Pneumatic Controls

2001NB

This liquid level control is designed with a die-cast aluminum control box; it provides a rugged a versatile unit that is ideal for use on compressor scrubbers, separators and any production or process units that require liquid level control. Its proportional band and spring-balanced displacement element allow for a wide range of adjustment for a variety of level control requirements.

1085

This control is used to maintain a preselected fluid level in a vessel. When the rising level compares with that of the desired level, the displacer's movement actuates the control's pneumatic pilot valve. The pilot valve directs operating pressure to a control valve, which then uses operating pressure to open/close or throttle the control valve as necessary to maintain the preselected fluid level. Other controls have these operational characteristics. However, none share all of the WellMark standard features.

7400 Snaptrol

Also known as the Cemco Style LLC, the Snaptrol is for use in low-pressure vessels or tanks. This versatile and multi-optioned device can be used as a level control or as a component for high-low level alarm systems. The 1" Male NPT unit may be mounted into a 1" coupling when the float is accessible from inside the vessel. If the float is not accessible, a 2" or larger connection must be provided to allow passage of the float through the connection. The pneumatic 3-way 2-port no-bleed pilot valve makes this unit an excellent choice for the control of liquid levels in oil and gas production equipment such as separators, dehydrators, treaters, and for manufacturing plants, hazardous waste disposal, food processing, petrochemical facilities, or wherever fluid levels need to be monitored or controlled.

1800

This level control offers design simplicity, easy installation, adjustment, and reliable liquid-level monitoring. The Model 1800 can be equipped with a 3-way snap-action, 2-port valve (1800M) and an electrical contact switch (1800E). It is actuated by movable arms that permit the control range to be adjusted easily and accurately set to the range desired. With the level below the float, the micro switch will be in low-level position and will remain there until the level rises to the pre-set high level. The micro switch reverses positions as the float rises or drops through the pre-set level. The 1800 can be used in oil and gas processing, manufacturing plants, hazardous waste disposal, food processing, petrochemical facilities, or wherever fluid levels need to be monitored or controlled.

6900 Cantilever

Cemco's Cantilever Style LLCs offer design simplicity, easy installation, adjustment, and reliable liquid-level monitoring. They are highly efficient devices for the control of liquid levels in oil and gas production equipment (such as separators, dehydrators and treaters), as well as in manufacturing plants, hazardous waste disposal, food processing, petrochemical facilities, or wherever fluid levels need to be monitored or controlled. The sensing element design, with no moving parts exposed to the fluid, makes the simple installation of the control possible in various standard pipe connections, such as ANSI Flanged, Grooved, or Union style ends.

6900 Flexlever

The Flexlever design offers the same basic usage and connection styles as the Cantilever in a slightly different lever design.

PT988

This style Pneumatic Level Switch is designed for horizontal mounting in a tank or vessel through threaded or flanged pipe connections (will work in an API 2" full coupling) and is excellent for applications where space is a factor. It can be externally caged for vessel isolation and can be used as a high or low level alarm, as well as a liquid level control. It can be switched from direct to indirect action simply by inverting the unit 180 degrees. The PT988 features a 3-way snap-acting pilot or an optional throttling pilot.

Series 9321

This on-off switch operates shut-down valves or alarm systems when liquid in a vessel reaches a predetermined level. This switch uses an externally mounted displacer that operates a nozzle-flapper to vent the supply pressure when the switch is activated. The nozzle-flapper has a soft seat for thigh shut-off when the switch is in its normal position (flapper against the nozzle). The 9321E is an externally cage-mounted electric liquid level switch. Rising liquid exerts a buoyant force on the displacer, producing a torque in the tube. This force will either trip or reset an electrical switch. Falling liquid will trip or reset the same switch if so desired. The displacer can withstand up to 1-1/2 times the working pressure, so it can remain in position during hydrostatic testing.