Do you want to find out a knife gate valve?

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Do you want to find out a knife gate valve?

knife gate valve

In the water treatment systems you are controlling, there seems to be an unstable water system. Read the knife gate valve below, which may give you more ideas.knife gate valve

  1. The names

Gate valve, knife gate valve is called after Penstock, Sluice gate valve, knife gate valve, square gate valve.

  1. Describtion

In wastewater treatment systems or water supply or drainage systems, irrigation water pipes, flood protection systems, spillway systems, municipal sewage systems, etc. People often use knife gate valve or gate valves to regulate large flow, which conventional valves cannot handle.

Knife gate valves.

Knife gate valves have many types, materials are usually made of steel, stainless steel, cast iron, etc. Opened by hand rotary or automatic opening by an electric motor.

On the market valves, there are various types of flanged valves, gate valves, etc. There are a lot of different sizes, sizes from D200 x D200, etc. Up to DN2400 x DN2400, or larger depending on specific projects.

  1. Gate valves, Structure and Operating Principle

Gates valves are opened by lifting a gate out of the liquid path. The distinctive feature of this gates valve is the sealing surface between the gate and the valve seat is flat, so the Knife gates valve is usually used when the fluid flow is straight and the minimum limit is desired.

Gate valves are usually divided into two types: parallel and wedge (V). The gate valves are designed to open or close completely. Gate valves should not be used to regulate the flow unless they are specifically designed for that purpose.

The gate valve are designed in two forms that is the gate valve float and the gate valve sink.

  • The float gate is attached to the gate and they rise and fall below when the valve is operated, a crane rotates around the threaded body and moves it. This type is only suitable for installation on the ground.

The Non – Rising Stem Resilient Seated Ductile Iron Gate Valve

Is sinked into the gate and swiveled with lace rising and lowering inside the valve. They occupy smaller space because the threaded shaft is held in the valve body. Ports with submersible sockets are suitable for both ground and underground installations.


The Non – Rising Stem Resilient Seated Ductile Iron Gate Valve are made according to BS standards, flanges and boulon holes are drilled according to BS4504 standard. The valve is coated with a dark green epoxy paint, corrosion resistant and dust of the surrounding environment.


  • The Knife gate valves used to cut the thick and thick liquid. The design of the knife gate valve makes it self-cleaning, as the knife is for abrasion along with the door contact and seat pads. The knife gate design is thinner than other gate valves, so it is more compact so it is very suitable for this type of valve to be installed in locations that require less space.

Gate valves usually have one of four types of lids, which help seal the valve body. Caps with threaded fasteners are quite simple, the sealing parts have a durability that uses pressure to impact tightness. The Union cap allows for easy access to the valve body for applications requiring maintenance or routine inspections. Boulon set up is commonly used for large valves in higher pressure applications.

Gate valves are designed primarily for shutting off flow. Gate valves are best used in systems requiring the use of infrequent valves. They are designed for full area flow to minimize pressure drop and allow flow through pipes and piping clean. Most of the flow changes occur near the closure, the relatively high fluid velocity causes disc and seat abrasion and causes leakage if the valve is used to regulate the flow.

Knife gate valve is used for many industries gate valve, flange gate valve.
  • Petroleum industry
  • Pharmaceutical industry
  • Manufacturing industry
  • Automotive Industry
  • The maritime industry.
Gate valves can be used for a large number of liquids. Gate valves suitable for the following working conditions:
  • Drinking water, wastewater, and neutral liquids: temperatures from -20 to +70 ° C, maximum flow rates 5m / s and differential pressure 16 bar.
  • Air: temperature from -20 to +60 ° C, maximum flow rate 20 m / s and differential pressure 16 bar.

In fact, the gate valve also has many ways to call the name, but the collective is still only the gate valve, cast iron gate valve or copper gate valve or copper gate in the manner of connecting threaded or flanged connection. Because the design of the valve is like a closed door that is called a gate valve or gate valve and both are familiar.

  1. The connection of the gate valve

There are two types of connection for the gate valve: threaded and flanged. Gate valves from DN50 down and use the form of threaded and the material can be copper or cast iron and from DN50 or more people use flanges.

Hopeffuly, this article will support more information that you need to know about the Knife gate valves. Thank you for your reading.