VHB and VHBS Bypass Valves for Feedwater Heaters
High-performance bypass valves for feedwater heaters
In thermal power generation, the feedwater heater transfers heat from extraction steam to preheat feedwater, improving overall plant efficiency. When the feedwater heater malfunctions, a bypass system is used to isolate the heater and allow maintenance without disrupting the feedwater flow to the boiler. The VHB and VHBS bypass valves form the core of this system, consisting of two on/off valves placed upstream and downstream from the feedwater heater with separate conduits for routing the flow.
- Body manufactured from fully machined forgings.
- Two on/off valves for easy feedwater isolation.
- Built-in water hydraulic actuation as standard for smooth operation.
- Three-way valves available for specific applications.
- Optional actuation: electrical, pneumatic, or external water hydraulic systems.
Product Specifications
Valve type
- VHB, VHBS
Selection
- Contact sales agent for sizing tool
Pressure class
- Up to ANSI-4500 (higher ratings may be achieved on request)
Actuator type
- Water hydraulic, pneumatic, electromechanical
Leakage class
- ANSI class III (against bypass line)
- ANSI class V (against feedwater heater)
Regulatory standards
- NP 6-10 – 16
- ANSI CI.15
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