Valve types pdf

Valve Types and Features. The three basic functions of valves are: 1. To select the correct valve to fulfill these functions properly, an outline of the different types of valves and their features is given below. Basic Types by function.

Check valve or non-return valve , allows the fluid to pass in one direction only.

Flow control valve to maintain and control a variable flow rate through the valve. Poppet valve commonly used in piston engines to regulate the fuel mixture intake and exhaust. Diaphragm valves (commonly known as a Saunders, after a popular brand name) work on the principle of a rubber diaphragm or bladder opening and closing. Saunders valves are ideal for restrictive or flow control duties (ie valve half closed to reduce flowrate).

In piping following types of valves are used depending on the requirements. And the cost of a given type and size of the valve can vary 1. It means that if you choose ball valve over butterfly valve for the same function. Chapter covers valve and actuator types.

Most commonly used are plate valves , ring type valves and poppet valves. Depending on the application different types could be used for a recip compressor. A device used for the control of fluid flow, consisting of a fluid retaining assembly, one or more ports between end openings and a movable closure member which opens, restricts or closes the port(s). A valve with a rotary motion closure member consisting of a full ball or a segmented ball. These are more specific types of valves, used only in particular fields or applications.

Often they are subcategories of the classification by operating principle and by function. What are the different types of mechanical valves? A wide range of solenoid valve types are available depending on your specific application requirements. The various functions of a solenoid valve depend on the type of valve you have, and the operation you need the valve to perform. There are many valve designs and types that satisfy one or more of the functions identified above.

A multitude of valve types and designs safely accommodate a wide variety of industrial applications. Regardless of type, all valves have the following basic parts: the body, bonnet, trim (internal elements), actuator, and packing. Closure is obtained by driving a taper wedge gate between two similar taper wedge seats.

Steel wedge gate valves are classified by wedge type : plain solid wedge, flexible solid wedge (having a groove cut around the circumference, and split wedge (two separate halves). Class 1gate valves consist of a square joint in 2” and an oval one for all other sizes. Class 3and 6valves consist of a circular spiral wound gasket.

Class 9and above gate valves consist of a ring type joint.

GlobalSpec offers industrial buyers over valve varieties, each with a unique method of control, function, or media application. They are designed such that if the air supply fails, the control valve will be either fully open, or fully close depending upon the safety requirement of the process. This pressure varies from 0. In gate valves, the closing member is a metal gate. Gate valve is a sliding type of valve. The gate slides down to close the valve.

In fully open conditions, the flow area is equal to the area of the pipe and hence, there is negligible pressure drop across the valve. With a good shut off ability, available in tee, wye and angle patterns and easy to machine the valve seats - its easy to see why they are so popular.