Published : 10/30/2017 02:41:43
If you’ve got a project in front of you that will involve working with pressure systems, you’ve come to the right place. This guide is designed to give you a basic idea of the function of Masoneilan control valves within a pumping or other pressurized system. More than nearly any other industrial system, pressurized systems demand care and safety at every turn. Improperly constructed or maintained systems can lead to injuries, property damage, and hours of wasted labor. This characteristic is why so much time and innovation has been applied to developing quality components for the regulation of fluid flow and the safe venting of extraneous pressure. Understanding and education is the first step to both workplace safety and a well-functioning system. Masoneilan control valves are only one component of a safe system, but a solid understanding of them should not be overlooked. This article can act as a baseline for learning about control valves.
What is the Definition of a Control Valve?
Control valves are devices that help specifically control the flow of a fluid, generally at the direction of a remote controlling station of some type. Control valves are unique from other types of valves in that they allow for variable states of flow between fully open and fully closed. Control valves are almost always controlled by an actuator of some type, most commonly an air-actuator. Hydraulic and electric actuator control valves do exist but are generally less popular due to the additional external hookups that are required to operate such actuation systems.
Control Valves have three parts that make up the core of their anatomy. The actuator is the first of these parts. The second part is the body, which contains the method of flow limitation. There are many types of control valve bodies used depending on the needs of the system. The final part of a control valve’s anatomy is the positioner, which is a component that helps to monitor and guarantee the level to which the valve is allowing flow.
Control valves are reasonably simple in their purpose, and as a result, have two control states and two fail-safe states. The control states involve calibrating the valve to open more in response to increased pressure or electrical current or to close more from increased pressure or current. The fail-safe states are similar; one failure to safety mode involves shutting the valve if no pressure or electricity reaches the control valve while the other mode involves opening the valve if no pressure or electricity reaches the control valve.
What Are the Types of Control Valve Bodies?
There are a number of types of bodies that can be used to create a viable control valve, however, the most common types are ball, butterfly, pinch, globe, and angle seat piston. Each of this is described below:
1. Ball Valve
a. Ball valves, as their name portrays, are constructed using a ball which has a hole drilled through the middle encased in an enclosure that allows the ball to make a seal when turned into the off position. The ball is rotated such that the hole through the center either faces the wall of the enclosure, stopping flow, or such that the ball partially or fully aligns with the openings in the enclosure, allowing flow of fluid.
2. Butterfly valve
a. Butterfly valves function very similarly to ball valves, instead utilizing a disk that rotates instead of a ball. Controlling the butterfly valve involves rotating the disk to either block off the pipe or to sit sideways allowing flow through the enclosure.
3. Pinch Valve
a. Pinch valves are generally used with flexible tubing and involve a mechanism that pinches the tubing to block flow. They work well as control valves because the pressure of the pinch can be changed to restrict fluid flow to varying degrees.
4. Globe Valve
a. Unlike their name may seem to imply, globe valves are very different than ball valves. Globe valves involve using a plug to block flow within a globe-shaped chamber. The plug is connected to a motor system of some type that allows the plug to be lifted in and out of a hole within the globe-shaped chamber. Fluids flow into one side of the chamber and are let through at variable rates by the lifting and lowering of the plug.
5. Angle Seat Valve
a. Angle seat valves, or angle seat piston valves, involve an angled piece of piping that contains a perforated wall and a piston connection. The piston is able to raise and lift a seal from the perforation in the wall, allowing or preventing flow of fluid through the perforation.
Each of these control valve bodies has differing strengths and weaknesses, but understanding how they are constructed can give you an incredibly helpful insight to the system you are working on. Additionally, if you are able to identify what type of Masoneilan control valves your system contains, you can continue learning more in-depth specifics about that type of valve.
If you need help locating a type of valve or replacement parts for a control valve, reach out to us today! Our shop is staffed by experts who can help you get what you need to get the job done. Visit today at www.industrialzone.com!