Pilot-Operated, Normally-Closed PTFE Bellows Seal Solenoid Valves
Series PS

Features:

• 1,000,000+ cycle bubble-tight design; over 2,000,000 cycles has been achieved in field use.
• No metal parts in wetted area.
• Rugged thermoplastic construction.
• Patented Fail-Dry vented design.
• Resistant to atmospheric corrosion.
• Uses line pressure to assist operation, which allows extremely high Cv performance, as well as outstanding pressure ratings.
• Molded corrosion-resistant coil assembly.
• 11 watt/Nema 4X CSA approved water and dust tight enclosure.
• All valves are individually inspected and 100% tested.
• Optional coil connector light indicates when valve is energized.

Mode of Operation:

Requires 5 psi greater pressure at inlet to function properly. With proper differential, Series PS is normally closed (energize to open). Inlet pressure can be as high as 140 psi; backpressure (outlet) can be as high as 70 psi -- as long as the outlet pressure is 5 psi lower through the entire operating range.

When the signal is sent to close the valve, it takes about a second for the pilot pressure to overcome the process pressure. Once the pressure is overcome, closure is instantaneous, and potential for water hammer must be considered prior to specification.

Service:

Designed for pressure service; suitable for drain applications as long as 5 psi differential is maintained. Not designed for vacuum service. Not suitable for liquids containing particulate unless a .007 filter is used. Not suitable for liquids which tend to precipitate solids.

Application:

Series PS automatically shuts off flow of highly corrosive and ultra-pure liquids. They can handle acids, caustics, solvents, chlorine solutions, sodium solutions, deionized water, reverse osmosis water, brewery processes, etc. as long as a 5 psi differential is maintained. Series PS is not suitable for solutions containing particulate matter or solutions that tend to precipitate solids. Care should be taken when processing liquids prone to crystallization, such as salt solutions, etc. The internal workings of the PS valve can be adversely affected by crystallization. If you have any questions, please contact our technical group at (973) 256-3000.

Design:

Valves are normally closed by inlet pressure on a diaphragm over the main orifice. When the valve is energized and the pilot orifice is opened, the pressure above the primary diaphragm is released downstream. Once this pressure is released, the pressure below the main diaphragm forces it to open. When the valve is de-energized, pressure is returned to the top of the diaphragm, forcing it to close. The action of the pilot and diaphragm result in a slight delay in the opening and closing, generally a second or two. (Note that without the 5 psi required differential, the pressure above the primary diaphragm will not be released, and the valve will not function properly).

Available in 1/2", 3/4", 1", 1-1/2", 2" & 3" NPT sizes. Not all materials available in 2" or 3" sizes: 2" PS available in PVC, PP & PVDF. 3" PS available in PVC only. If your size and material needs differ, please contact factory.

After 1,000,000 cycles, we recommend that the valve be disassembled and inspected. It is also recommended to replace the elastomer seals at this point. Contact your distributor for a seal kit. For heavy use applications, you may wish to order a spare seal kit with the valve. Seal replacement takes but a few minutes with common tools; no special training is required.

Dimensions:

Specifications:

Coil Specifications

Pressure & Liquid Specifications

Flow Capacity vs. Pipe Size

Ordering Information:

Cost Comparison

When comparing valves, it is important to consider both the operating life, and how easily/costly it is to service the valve. Below is a lifetime cost comparison chart, pitting the Plast-O-Matic True Blue® Series PS against a well known competitive brand...

• The valves compared are 1" NPT pilot-operated solenoid valves, with PVC bodies and FKM seals. (FKM is often compared to the brand name Viton, which is a registered trademark of DuPont Dow Elastomers) Prices are per catalog, January 2001, and are subject to change.
• The Plast-O-Matic valve has a 9.5 Cv rating with a rated pressure range of 5 - 140 psi.
• The competition's valve has a 10.3 Cv rating with a rated pressure range of 7 - 85 psi.
• Plast-O-Matic recommends inspection at 1,000,000 cycles. Assuming a rebuild kit is required -- and it may not be -- the valve can be returned to like-new condition in a few minutes, without any special training. Cost of the rebuild kit is $155.
• The competitor states: "The valve will last 200,000 to 500,000 cycles, at which point we recommend buying a new valve, because the rebuild kit is virtually the entire valve and costs approximately the same."
• Even when competitive valves are priced hundreds of dollars lower, Plast-O-Matic users still come out way ahead in terms of cost per cycle. For example, if the initial cost of the other valve were $174, the total life cycle cost in this comparison would still be $166 more than Plast-O-Matic...not to mention the staggering cost of multiple downtimes.

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Helpful Links:

PDF Catalog File for the product shown on this page (Series PS)

Determining Amperage for a Plast-O-Matic Solenoid Valve This is a technical document in Microsoft Word format that explains how to calculate the amperage required for Plast-O-Matic AC or DC coils.

Overview of the Entire Solenoid Valve Line, which may be the page you were on prior to this one. Provides key items for quick comparison and selection.

Series EASMT & EASYMT, Top of the line, direct-acting solenoid valves with PTFE bellows. The EASMT & EASYMT are suitable for pressure, drain, and vacuum, salt solutions, acids, caustics, solvents, even liquids prone to crystallization. 1/2", 3/4" & 1".

Series EASMD & EASYMD, Valves use a rolling diaphragm in lieu of the PTFE bellows dynamic seal. These diaphragm valves are well suited to salt solutions, caustics, and other crystallizing liquids, but they are not designed for vacuum applications. Same range of sizes.

Series EASM & EASYM, Valves use a triple u-cup seal in lieu of PTFE bellows. The EASM & EASYM are suitable for pressure, drain, and vacuum, but are NOT recommended for salt solutions or any liquid prone to crystallization. Same range of sizes.

Series EAST, Compact valve with outstanding performance. Uses PTFE bellows dynamic seal, 1/4" & 1/2" sizes. Choice of orifice sizes for various combinations of pressure & flow capacity. Suitable for all types of solutions.

Series EASY-NO, Normally-open, direct acting valve in 1/4" & 1/2" sizes.

Series THP, Compact 3-way (aka diverter) solenoid valve.

Series WCM, Compact, direct-acting 2-way valve with stainless steel & silver wetted core. (this is the only Plast-O-Matic solenoid valve with a wetted metal core). Offers an outstanding combination of price and performance.

Pressure Drop Calculator How will a particular solenoid valve affect the pressure in your piping system? If you

Additional Info: Request Catalog PS

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