What is expanding gate valve?

What is expanding gate valve?

The valve is equipped with a wedge and segment. The system achieves its positive seal capacity by mechanically expanding the gate and segment against the seats due to the thrust exerted by the stem. In both in closed and open position, the expansion creates a tight seal against the upstream and downstream seats.

What is the use of the gate valve?

Gate valves are used to shut off the flow of liquids rather than for flow regulation. When fully open, the typical gate valve has no obstruction in the flow path, resulting in very low flow resistance.

What are the advantages of gate valves?

The Main Advantages of Gate Valves

• Gate Valves Have Low Fluid Resistance.
• Gate Valves Provide Superior Sealing Performance.
• Gate Valves Have a Wide Application Range.
• Gate Valves are Bidirectional.

What is a double expanding gate valve?

Double expanding gate valves are made by two sliding pieces consisting of a gate and a second segment (male and female wedge segment). Sealing is achieved in both high and low pressure conditions by expanding the gate and the segment out towards the seats while the wedge is in a closed position.

How does a rising stem gate valve work?

Rising-stem valves are those valve designs that are operated by pushing or pulling the valve stem. The valve stems do not rotate, thus the valve stems are threaded and matched to a stem nut that converts the rotational output motion of the motor actuator to linear movement of the valve stem.

Which motion we can observe in gate valve?

Gate valves are designed for fully open or fully closed service. They are installed in pipelines as isolating valves and should not be used as control or regulating valves. Operation of a gate valve is performed doing an either clockwise to close (CTC) or clockwise to open (CTO) rotating motion of the stem.

What are the advantages and disadvantages of gate valves?

In general, gate valves cannot be used for regulating flow rate. It can be used for low temperature low pressure or high temperature high pressure, and can be used according to the different material of the valve. However, gate valves are generally not used for conveying mud and other media in the pipeline.

What is an advantage of a gate valve over butterfly valve?

Advantages. They can provide an unobstructed flow in the fully open position so pressure loss is minimal. They are bi-directional and allow uniform linear flows. No residues are left in the pipes. Gate valves can withstand higher pressures compared to butterfly valves.

What is the importance of the valves in the production industry?

Valves serve a variety of purposes in the industrial, engineering, manufacturing and scientific communities. The main purpose of a valve is to control media flow through a system. The valve may be used to start, stop, or throttle the flow to ensure safe and efficient operation of the process.

What are valves used for in oil and gas?

Gas valves are flow control devices that play an essential role in any piping system. They are used in the oil and gas industry to handle, regulate and control the flow rates of gases such as natural gas, oxygen and liquefied petroleum.

What are the different designs of a gate valve?

Types of Gate Valves Solid Wedge Gate Valve. Solid wedge is the most common & widely used disk type because of its simplicity and strength. Flexible Wedge Gate Valve. The flexible wedge is a one-piece solid disk with a cut around the perimeter. Split wedge or Parallel disks Gate Valve.

What is a MJ valve?

MJ stands for Mechanical Joint. It is a type of compression joint designed for underground connection for pipe, valves and fittings.

What is a pressure seal gate valve?

The pressure seal gate valves supplied by Metals Valve are mainly used in high temperature & high pressure applications such as power-plant steam service. The pressure sealed bonnet-body joint is a more positive way of sealing compared to its bolted bonnet counterparts because the internal pressure of the valve is used for bonnet sealing.