 Overview
For many years now, GESTRA controlvalves of the type ZK have given proof of their reliability under extreme operating conditions. Long experience and know-how form the sound basis for a generation of efficient and tight-closing control valves for applications in power stations. Thanks to the easy maintenance and repair of the valaves as well as the extremely high wear resistance afforded by the design, reliable operation is achieved together with a long service life.
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ZK Control valves are suited for various fundamental applications in industry and power stations:
- Feedwater tank
- Main feedwater pump
- H.P. preheater
- Boiler plant
- Turnine plant
- H.P. bypass station
- I.P. bypass station
- Condenser
- Condensate pump
- L.P. Preheater
Features and benefits :
- Excellent sealing and control characteristics
- Extremely wear resistant
- Valve designed on modular assembly principle
- Low sound level
- Easy assembly and inspection of nozzle insert
- Leakage-free pressure balanced design
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 Changing Valves Characteristics using the ZK29 as an example
Variable Valve characteristics
For the ZK Control Valves, stage nozzles are available with linear or equal-percentage characteristics. A subsequent change is possible by repositioning throttling sleeves (orifices) or by exchanging the complete nozzle insert.
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