Rising Plug Valves

A Rising plug valves is a rotational motion valve used to stop or start fluid flow. The name is derive from the shape of the disk, which resembles a plug. the process operation is like Needle valve. A plug valve is shown in Figure 1. The simplest form of a plug valve is the petcock. The body of a plug valve is machine to receive the tapered or cylindrical plug. The disk is a solid plug with a bored passage at a right angle to the longitudinal axis of the plug.

In the open position, the passage in the plug lines up with the inlet and outlet ports of the valve Figure 1 Plug Valve body. When the plug is turned 90° from the open position, the solid part of the plug blocks the ports and stops fluid flow. Plug valves are available in either a lubricated or non lubricated design and with a variety of styles of port openings through the plug as well as a number of plug designs.

Plug Ports

An important characteristic of the plug valve is its easy adaptation to multi port construction. Multi port valves are widely use. Their installation simplifies piping, and they provide a more convenient operation than multiple gate valves. They also eliminate pipe fittings. The use of a multi port valve, depending upon the number of ports in the plug valve, eliminates the need of as many as four conventional shutoff valves.

Rising Plug valves are normally use in non-throttling, on-off operations, particularly where frequent operation of the valve is necessary. These valves are not normally recommend for throttling service because, like the gate valve, a high percentage of flow change occurs near shutoff at high velocity. However, a diamond-shape port has been develop for throttling service.

Multiport Plug Valves

Multi port valves are particularly advantageous on transfer lines and for diverting services. A single multi port valve may be install in lieu of three or four gate valves or other types of shutoff valve. A disadvantage is that many multi port valve configurations do not completely shut off flow.

In most cases, one flow path is always open. These valves are intend to divert the flow of one line while shutting off flow from the other lines. If complete shutoff of flow is a requirement, it is necessary that a style of multi port valve be use that permits this, or a secondary valve should be install on the main line ahead of the multi port valve to permit complete shutoff of flow.

In some multi port configurations, simultaneous flow to more than one port is also possible. Great care should be taken in specifying the particular port arrangement require to guarantee that proper operation will be possible.

Plug Valve Disks

Plugs are either round or cylindrical with a taper. They may have various types of port openings, each with a varying degree of area relative to the corresponding inside diameter of the pipe.

Rectangular Port Plug

The most common port shape is the rectangular port. The rectangular port represents at least 70% of the corresponding pipe’s cross-sectional area.

Round Port Plug

Round port plug is a term that describes a valve that has a round opening through the plug. If the port is the same size or larger than the pipe’s inside diameter, it is referre to as a full port. If the opening is smaller than the pipe’s inside diameter, the port is refer to as a standard round port. Valves having standard round ports are use only where restriction of flow is unimportant.

Diamond Port Plug

A diamond port plug has a diamond-shaped port through the plug. This design is for throttling service. All diamond port valves are venturi restrict flow type.

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