A gate valve is basically a controlling device that is fixed on the pipes. It includes a round handle on the thicker section of the pipes. These valves are highly essential as it helps to control the flow of liquid. It either helps to stop or start a linear flow of water or any other type of liquid.
It is usually seen on pipes in commercial buildings, factories and even homes. It is used for a wide variety of liquids and semi-liquids as it is quite efficient in its sealing properties.
Gate Valve- Classification According to Wedges
Different valves utilize different types of wedges and each valve is distinguished accordingly. The following sections describe some of the important classifications.
The flexible wedge valve: These valves include both one-piece and twin-piece disc to alter the angle in between the seats. The wedge valves are quite flexible and can be found in different varieties. One of the most commonly used flexible wedge valve is the parallel side valve which is used in the stem valves. These valves can expand and contract as it has the ability to withstand the varying climatic conditions.
Solid wedge valve: Gate valve with a solid wedge can be used for all types of liquids. It is suitable for turbulent flow as it is strong with a simple construction. With a solid construction in a single piece, these wedge valves are widely used in many areas.
Split wedge valves: These wedges are used mostly for corrosive liquids and non-condensing gas. This wedge type includes two pieces which is positioned between the tapered seats in the body of the valve.
Classification According to Stem
Gate valve is also classified according to the type of stem. Stem is the device which connects the disk and the hand wheel of the valve. According to the stem the valves are classified as follows:
The rising stem valve and the Non-rising stem valve
Rising stem valve: This particular stem valve includes a threaded shaft which can be rotated using a hand wheel. The stem rises when the valve is opened which helps to identify the position of the valve. When the gate valve is closed, the stem descends.
Non-rising stem valve: Another type of stem valve includes the non-rising stem valve where the stem remains stationary. There is no upward movement even when the valve is opened. It is used in underground tunnels and places where there is little or no space.
Basic Advantages of using Gate Valve
There are many benefits of using these valves as it helps to restrict the flow of water.
Bi-directional: These valves can be used in both directions. Therefore it is considered to be quite efficient in quick controlling of the flow of liquid.
Excellent sealing properties: It is widely used for its tight sealing properties. It shuts down the flow of liquid completely.
Minimum loss of pressure: Another advantage of using these valves includes the minimal loss of pressure through the valves. It therefore seldom affects the durability of the pipes and ducts.
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