Overview
The manual hydraulic butterfly valve is a hybrid valve designed for systems requiring both manual control and hydraulic assistance. It bridges the gap between purely manual valves and fully automated systems, offering cost-effective flow control in medium-to-high-pressure applications. The valve's disc rotates 90° within the pipe to start, stop, or throttle flow, while the hydraulic mechanism reduces operator effort for large-diameter valves. Common in DN50–DN1200 sizes, these valves serve industries where occasional adjustments are needed without full automation. Their bi-directional sealing capability and compact flange-to-flange length make them preferable to gate valves in space-constrained installations. The manual override ensures fail-safe operation during power outages, a critical feature in process industries.
Structure and Working Principle
A typical manual hydraulic butterfly valve comprises four main components: the body, disc, stem, and hydraulic actuator. The body houses a circular passageway with flanges for pipeline connection. The disc—often offset or double-eccentric in design—rotates on a stem supported by bearings. The hydraulic cylinder connects to the stem via a lever, multiplying manual input force. Operation involves turning a handwheel or lever, which engages the hydraulic pump to build pressure in the actuator. This pressure assists in overcoming system forces, particularly in high-pressure or large-diameter applications. The disc's position can be locked at any intermediate angle for flow throttling. Sealing is achieved through resilient seat materials (EPDM, NBR) that compress against the disc edge, with metal-seated variants available for high-temperature services.
Key Features
1. **Torque Reduction**: Hydraulic assistance reduces required manual torque by 60–80%, enabling operation of valves up to 48" diameter by a single operator. This is critical in emergency shut-off scenarios. 2. **Bubble-Tight Shutoff**: Advanced seat designs achieve ANSI Class VI leakage standards, with tested sealing pressures up to 150% of rated working pressure. 3. **Corrosion Resistance**: ASTM A351 CF8M stainless steel stems and electroless nickel plating on discs extend service life in aggressive media like seawater or acids. Optional features include position indicators, locking devices for safety isolation, and flange drilling to multiple standards (ANSI, DIN, JIS). The valves typically withstand temperatures from -20°C to 180°C, with high-performance models reaching 400°C using special metal seats.
Application Areas
1. **Water Treatment**: Used in pump discharge lines and filter backwash systems, where hydraulic assist handles water hammer forces. DN300–DN800 sizes dominate in municipal plants. 2. **Oil & Gas**: Manifold isolation in refineries, with API 609-compliant designs for hydrocarbon service. Fire-safe versions meet API 607 standards. 3. **Chemical Processing**: Lined valves (PTFE/PFA) handle corrosive acids at pressures up to PN25. The hydraulic system prevents stem galling in frequent cycling applications. Other uses include HVAC balancing, shipboard piping, and power plant cooling water systems. Their quick operation (typically 10–15 seconds for full stroke) makes them ideal for emergency isolation compared to slower gate valves.
Maintenance and Precautions
**Quarterly Checks**: Inspect hydraulic fluid levels and seals for leaks. Most systems use ISO VG 32 hydraulic oil, with biodegradable options available for environmental-sensitive areas. Lubricate stem bearings with lithium-based grease annually. **Common Failures**: Seal degradation from incompatible media (e.g., petroleum fluids attacking EPDM) accounts for 70% of repairs. Always verify chemical compatibility charts. Disc misalignment due to pipeline stress can cause uneven wear—install with proper pipe supports. For cold climates, use low-viscosity hydraulic fluids and protect external linkages from ice buildup. Never exceed the maximum hydraulic pressure marked on the actuator (typically 70 bar) to avoid diaphragm rupture.
B2B Procurement Guide
1. **Specification Checklist**: - Pressure rating (PN10/16/25 or ANSI 150/300) - End connections (RF flange, wafer, lug) - Material grades (body: ASTM A216 WCB/WCC; disc: 316SS) - Certifications (ISO 9001, API 609, CE/PED) 2. **Supplier Evaluation**: Prioritize manufacturers with in-house testing facilities for hydrostatic and seat leakage tests. Field service support for after-sales maintenance is valuable for large-quantity orders. 3. **Cost Factors**: Prices scale non-linearly with size—a DN600 valve costs approximately 3× more than a DN300 equivalent. Consider total lifecycle costs; premium seals (e.g., Viton) add 15–20% upfront but last 3× longer than NBR in oil service.
