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ZZW Check valve swing type with actuator DN 350-400

Material: carbon steel

Nominal pressure: PN 25

Nominal diameter: DN 350-400

Temperature range: 300°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

Chemical industry

Chemical industry

Heating

Heating

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 swing type disc and servomotor, equipped with limit switch. Proper valve consists of cast steel body and disc, swing type disc. Steering mechanism of swing type disc is connected with servomotor. On the valve there is located scale and on the opposite side – servomotor, consisting of body, piston, spring, stem and limit switch lever (limit switch KW-211), located on the valve’s bonnet.

On the valve bonnet there is situated servomotor consists of body, piston, springs and stem. Limit switch KW-211 is screwed to the valve’s bonnet.

Check valve ZZW allows for one-way flow of steam and protect against return flow. Normally, steam flows from turbine to heater. Servomotor’s spring pushes the stem to upper position. Clutched lever indirect opens the disc of swing type and then – the check valve. Closure of automatic valve causes water supplying with minimum pressure 0,7 MPa to servomotor. Depending on condensate pressure, the valve can be equipped with servomotor of type: SZZ-H5 or SZZ-H7.

Steering

Electric actuator

Electric actuator

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