Intro4u2u

A Gate Valve, or Sluice Valve, as it is sometimes known, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar. The gate faces can form a wedge

Choke valve

A choke valve is valve that lifts a solid cylinder (called a “plug” or “stem”) up and down which is placed around or inside another cylinder which has holes or slots. The design of a choke valve means fluids flowing through the cage are coming from all sides and that the streams of flow (through

Globe valve Description

Globe valves are named for their spherical body shape. The two halves of the valve body are separated by an internal baffle which has an opening forming a seat onto which a movable disc can be screwed in to close (or shut) the valve. In globe valves, the disc is connected to a stem which

eedle valve

A needle valve is a type of valve having a small orifice and a threaded, needle-like plunger. It allows precise regulation of flow, although it is generally used for, and is capable of, only relatively small flow rates. A needle valve has a relatively small orifice with a long, tapered, conical seat. A needle-shaped plunger, on …

pilot valve

A Pilot valve is a dead man’s switch which requires a human operator to hold it in the mid-position and take some action if the operator takes off pressure or applies full pressure. Often (especially in heavy rail applications) this type of fail-safe braking is provided with one foot and one hand control to reduce

A poppet valve is a valve consisting of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem. The shaft guides the plug portion by sliding through a valve guide. In most applications a pressure differential helps to seal the

The sleeve valve is a type of valve mechanism for internal combustion piston engines which have traditionally relied on the more common poppet valve.
A sleeve valve consists of one or more machined sleeves that fit within a piston engine’s cylinders and are designed so as to move so that their openings align with the cylinder’s

Reed valves consist of thin flexible metal or fiberglass strips fixed on one end that open and close upon changing pressures across opposite sides of the valve much like heart valves do. They are intended to restrict flow to a single direction. Reed valves are commonly used in two-stroke engines to control the fuel-air mixture that

A rotary valve is a type of valve in which the rotation of a passage or passages in a transverse plug regulates the flow of liquid or gas through the attached pipes. The common stopcock is the simplest form of rotary valve. Rotary valves have been applied in numerous applications, including:

A piston valve is a device used to control the motion of a fluid along a tube or pipe by means of the linear motion of a piston within a chamber or cylinder.
Examples of piston valves are: The valves used in the valve gear of many stationary steam engines and most steam locomotives.

A saddle valve is a valve used to supply liquid where a low volume, low pressure stream is required. The name is derived from the fact that it is mounted in such a way that it “saddles” the line, mounting it from both sides. They are typically used for suppling cold water, via a 3/8 in.

Safety valve

A safety valve is a valve mechanism for the automatic release of a gas from a boiler, pressure vessel, or other system when the pressure or temperature exceeds preset limits. They are often called by more specific names such as pressure relief valves, T&P valves, or temperature and pressure relief valves.afety valves were first used

Relief valve

The relief valve is a type of valve used to control or limit the pressure in a system which can build up by a process upset, intrument or equipment failure or fire, by allowing the pressurised fluid to flow from an auxiliary passage out of the pressure vessel. The relief valve is designed or set