Heavy Hammer Pressure-Maintaining Butterfly Valve: Complete Operational Guide
A Heavy Hammer Pressure-Maintaining Butterfly Valve is a hydraulically controlled valve designed for reliable flow regulation and critical water hammer protection in pipelines. Here is how it operates.The main Butterfly Valve product names of China Butterfly Valve Network include:Hydraulic Control Butterfly Valve,Water Hammer Prevention Valve,Two-Stage Closing Butterfly Valve,Pressure-Maintaining Butterfly Valve,Quick/Slow Closing Valve,Emergency Off Butterfly Valve,Pipeline Safety Valve,Adjustable Closing Time Valve.
Opening Process and Pressure Control
When the valve opens, the solenoid valve shifts, starting the oil pump. Hydraulic oil moves through the flow control valve into the cylinder, pushing a piston connected to a lever. This lifts the heavy hammer, rotating the disc to the open position. The opening speed is adjustable from 10 to 90 seconds via a handwheel.
Upon reaching the fully open position, an automatic pressure-maintaining system activates. The motor charges a pressure accumulator. Once the high-pressure set point is reached, the pump stops. If system pressure drops to a lower set point due to minor leakage, the pump restarts automatically, ensuring the valve remains ready for immediate closure.
Two-Stage Closing for Water Hammer Prevention
The closing process is engineered in two stages to prevent damaging pressure surges (water hammer):
Quick Close Phase: Approximately 70% of the travel occurs rapidly (adjustable from 2 to 25 seconds), swiftly stopping the bulk of the flow.
Slow Close Phase: The final 30% of closure is completed slowly and smoothly (adjustable from 6 to 90 seconds), gently cushioning the remaining fluid column.
This adjustable two-stage mechanism effectively absorbs shock energy, safeguarding pipeline integrity. Both the closing angles and phase durations can be tuned on-site to match specific system requirements.
Key Features for Control and Safety
Mid-Stop Function: Allows the valve to be halted at any intermediate position during opening or closing, a vital feature for precise system testing and setup.
Manual Backup Operation: In case of power loss or pump failure, a hand pump enables full manual operation to open the valve and maintain system pressure. A separate emergency release valve also allows for closure using the stored energy of the hammer and line pressure.
Conclusion and Application
In summary, this valve type offers intelligent, energy-efficient flow control with robust, built-in water hammer protection. Its combination of automatic hydraulic operation, wide-ranging adjustability, and failsafe manual controls makes it a highly reliable choice for medium to large pipeline systems where safety and system longevity are paramount.
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