GET VALVE SYMBOLS INFORMATION

Valve Symbols

There are two types of valve symbols — first, generic symbols, and second, a symbol with a modifier. Generic symbols will tell you that there is a valve in the line, but they will not tell you about the type of valve. Whereas the valve symbol with a modifier will tell you the type of valve used in the pipeline.

Generic symbols of Valves

Butterfly Valve Symbol

The symbol of the butterfly valve is composed of two vertical parallel lines, with a diagonal line extending from the top of the first line to the bottom of the second line (P&ID symbol).

The two solid horizontal lines by the sides of the vertical lines indicate that butterfly valves are two-way inline valves used for flow control, either on/off or throttling. In the center of the two vertical lines and the middle of the diagonal line is a solid circle.

Similar to a globe valve symbol with two diagonal lines crossing themselves, the butterfly valve symbol is the only symbol where a full triangle is not used. Isometric symbols are used in isometric drawings.

Types of Butterfly Valves

Depending on disc closure design, connection design, and actuation method, Butterfly valves can be categorized into several types.

• • Based on the Disc Closure Design

    • • Concentric Butterfly Valve

        • • Single-Offset

    • • Eccentric Butterfly Valve

        • • Double Offset

            • • Triple Offset

• • Based on the Piping Connection

    • • Lug type
    • • Wafer Type
    • • Flanged Butterfly Valve
    • • Butt-welded Butterfly Valves for high-pressure applications

• • Based on the Operation method

    • • Manual Actuation
    • • Lever Operated
    • • Gear Operated
    • • Automatic Actuation

        • • Electric
        • • Pneumatic
        • • Hydraulic

• • Based on Seat Material

    • • Soft Seated
    • • Metal Seated

Gate Valve Symbol

A gate valve will open or cut off the flow of water through a pipe. They typically have a wheel handle that gets turned to operate the metal disk that blocks the flow.

Its symbol looks like the outline of a bowtie with two straight lines crossing each other to form an “X”. Then two vertical lines connect the ends to create an enclosed shape.

Types of Gate Valve

There are three ways to classify the gate valve.

• • Types of Disk

    • • Solid taper wedge
    • • Flexible wedge
    • • Split wedge or Parallel disks Valve

• • Types of Body Bonnet Joint

    • • Screwed Bonnet
    • • Bolted-Bonnet
    • • Welded-Bonnet
    • • Pressure-Seal Bonnet

• • Types of Stem movement

    • • Rising Stem or OS & Y Type (Outside Stem and Screw Type)
    • • Non-rising Stem type

Globe Valve Symbol

Globe valves, which are not ball valves, are mainly used to regulate flow. Their name from their exterior’s typically round shape, although newer globe valves do not always have a round exterior. They consist of a plane that is horizontal with respect to the pipeline. This plane will have an orifice. A plug of some form being lowered into this orifice is how flow is regulated.

Types of Globe Valve

• • Types of Body Shape

    • • Tee Pattern
    • • Y Type
    • • Angle Type

• • Types of Body Bonnet Joint

    • • Screwed Bonnet
    • • Bolted-Bonnet
    • • Welded-Bonnet
    • • Pressure-Seal Bonnet

Swing Check Valve Symbol

The symbol of the check valve can vary slightly from company to company. Normally any one of the following check valve symbols is prevalent in industries.

Check Valve P&ID Symbol

Types of Check Valves

Depending on the movement of the closure member, various types of check valves are available.

• • Swing Check Valve

• • Wafer Check Valve

• • Spring Loaded Check Valves

• • Spring Loaded Inline Valves

• • Spring Loaded Y

• • Ball Check Valves

• • Diaphragm check valves

• • Lift check valve

• • Stop check valve

• • Foot Valve

• • Duckbill Valve

• • Dual Plate Check Valve

Balancing Valve Symbol

The balancing valve is during which the heating system and cooling systems are running. The static balancing valves and dynamic balancing valves create hydraulic balance.