Series SW
Limit Switches signal the open or closed position of air actuated ball valves
Features:
- Signals open or closed; with optional Limit Stops is adjustable to any limited open position
- Plastic construction eliminates atmospheric corrosion
- Water and dust-tight housing
- Light weight, dependable design
- Manual override of ball valve
Series SW signals the open or closed valve position for computer verification or to actuate other equipment based on the valve position.
Body material is PVC, seals are BUNA-N, and the assembly fasteners are stainless steel and can be shielded from the atmosphere if necessary. Of course none of these materials in the Limit Switch are in contact with the process liquid.
The Limit Switch has a camshaft and two single-pole double throw switches. A signal line is wired "through" the switch to the equipment or computer being signaled. A 1/2" NPT conduit fitting seals the wiring connection. AC resistive load rating is 10 amps for each contact. DC loads are rated for 60W (5A at 12 VDC, 2.5A at 24 VDC).
The switches make contact when the valve is either open or closed. The open position of the True Blue ball valve is adjustable for throttling by using the optional Series LS Limit Stop. Series SW Limit Switch is also adjustable to accommodate the throttle open position.
Mounting:
The limit switch is simply mounted to the actuator by two screws. These screws are sealed inside the unit. The photo above left shows the Limit Switch mounted on an air by spring actuator. The illustration above right shows what the Limit Switch looks like on an air by air actuator.
Components:
- Mounting screw
- Switch adjustment screw
- 1/2" NPT conduit fitting
- Ball valve closed switch
- O-ring seal (Buna nitrile)
- Cam button
- Ball valve open switch (variable open)
A CAD file in .dwg format is available for Series SW; we invite you to download this file from our CADlink page, which has CAD drawings available for most of our popular products. You may also click here to download the SW file. If you require a dimensional drawing of this product, simply "right-click" the drawings below, and select "save as" from the drop down menu.
Dimensions:
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Helpful Links:
Ball Valves Index Page -- Overview and links to all ball valves, actuators, and accessories.
Series LS -- Accessory Limit Stops for actuated ball valves. Used with Series SW on this page for configuring a throttling control.
Series MBV -- True Blue Ball Valves -- Manual version of Plast-O-Matic's popular ball valve line; constructed with integral mounting lugs for easy addition of an actuator when needed. Features also include Trunnion design, steel reinforced shaft (not in liquid) and Teflon thrust washer. 2-way and 3-way designs. Socket, threaded, flanged ends, NPT, BSP or Metric; customizing available.
Series EBV -- Actuated Ball Valves -- Electrically powered actuators for 2-way and 3-way ball valves, all sizes. Features Standard Manual Override.
Series ABV -- Actuated Ball Valves -- Pneumatically or hydraulically powered actuators for 2-way and 3-way ball valves, sizes 1/2", 3/4", and 1". Air x air and "fail safe" air x spring models available; converts easily between types. Manual override standard.
Air-Operated Diaphragm Valves and Globe Valves- Perhaps your application requires more rapid shut-off, or you want to use line pressure to open the valve, or have other reasons you don't specifically want a ball valve. If so, True Blue ASO, BSD, or BSR is likely to meet your needs.
Series TABV & TABR -- Actuated Ball Valves -- Explanatory page for pneumatically or hydraulically actuated 3-way ball valves, all sizes. For actuator specifications, use the above links for the appropriate size.
Online Pressure Drop Calculator -- Allows you to easily determine the probable pressure drop across a valve. Note: For comparison and illustrative purposes only; not to be relied on for system design.
5 Most Common Mistakes When Specifying Valves
Valve Pressure Loss & Flow - Q&A and Equations
(Explains Cv and Delta P, how to better
specify valves, etc.)