Gate Valve

Gate valves are similar to global valves in regulating liquid flow. In addition, the gate valves consist of a valve body, a valve seat and disc (plate), a main shaft, a gland, and a wheel that operates the valve. However, the main difference is the movable disc and the fixed ring.

Two lines cross to form an “X”, this is the symbol of gate type. Actually its symbol looks like the outline of a bow knot. Then two vertical lines connect the endpoints to create a closed shape. As professional fire fighting equipment & fire monitors manufactuer In China, we provide quality hydrant gate valves, remote control fire monitors, and gate valve with flange, rubber closures, etc.

What are hydrant gate valves?

A valve commonly used to control the flow of fire sprinkler system as O&Y gate valves. In additional, O&Y stands for “outer stem and yoke” (As usual insiders also call “outer screw and yoke”). Refer to uses of hydrant gate type, it will throttle the flow of water from a fire hydrant. Then the fire protection valve need to open and close the gate, which is lowered into or raised from the valve. Raising the gate allows water to flow through the valve, while lowering the gate cuts off water flow through the valve. When it fully opens, a typical gate type has no obstacles in the flow path. Actually, this will result in very low friction losses.

Two types of parallel and wedge-shaped

1. The parallel gate valve for fire safe uses a flat gate between two parallel seats. A popular type is the knife type, which is designed with a sharp edge at the bottom of the gate. Reference to gate valve with flange and rubber closure, it may be from DN 80 to 200, and PN16.
2. Fire safe wedge gate type use two inclined seats and a slightly mismatched inclined gate. For wedge gate valves, single plate or double plate actuated, are full-bore valves with two-way sealing.

Features of gate valves

Firstly, the fire protection valves have the highest UL/FM water working pressure rating in the fire industry.

Secondly, No Matter NRS or NSR type gate valves, both of NSR and NRS are high strength ductile iron construction, all stainless steel stem.

Thirdly, gate valves with rubber plate provide the highest strength and corrosion resistance.

Difference Between Gate Valves And Global Valve

Globe valves are unidirectional and are best used in applications where pressure changes are not an issue. However, gate valves are a multi-way valve especially suited for applications where low pressure drop is critical.

The landing valve is a type of globe valve that is designed specifically for use in fire protection systems. A landing valve is a type of valve commonly used in fire protection systems. Particularly, landing valve is typically found in multi-story buildings, where it is installed on each floor. So that landing valve provide a connection point for firefighters to attach their hoses and access the building’s water supply.