Gate Valve Functions & Types
What is a Gate Valve & how does it work?
Specialityvalve is the best Gate Valve Manufacturer in India. Chemical, petrochemical, energy, pulp, paper, and oil and gas processing are just a few of the sectors that employ these goods. There are a variety of valves to choose from. Gate valves are often made in India. A hand wheel, a valve T-Key, or an actuator are used to control it. It receives rotational energy from the mounted wheel. For closing, the hand wheel rotates, turning the threads of the gate stem into the gate and vice versa. For subterranean gate valves, an extension spindle is placed to allow operations without direct access to the valve.
A gate valve with a non-rising stem is known as a non-rising stem gate valve. A Non Rising Stem Gate Valve is also known as a Rotating Stem Gate Valve or a Blind Stem Wedge Gate Valve. The stem of this type of valve does not move up and down when the gate is opened and closed. We can’t determine if the gate is open or closed by looking at the valve because the stem isn’t visible. In that they may be used in the same applications as the Rising Stem Gate Valve, these valves are comparable. They take up a little amount of space in the system and are suited for applications involving both high pressure and high temperature.
The kind of gate Valve is Rising Stem. On rising stem gate valves, the threads are found on the exterior of the valve body. The valve stem rises as we open it. Rising stem valves are often constructed of cast or forged steel, whereas non-rising stem valves are typically made of brass, bronze, or cast iron. In high-pressure applications up to category 2500 or 420 bar, rising stem gate valves are employed. It enables us to determine the extent to which the valve is open. It’s easy to see if a rising stem gate valve is open or closed because of the quantity of visible stem. When the handle is flush with the pipe, the valve is closed. If there is a lot of stem visible, the valve is open.
The body-bonnet joints seal improves as the internal pressure within the valve increases, which is a unique characteristic of the pressure seal bonnet. The pressure seal bonnet is distinguished by the fact that it ends in a downward-facing cup that fits within the valve body. The petrochemical sector, steam circuits, boiler circulation, oil and gas applications, and power plants are the most common uses. The edges of the cup are pressed outward when the internal pressure in the valve rises. Improving the seal between the body and the helmet. Other designs that rely on external clamping pressure to produce a seal in the body-bonnet junction are prone to leakage.
Bellow Seal Gate Valve
The flow of liquid in a pipeline is controlled by gate valves, which can open and close. In these Bellow Seal Gate Valves, a rising stem is attached to a hand wheel, which is connected to a lengthy bellow. Although the bonnet bolts are normally substantial, they are easy to handle. Bellow seal gate valves are energy efficient, feature a simple body that promotes dual flow direction and causes minimal pressure loss, are designed and qualification tested for high pressure/temperature use, and are utilized in the petroleum, chemical, and electric power industries.
As the obturator, they use a wedge-type gate that swings to shut parallel to the mating body seat. They’re comparable to ball valves in that they provide adequate flow but are limited by wear and tear. When compared to globe valves of equal size, the flow rate is three to five times higher. This reduces the time it takes to fill tanks and trucks and saves money on cryogenic liquefied gas transportation. Is utilized in the oil and gas business, as well as the steam and chemical industries, as well as the water and waste water treatment industries.
Forged steel gate valves are sturdy, compact, and ideal for high-temperature applications. The Forged Steel Gate Valves are unaffected by even the most harsh situations. The medium travels through the valve while it is open, making it excellent for enterprises that need to separate viscous fluids and liquids. The valve has an outside screw as well as a yolk with a rising stem. For both isolation and control functions, the hand wheel is used to operate the gate valve. These valves offer positive tight shutdown in the horizontal or vertical position for process media in pipelines. They can also be used to regulate the flow of steam, gas, or liquids.
Double Disc Gate Valve
Double disc gate valves have two gates that open in the middle to allow flow in both directions. They are used for bidirectional flow control. These valves are suitable for applications requiring bidirectional flow control without the need for a separate check valve. These gate valves are often used in sewage systems, wastewater treatment plants, and drainage systems.
Knife Gate Valve
Knife gate valves have a sharpened edge on the gate, which acts like a knife to cut through and control the flow of highly viscous or solids-laden fluids. They are effective for handling thick and abrasive materials and provides a tight seal. Knife Gate Valves are used in pulp and paper mills, mining operations, and wastewater treatment facilities.
Electric Actuated Gate Valve
Electric actuated gate valves are gate valves equipped with an electric actuator for remote or automated operation. They provide remote control and automation, improving operational efficiency and control accuracy.
Pneumatic Actuated Gate Valve
Pneumatic actuated gate valves are gate valves with a pneumatic actuator that uses compressed air to open and close the valve. They offer rapid response and precise control. They are suitable for applications requiring quick valve operation like chemical, petrochemical, and mining industries.
Available Materials: Carbon Steel A216 WCB/A105,WCC, Low Carbon, Steel LCB,LCC, Alloy St A217 WC6,WC9,C5, C12, Stainless Steel A351 CF8, CF8M, CF3, CF3M, CF8C, Duplex Steel A890 GR.4A GR.5A, etc.
Nominal Pressure: PN10-PN450
Size: 1/2” – 64”
Operations: Gear operated, Hand wheel, Electric and Pneumatic actuated
Ends: Flanged, Butt-welding, Socket-weld, Threaded.
Each type of gate valve has its unique characteristics and advantages, making them suitable for specific applications based on factors such as pressure, temperature, flow direction, and automation requirements. Proper selection of the gate valve type is important to ensure reliable and efficient operation in a given application.