc has possibility to close the valve. Actuator ensures the fully tightness of closure. Closure of automatic valve causes water supply with min. pressure 0,7MPa to servomotor. Pressing of water on servomotor piston is higher than spring’s forces and this causes displacement of piston and stem. Displaced stem press disc to the seat and it ensure tightness of valve closure. Depending on pressure of condensate, valve can be equipped with servomotor of type: SZZ-H5 or SZZ-H7.

PN [w bar] Tmax [°C]
ZZW H-5 DN 100 64 420
ZZW H-7 DN 100
ZZW H-5 DN 150 45 420
ZZW H-7 DN 150
ZZW H-5 DN 200 25 420
ZZW H-7 DN 200
ZZW H-5 DN 250 25 490
ZZW H-7 DN 250
ZZW H-5 DN 300 25 430
ZZW H-7 DN 300

Steering

Electric actuator

Hydraulic / pneumatic actuator

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DATA SHEETS