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Process Control Valves and Instrumentation Products > Automated Diaphragm Valves > Metal Unlined Diaphragm Valves > Ductile Iron Diaphragm Valves (Unlined) > Screwed End Automated Ductile Iron Diaphragm Valves (Unlined) > Item # 1/2"/17-2-T/A  
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Item # 1/2"/17-2-T/A, Screwed End Automated Ductile Iron Diaphragm Valves (Unlined)



Wide Selection — available in a wide variety of body materials, linings and end connections. By utilizing such highly resistant linings as Saran, Polypropylene, Kynar, Tefzel, Glass, Rubber, etc., virtually any chemical service within the pressure/temperature limits of the valve can be handled safely and economically.

No Stem Leakage — since the diaphragm isolates the fluid stream there is no need for a packing gland — no atmospheric contamination, no leakage or waste, no expensive maintenance of stem, seats or stuffing box.

Bubble-Tight Shut Off — results when the downward thrust of the stem and compressor assembly molds the flexible diaphragm against the weir. The diaphragm will accommodate itself to rust, scale, slurry, or fibrous material.

Streamline Flow — with minimum pressure drop because of the absence of grooves, pockets or sharp changes in direction of flow.

Cost Saving — simple in-line maintenance. In less time than it takes to remove and replace a conventional valve, a new body diaphragm can be installed. Thus providing essentially a brand new valve at a tiny faction of the cost of a new or repaired conventional valve — all without removing the valve body from the line.

Flow Control — the automated diaphragm valve provides an excellent means of handling the changing flow requirements in most process installations. By the addition of a positioner to the actuator, even more precise control can be achieved, especially in the handling of slurries, or viscous and fibrous materials.

Body Materials — available in cast iron, ductile iron, carbon steel, stainless steel, Alloy-20, aluminum and bronze




Specifications  · Diaphragm Selection  · Standard Actuator Features

Specifications

Body Material
Ductile Iron

Temperature Range
-30 to 300 ºF

Typical Applications
Maximum resistance to aggressive chemicals and solvents at elevated temperatures. Excellent anti-stick properties.

Lining Options
Unlined

Material/Lining Classification
Metal Unlined

End Connection

End to End Dimension A
2 1/2 in

Valve Size [Fraction]
1/2 in

Valve Size [Decimal]
0.50 in
12.70 mm

Diaphragm Control Valve Options
730-RV, Pilot Operated Controller Option

Line Pressure Conditions1
0% P.D
100% P.D.

Weight
5 lb
1 100% P.D. means that downstream pressure falls to 0 psig.

0% P.D. means that downstream pressure remains at, or returns to essentially the same as the upstream pressure.


Diaphragm Selection

Diaphragm Material
PTFE Faced

Diaphragm Material Description
TFE PTFE - over the years, a broad range of elastomeric and plastic diaphragms have been developed which will successfully handle all aggressive fluids, gases and slurries, as well as food, beverage and pharmaceutical products where F.D.A. approval of materials of construction is required. The TFE faced diaphragm is backed with fabric reinforced elastomer to provide the high chemical and temperature resistant qualities of TFE with flexibility for longer life and tighter shut-off.


Standard Actuator Features

Actuator Size Number
0, Actuator Size "0"
1, Actuator Size "1"
2, Actuator Size "2"
2A, Actuator Size "2A"
3, Actuator Size "3"
4, Actuator Size "4"
5, Actuator Size "5"

Action of Actuator1
1 The choice of actuator size is determined by the line pressure through the value and the available operating air pressure. Some operating conditions call for substantial line pressure downstream when the valve closes.

After the valve closes, if the downstream pressure is less that 30 % of the upstream pressure - this condition is 100% Δ P. If the downstream pressure is 30% or more of the upstream pressure - the condition is 0% Δ P.


 MORE IMAGES 

·  TFE/Rubber Backed


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