Welded Bonnet Gate Valve
Welded Bonnet Gate Valve is a type of industrial valve commonly used to control the flow of fluids and gases. There are several different types of Welded Bonnet Gate Valves, including:
Bolted Bonnet Gate Valve: This type of valve is similar to the Welded Bonnet Gate Valve, but the bonnet is held in place by bolts instead of being welded. This makes it easier to replace the bonnet or repair the valve if necessary.
Pressure Seal Gate Valve: This type of valve is designed to withstand high pressure applications. The bonnet is sealed by a pressure seal that is tightened as pressure increases, creating a stronger seal.
Parallel Slide Gate Valve: This type of valve has two parallel discs that slide back and forth to control the flow of fluid or gas. It is designed for high pressure and high temperature applications.
Wedge Gate Valve: This type of valve has a wedge-shaped disc that is lowered onto the seat to shut off the flow of fluid or gas. It is designed for high pressure and high temperature applications.
The main difference between these different types of Welded Bonnet Gate Valves is their design and intended application. Bolted Bonnet Gate Valves are easier to maintain, while Pressure Seal Gate Valves are better for high-pressure applications. Parallel Slide and Wedge Gate Valves are both designed for high-pressure and high-temperature applications, but they use different mechanisms to control the flow of fluid or gas. Choosing the right type of valve depends on the specific needs of the application.
Product introduction
The opening and closing part of the welded gate valve is a plug-shaped disc, the sealing surface is a plane or a conical surface, and the disc moves linearly along the center line of the fluid. The movement form of the valve stem includes a lifting rod type (the valve stem rises and falls, and the handwheel does not rise and fall), and there is also a lifting rotary rod type (the handwheel rotates and lifts together with the valve rod, and the nut is arranged on the valve body). The bellows globe valve is only suitable for fully open and fully closed, no adjustment and throttling are allowed.
Advantages
The structure is simple, and the manufacture and maintenance are relatively convenient.
The working stroke is small, and the opening and closing time is short.
Good sealing performance, small friction between sealing surfaces, and long service life.
Disadvantages
The fluid resistance is large, and the force required to open and close is large.
Not suitable for media with particles, high viscosity and easy coking.
Poor adjustment performance.
The types of welded gate valves
The types of welded gate valves are divided into external thread type and internal thread type according to the position of the valve stem thread. According to the flow direction of the medium, there are straight-through type, direct-current type and angle type.
According to the driving method, it can be divided into motorised gate valve, pneumatic gate valve, hydraulic gate valve and manual gate valve, all of which belong to automated gate valve.
Welded gate valve is the most widely used valve. The reason why it is popular is that the friction between the sealing surfaces during the opening and closing process is small, it is more durable, the opening height is not large, it is easy to manufacture, and it is convenient to maintain. It is not only suitable for Medium and low pressure, but also suitable for high pressure. Its closing principle is that relying on the pressure of the valve stem, the sealing surface of the valve disc and the sealing surface of the valve seat are closely fitted to prevent the flow of the medium.
Welded gate valves only allow the medium to flow in one direction, and have directionality during installation. Its structural length is longer than that of the gate valve, and at the same time, the fluid resistance is large, and the sealing reliability is not strong during long-term operation.
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