3-Way Air-Operated Diaphragm Valves

Series TUCA miniature valves for corrosive & ultra-pure liquids • Spring holds valve to normally open port; Air Pressure diverts flow to third port

Features:

• Double diaphragm design.
• Compact size; 1/4" NPT is under 4" height.
• Simple and inexpensive method of diverting or sampling harsh chemicals.
• Non-sticking design with bubble-tight seal.
• Available in a variety of body & seal materials.
• Can be used as a selector valve, switching flow between two different "inlets."

Operation

Series TUCA three-way air-operated valves are used todivert flows from a common inlet to either of two outlets.They can also be used in reverse to feed flows from twolines into a common outlet, however, this reverseapplication can only be used with inlet pressures less than15 PSI (1,0 BAR). They are commonly recommended forhandling corrosive or ultra-pure liquids. Compressed air 30 to 100 PSI is required to operate Series TUCA. Air should be filtered and lubricated.

In situations where air pressure is not available, water pressure can be used so long as the pressure available is sufficient to actuate the valve. If hydraulic media is not clean, a filter should be used.

Valves should be mounted upright for best results and less strain on piping.

A three-way solenoid air valve is used to control the flow of air pressure under the air piston to divert the flow from the normally-open port to the normally-closed port. When theair pressure is removed the main valve spring reverses theabove.

Design

The Series TUCA air-operated valve has an air piston witha lower and upper diaphragm separating the liquid fromopposing springs. An internal shaft between thediaphragms shifts the valve position. There is no metal inthe liquid section of the valve. Cycle tests have beensuccessfully run to 500,000 cycles.

Sizes & Materials

These valves are constructed of PVC (Geon® brand Grade 1, Type 1), PP (natural unpigmented polypropylene), TF (PTFE), PF (Kynar® PVDF) with Viton® or EPDM seals. Some components in Polypro and PTFE models are built of PVDF for strength. Stainless steel fasteners are standard and are not in wetted areas. For other materials, please contact the Plast-O-Matic Technical Department at 973-256-3000 or e-mail info@plastomatic.com

Connections, Pressure Ratings

Standard connections are NPT. Optional connections are socket or spigot. Air inlet connection is 1/8" NPT. Maximum air pressure is 100 PSI. Minimum air pressure required to actuate the valve is 30 PSI. Use of an air flow rate valve may be required to prevent water hammer, depending on your application.

Maximum liquid line pressure is 50 PSI. No minimum liquid line pressure is required for successful use of the valve.

Series TUCA Dimensions:

Materials Temperature vs. Pressure Ratings:

N.R. = Not Recommended

Specifications & Ordering Information:

Helpful Links:

3-Way Air-Operated Shutoff Valve ... [.pdf file format]

3-Way Air-Operated Ball Valve ...an alternative to a 3-way globe-patterned valve.

3-Way Electrically Actuated Ball Valve ...ideal for applications where compressed air is not available.

3-Way Manually operated Ball Valve ...for manual diverting or sampling.

Index Page to all Air-Actuated Globe style Valves with a brief description of each. Includes compact valves, diverter valves, valves that use line pressure to open, double-acting valves, and more. This may be the page you used to arrive here.