
In order to operate the valve, we need to understand the actuation system that operate the valve from within. First, what is valve? It’s a mechanism to regulate, direct or control the flow of fluids such as gases, liquids, and solids by either open, close, reduce or increase the flow. The main question is, how the operating type works to operate the valve?
The main purpose is to activate the valve by actuating the system that enable or disable the mechanical device to regulate the flow and pressure on its system, whether it operates manually or automatically. The mechanism can also relieve pressure from a piping system or from pressurized vessels. There are 4 operating types for the valve:
1. Handwheel
A common type of manual actuation that can be used to override the valve’s pneumatic machine to either the fully open or closed positions. It may also assert a limit stop to the valve stem which prevent stem motion beyond a certain position.
2. Lever
A manual actuation that can be actuated by hand to direct compressed air and simply control the flow in quick response times. It’s easy to install on various industrial applications and durable to withstand hazardous condition.
3. Gear
Unlike handwheel type, the gear converts the turning force to rotate the stem and it make much simple to control the flow. Gear is generally less expensive if it compared to actuator and much more immune in a fragile environment.
4. Actuator
A non-manual actuation that directs force when a various elements are usually supplied to the valve’s system. Actuator provides precise control of the valve without the requirement of manual operation and made it as an integral part of the piping system from within. It has a variety type of actuators such as electric, pneumatic, hydraulic, and electro-hydraulic.
The valve cannot be operate on its own without its actuating device so that the mechanism can maintained the piping system from within. It’s very crucial for the valve to operate by manual-backed or electric-backed actuating system in order to control the valve.
References :
Aziz, Musadiq. 2013. Valve Actuator.
https://www.reidsupply.com/en-us/industry-news/complete-guide-for-valve-handwheels
https://valveman.com/blog/types-of-valve-handles-lever-and-handwheels/
https://control.com/textbook/control-valves/control-valve-actuators/