Process Control Valves

Ball Valves

are the most common type of process control valve. They are simple to operate, have a wide range of flow rates and are a specific type of ball valve designed for precise flow control in industrial processes.

Process control ball valves offer accurate throttling capabilities, making them suitable for applications where precise regulation of fluid flow is essential.

What makes process control ball valves different? The ball is typically equipped with a flow-controlling trim, such as a V-port or a segmented ball, to achieve more precise throttling.

Gate Valves

are used to control the flow of fluids in pipelines. Gate valves are another type of widely used control valve in fluid systems. They are mainly designed for two positions: fully open or fully closed, they are not recommended for flow control or throttling applications. Gate valves function by raising or lowering a gate or wedge-shaped disk to control fluid flow. They are known for their fast and complete shut-off capabilities and are widely used in various industries for their reliability and bi-directional flow characteristics.

Check Valves

are used to prevent the flow of fluids in the reverse direction. They are usually used in applications where the fluid flow needs to be unidirectional. When selecting a check valve for a specific application, factors like flow rate, pressure, fluid type, and temperature must be taken into account.

Proper sizing and installation are essential to ensure the check valve functions correctly and provides reliable protection against backflow. There are several types of check valves, each with its own unique design and applications.

Some common types include:

Swing Check Valve which utilizes a hinged disc that swings open when the fluid flows in the correct direction, and closes to prevent backflow;

Ball Check Valve which uses a ball-shaped closure element that is pushed away from the seat by forward flow and returns to seal the seat when flow reverses;

Lift Check Valve which employs a piston-like disc that lifts off the seat when fluid flows forward and settles back to the seat when flow reverses or Diaphragm Check Valve which uses a flexible diaphragm that flexes open with forward flow and reseals with backflow.

WOG (Water, Oil, Gas) Valves

are suitable for use with fluids under specific working conditions: Water, Oil, and Gas WOG). These valves are often used in a wide range of applications, such as plumbing systems, oil and gas pipelines, industrial processes, and various fluid-handling systems. They are typically used in applications where the fluid is flammable or explosive.

WOG isn’t a specific type or design of valve but refers to the valve’s suitability for handling these specific fluids. There are many types of valves, such as ball valves, gate valves, globe valves, check valves, etc that can be designated as “WOG valves” as long as they are rated and tested to handle the pressures and temperatures associated with water, oil, and gas applications.