In the water supply systems of water plants and pump stations, issues such as medium backflow, pipeline water hammer, and seal leakage are the core hidden dangers that affect operational safety and efficiency. The hydraulic controlled slow closing check butterfly valve, with its three eccentric structure, bidirectional zero leakage sealing, and intelligent hydraulic control system, has become a key equipment for solving such problems, especially suitable for complex working conditions in water plants and pump stations. This article combines material advantages, performance characteristics, and application scenarios to provide users with comprehensive selection references

1、 Hard core material and structure: dual guarantee of sealing and durability. The reliable performance of the liquid controlled slow closing check butterfly valve is derived from the precise selection of core component materials and innovative design of the three eccentric structure: 1 Material selection: Suitable for water quality and high-pressure conditions in water plants

Valve body and butterfly plate: Made of cast steel WCB material, formed by integral casting process, with a tensile strength of ≥ 485MPa, capable of withstanding long-term impact of high-pressure water system, without deformation under 2.5MPa working pressure, ensuring structural stability.

Sealing system: The butterfly plate sealing ring adopts a combination structure of stainless steel 304+EPDM – stainless steel 304 resists chloride ion corrosion in water (suitable for water plant tap water, surface water and other media), EPDM rubber provides elastic sealing, and maintains sealing performance at water temperatures of 0-80 ℃; The surface of the valve seat is welded with hard alloy STL (hardness ≥ HRC55), which improves the anti sand erosion performance by 4 times and solves the problem of sealing failure caused by wear of traditional valves.

Valve stem and transmission components: The valve stem is made of stainless steel 2Cr13, which has undergone quenching and tempering treatment and has a bending strength of 600MPa. Combined with high-strength bearings, it can withstand the maximum load of the valve stem and ensure no jamming during frequent opening and closing; The shaft seal adopts a replaceable packing structure, which can maintain sealing durability after long-term use.

2. Three eccentric structure: The core technology of this valve is to achieve frictionless sealing and flexible opening and closing. The three eccentric design completely solves the sealing and wear problems of traditional butterfly valves

First eccentricity: The axis of the valve stem and butterfly plate sealing surface is offset, reducing the friction area during opening and closing and lowering the operating torque;

Second eccentricity: The centerline of the valve stem and valve body is offset, causing the butterfly plate to first detach from the valve seat and then rotate when opening and closing, achieving frictionless contact between the metal butterfly plate and the valve seat to avoid scratching the sealing surface;

Third eccentricity: The sealing surface of the butterfly plate is offset from the axis of the valve stem, forming a “wedge effect”. The closer it is to the fully closed position, the greater the sealing pressure. Combined with a multi-level metal composite sealing structure, it achieves bidirectional zero leakage sealing (in accordance with ANSI B16.104 Level VI standard), and supports full pressure differential opening and closing, adapting to pressure fluctuation scenarios in water plant pump stations.

2、 Core Performance: Full dimensional advantages from sealing to intelligence. The performance design of the hydraulic control slow closing check butterfly valve directly meets the core requirements of water plants and pump stations, balancing safety and intelligence: 1 The bi-directional zero leakage and all condition adaptive valve achieves bi-directional sealing and zero leakage through the combination of STL hard alloy valve seat and 304+EPDM sealing ring. Even under extreme working conditions such as pump start stop and pipeline water hammer, it can prevent medium backflow. For example, in the outlet pipeline of the clean water tank in a water plant, it is possible to avoid mixing of clean water with raw water due to valve leakage, ensuring the quality of water supply. 2. Intelligent operation and status monitoring

Non invasive intelligent structure: adjustment, debugging, and fault diagnosis can be completed through external panels without disassembly, reducing maintenance downtime;

Rotating operation panel: supports 90 degree rotation, adapts to the viewing and operation needs of different installation orientations of pump stations, and improves on-site convenience;

Real time status feedback: The panel dynamically displays parameters such as torque percentage, valve opening, pressure, etc., combined with position indication devices and limit mechanisms, to accurately grasp the operating status and facilitate timely detection of abnormalities such as jamming and overload.

