The shut-off valve, also known as the cut-off valve, is one of the most commonly used types of valves in various industrial applications. It is widely preferred due to its low friction between the sealing surfaces during operation, which contributes to longer service life. The valve has a relatively small opening height, making it easier to manufacture and maintain. It is suitable for both medium and low-pressure as well as high-pressure systems.
The closing mechanism of a shut-off valve relies on the pressure applied to the stem, which forces the valve disc’s sealing surface against the seat, effectively preventing the flow of the medium. These valves are designed for unidirectional flow, meaning they must be installed with the correct orientation. Compared to gate valves, shut-off valves have a longer structural length and higher fluid resistance. Over time, their sealing performance may degrade if not properly maintained.
Shut-off valves come in three main types: straight-through globe valves, right-angle globe valves, and DC-type oblique globe valves. Each type is suited for different piping configurations and flow requirements.
One of the key advantages of shut-off valves is that the friction between the disc and the seat is lower than that of gate valves, making them more resistant to wear. Additionally, their opening height is typically only 1/4 of the seat diameter, which is much smaller than that of gate valves. Most shut-off valves feature a single sealing surface, simplifying the manufacturing process and making repairs more straightforward.
In terms of specifications, shut-off valves are available with nominal pressures ranging from PN1.0 to 16.0 MPa, ANSI CLASS 150 to 900, and JIS 10 to 20K. Their nominal diameters range from DN10 to 500, or NPS 1/2 to 36 inches. They can be connected via flange, welding, threading, or other methods. These valves can operate within a temperature range of -196°C to 700°C.
Shut-off valves can be manually operated or equipped with various drive mechanisms such as bevel gear, pneumatic, electric, hydraulic, gas-liquid linkage, or electro-hydraulic linkage. The valve body materials include WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), and Ti. Due to the variety of materials, these valves can be used for a wide range of media, including water, steam, oil, nitric acid, acetic acid, oxidizing agents, and urea.
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