APPLICATION
Combined Check Butterfly Valve with Weight-loaded Hydraulic Actuators, also called Hydraulic control butterfly valve with counter weight is opened by hydraulic drive and closed by potential energy of counter weight. It is used to substitute to gate valve and check valve, and is given low fluid resistance coefficient, making it an energy-saving product.
Combined Check Butterfly Valve with Weight-loaded Hydraulic Actuators are used where ever valves installed at critical points of pipe networks have to close or open in a secure and reliable manner even if failure of external operating energy. Weight-loaded actuators can be used in emergency valves for closing or opening the valve in emergency conditions independent of
electrical power.
It is closed by quick and slow stages, firstly quick close and then slow close. According to different working conditions, the time and angle of quick and slow close may be adjusted.
Hydraulic system is provided with automatic pressure sustaining and automatic reset functions upon opening, performed as dual protection for valve opening.
Electrical control may be ordinary control and PLC control responding to customer’s requests to carry out the in-line action between pump and valve, or spot remote control and computer integrated control. When the hydraulic control butterfly valve is cancelled with the counter
weight, can be changed into energy storage type flow control valve.
The electrical control system for valves equipped by weight loaded-hydraulic actuator include of:
- Local control cabinet including of PLC planning system, contactors, timers & connection terminals.
- Limit switches & pressure switches.
- Electrical motors for hydraulic pump.
- Connection cables.
DESIGN FEATURES
- Quick close and slow closing
- Automatic control, Electrical control, PLC control
- Polished disc edges to prevent damage to the seat
- Sealing seat made of stainless steel welded and micro finished
- Minimal pressure drop due to the hydrodynamic design of the disc
- Bidirectional flow (for PN10)
- Stainless steel stem
- Mechanical position indicator
