The WellMark 2001NB / 2001E Series Cemco Style Pneumatic & Electric liquid level control, designed with a Die Cast Aluminum control box, provides a rugged and 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 allows for a wide range of adjust-ability for a variety of liquid level control requirements. 

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The WellMark Series 1085 WellMark Style Pneumatic Level Control is used to maintain a pre-selected fluid level in a vessel. When the rising level compares with the pre-selected level:
1. The displacer's movement actuates the controls pneumatic pilot valve;
2. The pneumatic pilot valve directs operating pressure to a control valve;
3. Operating pressure opens and closes or throttles the control valve as necessary to maintain the pre-selected fluid level.
Other controls have these operational characteristics, however none share all the noted WellMark standard features.
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The WellMark Series 7400 WellMark Style "Snaptrol" Pneumatic & Electric Liquid Level Control (also known as the Cemco Style LLC) for use in low-pressure vessels or tanks, this versatile and multi optional device can be used as a level control or as a component of Hi-Lo level alarm systems. The 1" NPTM unit may be mounted into a 1" coupling when the float is accessible from inside the vessel. If 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 level in oil and gas production equipment such as separators, dehydrators, treaters, as well as in manufacturing plants, hazardous waste disposal, food processing, petrochemical facilities, or wherever fluid levels need to be monitored or controlled.
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The WellMark Series 1800 The WellMark 1800 Pneumatic & electric Liquid Level Control offers design simplicity, easy installation, adjustment, and reliable liquid-level monitoring. The Model 1800 can be equipped with a snap action 3-way 2-port valve (1800M) and an electrical contact switch (1800E). The Model 1800 is actuated by movable arms that permit the control range to be adjusted easily and accurately set to the range desired. With the liquid level below the float, the 3-way 2-port valve, or micro switch, will be in low level position and will remain there until the float rises to the pre-set high level. The 3-way 2-port valve, or micro switch, reverses positions as the float rises or drops through the pre-set level.
The 1800 Liquid Level Control 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.

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The WellMark Series 6900 WellMark Style Flexlever liquid level controls offer design simplicity, easy installation, adjustment, and reliable liquid level monitoring. It is a highly efficient device for the control of liquid level in oil and gas production equipment such as: separators, dehydrators, and treaters, as well as in manufacturing plants, hazardous waste disposal, food processing, water treatment, petrochemical facilities, or wherever fluid levels need to be monitored or controlled. The sensing element design, with no moving parts exposed to the tank or vessel fluid, makes the simple installation of the control possible in various standard pipe closures such as: ANSI flanges and grooved, or union, connections.
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The WellMark Series PT988 WellMark 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. In addition, it can be switched from direct to indirect action simply by inverting the unit 180°. The PT988 features a 3-way snap-acting pilot (0 to full output using 20-30 psi supply pressure) or order it with an optional throttling pilot (3 to 15 psi output with a 20 psi supply pressure).
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The WellMark Series 9321 WellMark Style On-Off Pneumatic & Electric Liquid Level 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 tight shut-off when the switch is in its normal position (flapper against the nozzle).
The Series 9321E is an external 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 WellMark Series 9321E Electric Switch uses the displacer and torque tube movement to trip and reset an electric switch for on-off condition. The displacer can withstand up to 11/2 times the maximum working pressure, allowing it to remain in the cage during hydrostatic testing.
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The WellMark Series 9311 WellMark Style Pneumatic & Electric Liquid Level Switch is a Hi/Lo Level Switch.  This switch combiones the user-friendly features of our Model 2001NB with the rugged external cage of the Model 9321.  Together these attributes make the 9311 a robust, reliable Level Switch for the control of liquid level in oil and gas production equipent suck as Gas Compressor Scrubbers, Separators, Safety Systems, etc.

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The WellMark Mizer (R) No Bleed Pilot is the most cost-effective solution for converting high-bleed pneumatic controls to low-bleed operation.  This device effectively stops continuous bleed operation between dump cycles, thereby reducing environmentally-concerning methane emissions, while allowing previously wasted gas to be sent to the sale line.  Conservitavely, users can anticipate 90% savings from recaptured gas based upon estimated cycle rates of controls.  95-98% values may be achieved in some applications.

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