# How do you read a valve tag?

## How do you read a valve tag?

The tag itself should identify the valve, usually by showing the valve number. The type of valve and the system the valve is part of typically are identified. For example, the valve tag might read “200# Main Steam Shut Off.” This identifies the valve as the shutoff valve in the 200-pound main steam line.

## What are valve tags used for?

Valve tags are a specific type of tag used to identify the contents and function of a pipe that the tagged valve operates. They are an integral part of any safety system that aims to reduce the risk related to spills, accidents, and injuries from improper use of valves within a facility.

How do I know what size valve I need?

The basic valve sizing equation Q = Cv√∆P can be used to calculate pressure drop, flow rate, or the flow coefficient. For solutions other than water, a correction for a difference in specific gravity of the solution is necessary. This revised formula would be: Q = Cv[√∆P/Sg] with Sg = specific gravity of the liquid.

### How are valves identified?

The tags must identify the valve and usually do so by including the valve number. The tag also typically identifies the valve type and system of which the valve is a part. It’s important to note that the type of valve specified is dependent upon its function rather than on the design of the valve.

### How do you choose a valve type?

1. Choose a valve type depending on your application.
2. Consider your fluid type (liquid or gas) and its characteristics to determine compatible valve materials.
3. Determine the temperature, pressure, and flow rate under which your valve will be operating.

How do you choose valves?

## What does the number in 4 2 valve means?

Example: A 4/2 directional control valve would have four ports and two spool positions. Supply of high-pressure working fluid to be supplied to actuator by the valve.

## How do I choose a valve size?

When sizing a control valve, the rule of thumb is to size it so that it operates somewhere between 20-80% open at maximum required flow rate and whenever possible, not much less than 20% open at the minimum required flow rate.

What is the main purpose of choosing the right type of valve to be used in process control?

This enables the direct control of flow rate and the consequential control of key process parameters, including pressure, temperature and liquid level. Several major types of control valves are available; each has pros and cons and may be most appropriate for different applications.

### What is control valve sizing?

The process of “control valve sizing” is a procedure where the dynamics of the system are matched to the performance characteristics of the valve. This produces a control valve of an appropriate size and type that will best meet the needs of managing flow within the process system.

### What does the numbers in 4 3 valve means?

Specification. Directional control valves are generally specified using the number of ports and the number of switching positions. A hypothetical valve could be specified as 4-way, 3-position direction control valve or 4/3 DCV since there are four ports and three switching positions for the valve.

What do the numbers in 3 2 valve mean?

What The Numbers 3/2 Mean. The first number in the 3-2 type air valve indicates the number of ports the valve will have. The second number indicates the number of positions that the air control mechanism inside this valve can have.

## How do you write the number on a valve tag?

Write on them with a permanent marker. Write the valve number on the tag and then seal the laminating flap to protect the text from smudging and wear. Embossing produces raised characters similar to a license plate.

## What is the size of a valvalve tag?

VALVE TAGS General Information • Each tag shall be attached to the valve assembly (do not place tag on valve handle or wheel) by means of steel wire • Tag Size: 2” x 3”x 1/8” GravoPLY • Tag Color: Color to adhere to FM Piping Identification Key.

How do you identify a valve?

The tags must identify the valve and usually do so by including the valve number. The tag also typically identifies the valve type and system of which the valve is a part. It’s important to note that the type of valve specified is dependent upon its function rather than on the design of the valve.

### What is the ANSI standard for valve tags?

As such, valve tags use the ANSI/ASME A13.1 standard for color coding (a pipe labeling standard followed in the industry for valve labeling purposes due to the lack of a separate standard for valve labeling). The tags must identify the valve and usually do so by including the valve number.