Electric Stop Valve

The electric shut-off and control valve (also known as an electric stop valve) is a valve device driven by an electric actuator as its core power source. Through motor-driven valve stem operation, the valve core (disc/plug) moves up/down or rotates to achieve on/off control and flow regulation of pipeline media. It is widely used in fluid conveying systems across industries such as petroleum, chemical processing, power generation, water treatment, and metallurgy. Its core functions are to precisely shut off media flow and stably regulate flow rate, ensuring the safe operation of process systems.

Core Features

1. High Degree of Automation & Precise Control

- Equipped with intelligent electric actuators supporting remote control and automatic regulation; can be integrated into PLC and DCS control systems for unmanned operation.

- Modulating electric stop valves offer high-precision flow control capability with regulation accuracy of ±1% to ±3%, precisely matching process parameter requirements.

- Some models integrate position sensors and torque protection devices for real-time feedback of valve core position and operating status, preventing overload or sticking faults.

2. Excellent Sealing Performance & Reliable Shut-Off

- Valve core and seat are designed with hard seals (metal-to-metal) or soft seals (rubber, PTFE). Hard seals are suitable for high-temperature and high-pressure conditions, while soft seals achieve leakage Class VI (zero leakage), effectively preventing media leakage.

- Valve seats are lapped and polished for tight fit with the valve core, ensuring no dripping during shut-off. Suitable for applications with stringent sealing requirements (e.g., toxic, flammable, or corrosive media).

3. Wear & Corrosion Resistant – Adaptable to Complex Conditions

- Valve body materials can be selected based on media characteristics: Q235 carbon steel, 304/316/316L stainless steel, Hastelloy, Monel, etc., offering strong corrosion resistance.

- Valve core and stem are made of wear-resistant alloys (e.g., Stellite) or surface-hardened (e.g., nitriding, ceramic spraying) to resist erosion and wear, extending service life.

- Capable of withstanding high temperatures and adapting to various media types.

4. Easy Operation & Stable Performance

- Supports manual/electric dual-mode switching; manual handwheel operation is available during power outages or failures to ensure continuous system operation.

- Electric actuators feature overload protection, limit protection, and over-temperature protection to prevent equipment damage.

- Compact structure with convenient installation and maintenance; valve stem utilizes packing seals or bellows seals to minimize media corrosion of the actuator.

5. Wide Adaptability & Flexible Functionality

- Various structural forms available (straight-through, angle, three-way) to suit different installation scenarios.

- Available in two types: on-off type (ON/OFF control only) and modulating type (flow regulation). On-off type offers fast response, while modulating type provides good linearity, meeting different process requirements.

Main Application Scenarios

1. Petrochemical Industry: Crude oil, refined products, chemical raw materials (e.g., acid/alkali solutions, organic solvents) conveying pipelines – for media shut-off and flow regulation, ensuring feed control for reactors and storage tanks.

2. Power Industry: Thermal, nuclear, and hydroelectric power systems – steam pipelines, feedwater pipelines, and cooling water pipelines for shut-off and flow regulation, suited for boiler feedwater, turbine cooling, and other processes.

3. Water Treatment Industry: Raw water, clean water, and wastewater conveying pipelines in waterworks and sewage treatment plants – for water distribution, pump station discharge pressure regulation, and media control in treatment processes.

4. Metallurgical Industry: Cooling water, hydraulic oil, and steam pipelines in steel and non-ferrous metal smelting, as well as blast furnace gas and oxygen pipelines – for shut-off and flow control.

5. Building Materials Industry: Hot air pipelines and fuel conveying pipelines in cement and glass production lines – for precise temperature and flow regulation to ensure kiln combustion efficiency.