Industrial Manual Valve

• Water Treatment: Municipal water supply networks, interception in sewage treatment plants, and building water supply and drainage.

• Petroleum and Chemical Industry: Isolation of oil and gas pipelines, feed control of reaction kettles, and discharge of storage tanks.

• Power Industry: Boiler feed water systems, steam pipelines, and cooling water circulation.

• Heating, Ventilation, and Air Conditioning (HVAC): Flow regulation in heating/refrigeration systems and equipment isolation.

• Food and Pharmaceutical Industry: Sanitary process pipelines (e.g., ball valves, diaphragm valves).

• Marine Industry: Ballast water systems, fuel oil transportation, and fire-fighting pipelines.

• Metallurgy and Mining Industry: Slurry transportation and compressed air control.

• Fire Protection Systems: Main control valves of fire-fighting water networks.

• Working Principle:

Manual valves drive the valve stem and gate to move through manual operation of the handle or handwheel, thereby controlling the on-off of fluids or regulating flow. Taking the gate valve as an example, its working principle is as follows:

Structural Components: It mainly consists of a valve body, gate, valve stem, and handle. The gate moves vertically in the valve body to control the on-off of fluids.

• Operation Principle:

Opening Process: Rotate the handle to drive the valve stem to rotate, and the gate rises to open the fluid channel.

Closing Process: Rotate the handle to lower the gate, which fits tightly with the valve seat to block the fluid.

Sealing Mechanism: When closed, the gate falls completely and contacts the valve seat, forming a sealing structure to prevent leakage.

• Operation Specifications:

Before the operation, confirm the opening and closing direction of the valve (usually clockwise to close/counterclockwise to open) and check the limit marks.

When closing to the extreme position, turn back 1/2 to 1 circle to avoid jamming.

When operated by multiple people, tools such as levers should be used for assistance to avoid damaging the valve due to excessive force.

• Key Features:

Simple Structure: Few components, low failure rate, and low maintenance cost.

No External Power Required: Relies on manual operation, suitable for power/gas-free environments or explosion-proof scenarios.

High Reliability: No complex control system, with strong long-term stability.

Low Cost: Procurement and maintenance costs are much lower than those of automatic valves.

Emergency Backup: Often used as a bypass or safety redundancy for automatic valves.