Control Valves

SOR Control Valves are designed to be used in rugged, demanding applications in the oil and gas industry. In most cases, the final control element in a control loop is a Control Valve to adjust the flow of fluid in a process. Each design is specifically aimed to provide superior performance and solve industry specific challenges.

SOR recognizes that there is no industry convention with respect to terminology and definitions pertinent to Control Valves. This glossary applies to SOR Control Valves.

Actuation Type – There are two types of action: Reverse and Direct. Reverse is fail closed and direct is fail open.

Adjusting Spring – This is the spring to determine how much force is required to close or open the valve. 

Body – The SOR Control Valves are offered with either globe or tee body styles. The globe style body allows the process fluid to flow either direction – over the trim or under the trim. The tee body has three ports allowing a plug to be placed in one port to change the direction of flow from globe style to angle style body.

Bonnet – The bonnet assembly is the part of the valve body through which the valve plug stem moves.

Diaphragm – The diaphragm is connected to the stem and plug.  When pneumatic pressure is applied to the diaphragm, the diaphragm will lift up or down depending on the actuation type.  This will in turn open or close the valve.

Flow Over/Flow Under – The flow can go in either direction for the valve.  When it is flow over, the flow will travel over the plug and down through the cage.  When it is flow under, the flow will travel up through the cage.

Plug and Seat – The plug and the seat are very important components to the operation of the valve. The surface finish of the plug and seat determines if the valve will seal effectively. The shape of the plug determines the flowing characteristics of the valves.

Travel Indicator – The travel indicator will show how open the valve is.  When the indicator is down, the valve is closed.  When the indicator is up, the valve is open the same amount that the indicator has traveled.

Trim – On/off trim is designed to only allow the valve to be completely open or completely shut. Throttling trim is designed to provide a percentage of full flow capacity at designated pneumatic inputs.


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