- Sliding stem. Globe valve – Type of device for blocking or regulating the flow of fluids. Angle body valve. Angle seat piston valve.
- Rotary. Butterfly valve. Ball valve.
- Pinch valve. Diaphragm valve.
What are the three types of valve control?
- Snap Trim (also referred to as Quick-Opening trim)
- Nominal Trim (also referred to as Linear trim)
- Equal Percentage Trim.
How many types of control valves are there?
The two types of control valves are linear motion and rotary motion.
What are control valves?
A control valve regulates the rate of fluid flow as the position of the valve plug or disk is changed by an actuator. Control valves are used to maintain a process variable as close as possible to the desired set point. Controller set points are typically flow rate, pressure, and temperature.
What are the different types of control valve depending on action?
There are two main types of control valve designs, depending on the action of the closure member. These are namely (i) sliding-stem , or (ii) rotary. Sliding-stem valves use linear motion to move a closure member into and out of a seating surface.
What is the principle of control valve?
What are the Working Principles of a Control Valve? Pneumatic Actuated . Pneumatic Actuators use an air or gas signal from an external source to produce a modulating control action . The actuator receives the force of the pneumatic signal through a top port. Then, it distributes the signal across the actuator’s diaphragm ...
How many parts does a control valve have?
An automatic control valve consists of three main parts in which each part exist in several types and designs: Valve actuator – which moves the valve’s modulating element, such as ball or butterfly. Valve positioner – Which ensures the valve has reached the desired degree of opening.
What are the 3 most common control valve flow characteristics?
There are three most common control valve characteristics viz Linear, Equal % and Quick-Opening .
How do I know what type of valve I have?
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 is the control valve trim?
The internal parts of the valve body, stem, seating material, package, disc, plug, back rings, etc. , are collectively referred to as the trim. In other words, all wetted parts which can be removable and replaceable in the valve body are part of the control valve trim.
Where is a control valve used?
Control valves are used in many processes to control flow, pressure, temperature or other variables . The type of valve used will depend on the size of the pipe, the overall pressure that the system operates, the flowing media, process conditions, and other factors.
What is the function of flow control valve?
The purpose of a flow control valve is to regulate the flow rate in a specific portion of a hydraulic circuit . In hydraulic systems, they’re used to control the flow rate to motors and cylinders, thereby regulating the speed of those components. The energy transfer must be equal to the total work done.
What are the types of flow control?
- Gate Valves. Gate valves are general service valves primarily used for on/off, non-throttling service. ...
- Globe Valves. ...
- Pinch Valves. ...
- Diaphragm Valves. ...
- Needle Valves.
What are valve types?
- Ball Valve. Predominantly equipped with quick-acting 90-degree turn handles, these valves use a ball to control flow to provide easy on-off control. ...
- Butterfly Valve. ...
- Check Valve. ...
- Gate Valve. ...
- Knife Gate Valve. ...
- Globe Valve. ...
- Needle Valve. ...
- Pinch Valve.
What is the difference between pressure control valve and flow control valve?
A flow control valve delivers a constant flow whatever the pressure drop through the valve. ... Pressure control valves comprise a mechanism that opens the valve above a predetermined pressure threshold, the pressure at the outlet remaining substantially constant while the flow increases dramatically after valve opening.