3. Variable frequency speed regulation and water hammer elimination

Multi stage speed regulation: equipped with variable frequency speed regulation function, the opening and closing speed can be set in multiple stages (such as fast opening slow opening, fast closing slow closing), adapting to the water supply flow requirements of different time periods in the water plant;

Intelligent slow closing design: Automatic slow opening and closing are achieved through a hydraulic control system, combined with fast and slow closing functions (fast closing time 0.5-2 seconds, slow closing time 3-10 seconds, can be optimized according to pipeline parameters), effectively eliminating water hammer impact and protecting pump station pipelines and pump units. For example, in a pump station with a head of 50 meters, it has been calculated that setting fast shutdown for 1 second and slow shutdown for 5 seconds can reduce water hammer pressure by more than 60%.

3、 Hydraulic and control system: A stable and reliable power core. The hydraulic control system is the “heart” of valve slow closing and intelligent control, and its configuration and performance directly affect operational stability Core components and parameters

Power configuration: power supply AC380V (driving oil pump motor), control power supply AC220V (supporting PLC linkage), solenoid valve voltage DC24V (low power consumption, explosion-proof adaptation);

Key components: integrated manual pump (emergency operation), high-precision oil pump, explosion-proof motor, etc. Each component has undergone 1000 hours of continuous operation testing to ensure stable functionality. The manual pump can quickly open and close the valve in case of gas/power interruption, ensuring emergency water supply to the water plant.

2. Safety and linkage guarantee

Power loss protection: When power is lost, the valve automatically closes to prevent the medium from flowing back out of control, in accordance with the safety regulations of the pump station;

Linkage control: The electrical control unit consists of a local control box, execution monitoring components, and remote signal interfaces, supporting seamless integration with the water plant PLC system (Modbus protocol). After installation and on-site debugging, it was confirmed that the remote linkage is normal and can be incorporated into the SCADA system of the water plant for centralized monitoring.

4、 Adaptation scenarios and customized services: The hydraulic controlled slow closing check butterfly valve is designed specifically for water plants and pump stations to meet their actual needs. Through customized services, installation and adaptation difficulties can be solved

1. Advantages of scene adaptation
Core requirements for application scenarios: Solution for hydraulic controlled slow closing check butterfly valve
The water supply pipeline of the water plant is sealed in both directions, ensuring water quality safety and eliminating water hammer. It is equipped with 304+EPDM sealing and fast/slow closing function to avoid pollution and pipeline impact
Intelligent monitoring, emergency operation, PLC linkage non-invasive panel+manual pump+remote signal interface for urban water supply pump station, adapted to automated scheduling
The sewage treatment plant enhances the corrosion and wear resistance of the pump outlet, with STL overlay valve seat and triple eccentric structure for full pressure differential opening and closing, adapting to sewage medium and pressure fluctuations

2. Customized services
On site investigation and size adaptation: A professional team will go to the site to measure the flange size and installation space, ensuring that the valve is perfectly matched with the mechanical connection of the original pipeline flange (such as PN16/PN25);

System compatibility debugging: Debug communication parameters based on the existing PLC protocol of the water plant to ensure that valve status signals are smoothly connected to the central control system without the need to modify the original control architecture;

Design with replaceable vulnerable parts: The valve seat and sealing ring adopt a replaceable structure, so there is no need to replace the valve as a whole during later maintenance, reducing operation and maintenance costs.

The hydraulic controlled slow closing check butterfly valve, with its core advantages of bi-directional zero leakage sealing, intelligent operation, and water hammer elimination, has become an ideal choice for fluid control in water plants and pump stations. Whether it is equipment selection for new water plants or upgrading and renovating old pumping stations, their reliable performance and customized services can meet actual operational needs.