Hydraulic operated butterfly valves are a special type of butterfly valve, primarily used in pump outlet and turbine inlet piping systems. They function as both shut-off and check valves, preventing backflow and water hammer, and are widely used in water conservancy, power, and chemical industries.
Based on their actuation method, they are classified into three types: pressure-holding, locking, and accumulator. Pressure-holding and locking types are opened hydraulically and closed using the potential energy of a counterweight; accumulator types use an accumulator instead of a counterweight, resulting in a more compact structure.
The valve's operation consists of three stages: opening, locking, and closing. The hydraulic system drives the butterfly plate to rotate and lift the counterweight to store energy, completing the opening. Mechanical and electromagnetic dual locking ensures stable operation when the valve is fully open. When closing, the valve automatically closes according to preset fast-closing, buffering, and slow-closing programs. The closing speed and angle are adjustable, and manual operation, fault operation, or power failure triggering are supported.
The control system is compatible with both standard mode and PLC intelligent control, enabling local, remote, and computer-connected control, and is equipped with a manual oil pump for emergency operation. Technical parameters cover nominal diameter DN100-4000, pressure 0.25-2.5MPa, and medium temperature ≤80℃. It adopts a triple eccentric structure and uses stainless steel and carbon steel materials to improve sealing performance and durability.
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Hydraulic Operated Butterfly Valve Technical parameters
Size Range:DN50 ~ 1600
Body material: A216-WCB, A351-CF8/CF8M, A351-CF3/CF3M
Connection Options:flange type, wafer type
Working Pressure: PN 16 ~ 40
Working Temperature:-40ºC~+80ºC
Sealing Options:PTFE, flexible graphite
Applicable Medium:Water, Oil, Gas, Air, Chemical Fluids
Hydraulic Operated Butterfly Valve Performance Characteristics and Advantages
Low Operating Torque:
Hydraulic drive amplifies the handwheel torque by 5-60 times, significantly reducing opening and closing torque, especially suitable for large-diameter (DN600 and above) or high-pressure valves.
Excellent Sealing Performance:
Utilizing a triple eccentric metal seal or double eccentric rubber seal structure, it achieves zero-leakage sealing and withstands high temperatures and pressures (≤815℃).
Low Flow Resistance Coefficient:
The valve's flow resistance coefficient is only 0.1-0.8, far less than that of check valves (1.7-2.6), resulting in significant energy savings.
High Degree of Automation:
Supports PLC control, pump-valve linkage, and computer-based control, enabling local and remote operation, meeting Industry 4.0 requirements.
Strong Controllability:
The valve can be closed in two stages, fast and slow, according to a preset program, effectively eliminating water hammer and preventing pump and turbine runaway accidents.
Easy Installation and Maintenance:
Compact structure, lightweight, reducing floor space; simple component composition, convenient maintenance, and reduced operating costs.
Hydraulic Operated Butterfly Valve Specification Parameters
| Standard | Design and manufacturing | Face-to-face dimensions | Flange dimensions | Pressure and temperature ratings | Inspection and testing | Leakage class |
| National standards and industry standards | GB/T12224, GB/T12238, JB/T8527 | GB/T12221 | GB/T91129124, HG/T2059220635, SH3406JB/T79 | GB/T9124, GB/T12224 | JB/T9092, GB/T13927 | GB/T4213 |
| American Standard | API609 | API609 | ASME B16.5, ASME B16.47 | ASME B16.34 | API598 | ANSI/FCI70-2, ASME B16.104 |
| Other national standards | JIS B2002, ISO5752 | EN1092 |
Hydraulic Operated Butterfly Valve Applications
Power Industry:
Used as an emergency shut-off valve in high-safety systems such as steam turbine extraction pipelines and blast furnace gas pressure recovery generators (TRT).
Used in the circulating water systems of thermal power plants to quickly regulate flow and ensure the normal operation of the cooling system.
Water Conservancy and Water Supply & Drainage:
Used as a replacement for gate valves and check valves in pump outlet and turbine inlet pipelines to prevent backflow and water hammer.
Used in large pumping stations of urban water supply systems to precisely control water flow according to water demand and ensure stable water supply.
Petrochemical Industry:
Used to control the flow rate of high-viscosity and corrosive media, such as heavy oil pipelines, to ensure stable operation of the production process.
Used in gas pipeline systems for coal gas, air, and flue gas to regulate flow or as a start-up/shutdown device.
Metallurgical Industry:
Used in blast furnace cooling systems to precisely control the flow rate and pressure of cooling water to prevent damage to the blast furnace due to insufficient cooling.
Other Fields:
Used in the pulping process of paper mills to control the delivery of pulp and chemicals. Distribution stations in long-distance natural gas pipelines regulate the flow and pressure of natural gas.
Process piping systems in pharmaceutical plants control the delivery of high-purity, sterile media, conforming to GMP standards.
Hydraulic Operated Butterfly Valve factory