Related Manufacturers
- 主营：气动upvc球阀、气动法兰球阀、不锈钢球阀、对夹蝶阀、电动upvc蝶阀、电动对夹蝶阀、电动法兰蝶阀、气动蝶阀、高温蝶阀、法兰球阀、电动球阀、高压球阀、气动调节阀、风阀、气动球阀、衬氟球阀、卫生级球阀
- 主营：气动阀、调节阀、减压阀、气动蝶阀、电动蝶阀、开关蝶阀、电动阀、气动球阀、电动球阀、气动调节阀、电动调节阀、自力式调节阀、自力式减压阀、单座调节阀、流量调节阀、压力调节阀、控制阀、气动切断阀、切断球阀、防爆球阀、防爆阀门、阀门、高压球阀、供氮阀、氮封阀
- 主营：[]
- 主营：刚性防水套管、电气组合套管、柔性防水套管、法兰蝶阀、钢制伸缩器、人防密闭套管、电动气动阀门、法兰软密封闸阀、可调式减压阀、集分水器、止回阀、过滤器、阻尼减震器、排泥阀、过轨管、止水环、通气帽、截止阀、黄铜阀门、法兰弯头、波纹补偿器、橡胶接头、排气阀
- 主营：控制阀、调节阀、角座阀、衬氟蝶阀、气动偏心蝶阀、电动法兰蝶阀、电动蝶阀、气动蝶阀、电动通风蝶阀、毛细管阀、防腐球阀、防火风阀、扇形眼镜阀、电动开关球阀、气动衬氟球阀、高压电动球阀、烟气零泄漏风阀、气动调节阀、电动调节阀、气动球阀、电动球阀、气动控制阀、电动截止阀、高压球阀
- 主营：调节阀、执行器、对焊球阀、塑料蝶阀、对夹蝶阀、电动蝶阀、电动衬氟蝶阀、螺纹球阀、卡箍球阀、对夹球阀、法兰球阀、衬氟球阀、三通球阀、快装球阀、气动球阀、蒸汽阀门、塑料球阀、快装阀门、不锈钢球阀、双由令球阀、对夹式阀门、阀门电动装置、化工专用阀门、电动高压球阀、三通丝扣球阀
- 主营：补偿器、电动脱硫、油冷却器、电动蝶阀、金属软管、电动挡板门、弹簧支吊架、煤粉波纹膨胀节、电动插板隔绝门
- 主营：[]
- 主营：[]
- 主营：[]
- 主营：喷淋塔、布袋除尘器、电捕焦油器、电动通风蝶阀、锅炉布袋除尘器、pp喷淋塔、滤桶除尘器、活性炭吸附箱、等离子净化器、不锈钢气旋塔、光氧净化器、除尘打磨台、旱烟净化器、气旋塔、单机除尘器、星型卸料器、光氧活性炭一体机、催化燃烧一体机、插板阀、离心风机、移动滤桶除尘器、烟雾净化器、酸雾净化塔、除尘布袋、活性炭过滤箱
- 主营：通风蝶阀、烟道波纹补偿器
- 主营：弧形阀、刮板机、厂双层、手动刀、正压星、链条斗、双向压、防卡星、粉空气、扇形阀、调节阀、鸟笼子、异型阀、圆口星、卸料机、下料阀、输送机、百叶阀、拆卸星、315空气、挡板门、铸铁星、拉链机、防爆星、制砂机
- 主营：脉冲布袋除尘器、插板阀、螺旋输送机、通风蝶阀、卸料器、除尘骨架布袋、翻板阀、脉冲阀、除尘器配件
- 主营：盲板阀、陶瓷阀、闸门、蝶阀、卸灰阀
- 主营：中线蝶阀、止回阀、管道法兰、闸阀
- 主营：气处理、活性炭、插板阀、法兰蝶阀、除尘布袋、电磁脉冲阀、滤筒除尘器、焊烟净化器、除尘雾炮机、拼接除尘器、脉冲电磁阀、除尘器骨架、布袋除尘器、螺旋输送机、木工除尘器、工业锅炉风机、催化燃烧设备、吸附脱附装置、废气除尘设备、光氧催化设备、不锈钢调节阀、离子除臭设备、中央除尘设备、工业防尘布袋、下料器卸灰阀、催化燃烧一体机
- 主营：催化燃烧设备、沙克龙除尘器、滤筒除尘器、手动不锈钢蝶阀、布袋除尘器、斗式提升机、仓顶除尘器、脱硫塔、塑烧板除尘器、电捕焦油器、pp喷淋塔、湿式静电除尘器、活性炭吸附箱、静电除油装置、按需定做、卧式酸雾净化塔、在线监测设备、气旋混动喷淋塔、粉尘加湿机、打磨除尘工作台、除尘滤芯、螺旋输送机、无尘散装机、喷漆房、水帘柜
- 主营：自动取样阀、柱塞阀、耐腐蚀取样阀、手动取样阀、电动蝶阀、气动蝶阀、采样阀、柱塞放料阀、无菌取样阀、一体阀、柱塞取样阀、法兰取样阀、沥青取样阀、取样阀门、自复位取样阀、高压取样阀、电动球阀、密闭取样阀、高密封取样阀、气动球阀、QYF、气体取样阀、反应釜取样装置、衬氟取样阀、不锈钢取样阀
- 主营：船用安全阀、船用减压阀、船用油滤器、船用蝶阀、船用液压阀门、船用青铜阀门、船用不锈钢阀门、船用铸钢阀门、船用铸铁阀门、船用自闭阀、船用海水滤器、船用调节阀、船用止回阀、船用截止阀、船用闸阀、船用旋塞、船用球阀
- 主营：脉冲除尘器、除尘滤袋、滤袋骨架、手动蝶阀、手动插板阀、除尘骨架、除尘器骨架、针刺毡布袋、耐高温滤袋、布袋支撑框架、环保不锈钢袋笼、过滤除尘器滤袋、卸料器、星型卸灰阀、电动排灰阀、气动插板阀、滤筒除尘器、补偿器、膨胀节、伸缩节
- 主营：电液动平板闸门、电液动腭式闸门、电液动扇形闸门、电液推杆、电动推杆、液压站
- 主营：电动执行器、电动阀门、电动球阀、不锈钢蝶阀、电动蝶阀、气动蝶阀、船用蝶阀、对夹蝶阀、法兰蝶阀、手动蝶阀、通风蝶阀、塑料蝶阀、软密封蝶阀、脱硫蝶阀、硬密封蝶阀、加长杆蝶阀、伸缩蝶阀、手动球阀、气动球阀、电动闸阀、电动截止阀、电动调节阀、一五阀门、锻钢截止阀、法兰截止阀
- 主营：卫生级止回阀、球阀、视镜、不锈钢蝶阀、快装接头、非标定制
- 主营：脉冲布袋除尘器、除尘滤袋、星型卸料器、通风蝶阀、除尘布袋、针刺毡布袋、耐高温滤袋、插板阀、除尘骨架、滤筒除尘器、塑烧板除尘器、旋风除尘器、翻板阀