Call Us: (973) 256-3000 Plast-O-Matic Valves, Inc.
1384 Pompton Avenue
Cedar Grove, NJ 07009 USA

Direct Acting, Normally-Closed PTFE Bellows Seal Solenoid Valves

True Blue® Solenoid Valves Series EASMT & EASYMT for pressure, drain, and vacuum service; designed for all types of aggressive chemicals, salt solutions, acids, caustics, and ultrapure liquids such as deionized water.
NOW INCLUDES W24 Fully Rectified Coil with Z-Cool DIN Uses 75% Less Energy
Rectified R24 Coil Optional

Series EASMT & EASYMT are proven designs for aggressive chemicals


  • Sizes: 1/4", 1/2", 3/4" & 1"
  • Body Materials: Geon PVC, Corzan CPVC, Natural Polypro, Kynar PVDF
  • Seal Materials: FKM, EPDM
  • 1,000,000+ cycles tested under laboratory conditions; some applications report over 2,000,000 cycles in field use. Your results may vary.
  • No metal parts in wetted area -- Optional Xylan coated springs and fasteners available; consult factory.
  • Rugged molded construction.
  • Patented Fail-Dry® vented design.
  • Resistant to atmospheric corrosion.
  • PTFE bellows design eliminates the problems often encountered with highly aggressive chemicals, also eliminates the need to have multiple types of valves on hand.
  • Molded corrosion-resistant coil assembly.
  • W24 Coil with "COOL" DIN Connector is now standard; uses 75% less energy than previous design. R24 Coil is optional and ideal for applications that are energized less frequently. Both coils are rated for continuous duty.
  • IP-65 rated enclosure; CE Marked.
  • All valves are individually inspected and 100% tested.
  • Standard coil connector light indicates when valve is energized.
  • Supersedes Series EASM, EASYM, EASMD & EASYMD.

Photo at right is standard valve with energy saving W24 Z-Cool DIN coil, lighted connector and 18" leads, designed for applications requiring long continuous service. Below right is valve with optional R24 coil with 1/2" rectified DIN connector, suitable for applications that are energized intermittently.

Mode of Operation:

Normally closed (energize to open). No pressure differential required.


Pressure, drain, and vacuum. (must specify with order). Please note that the 1" EASMT is only rated to 15" of mercury (partial vacuum). All others rated to full vacuum.

Handling of Dry Chlorine & Use of Thermoplastic Valves: When ordering a valve for chlorine service, please specify "Chlorine-Vacuum" on the order.

Plast-O-Matic Valves are not recommended for use with pressurized dry chlorine gas.

Valve must be installed in upright, vertical orientation for maximum cycle life. Valves installed horizontally will usually function properly (this should be determined by testing in your application), but at the expense of valve longevity. Valves with 58 watt coils (discontinued) MUST be mounted in an upright, vertical orientation.


Series EASMT and EASYMT automatically shut 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. and do not require pressure to aid in opening the valve.


close up of the PTFE bellows used in Series EASMT & EASYMT

Valves are spring return normally closed and direct acting with a heavy duty push-pull plunger design. There is no minimum pressure required for operation. The PTFE bellows shaft seal eliminates the need for an elastomer seal which can weaken as a result of chemical attack. Provides low friction sealing, non-sticking operation, and million cycle design. The bellows design also allows a stock valve to be used for vacuum or pressure. A poppet seat ensures bubble-tight shutoff.

Available in 1/2", 3/4", and 1" sizes (EASMT) or 1/4" and 1/2" (EASYMT). The EASMT has a larger orifice, which permits higher flow with a slight reduction in pressure rating. The EASYMT has a slightly smaller orifice (.375") and offers higher pressures at the expense of flow. Even so, the 1/4" EASYMT has a Cv rating of 1.2, which is still outstanding.

After 1,000,000 cycles, we recommend that the valve be disassembled and inspected. It is also recommended to replace the elastomer seals and bellows 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.

Standard coil for PTFE bellows solenoid valves is the new IP65 W24 (24 watt) coil. This molded unit is equipped with a rectified, lighted, Z-COOL DIN connector with wire leads. The coil is designed to draw energy for opening, then remain open with reduced energy. On average this will reduce energy costs by 75%. It is continuous duty and remains at ambient temperature when continuously energized. W24 is a superior coil for applications that are constantly energized.

Optional coil for PTFE bellows solenoid valves is the new R24 (24 watt) coil. This molded unit is equipped with a rectified 1/2" DIN connection in place of wire leads. Coil assembly is IP65 rated. The R24 solenoid coil does not included the advantages of the Z-Cool Connector: It is continuous duty and operates with a surface temperature of approximately 220F when continuously energized for an hour or longer. R24 coil does not include the running light found on the standard W24 coil. R24 provides a lower initial cost, but higher operating cost due to increased energy use. It is best suited for applications requiring periodic energization.


dimensions of the True Blue EASMT & EASYMT solenoid valve.  These dimensions also apply to the diaphragm and u-cup seal designs, EASMD, EASYMD, EASM, and EASYM.


specifications and model numbers for the classic True Blue PTFE Bellows solenoid valve

  1. The pressure ratings shown in the table are maximum values. The valve will open at the maximum listed inlet pressure and it will close at the maximum listed back pressure. The valve may not operate properly, however, when the maximum inlet and back pressure values are used at the same time. Refer to chart, Pressure Ratings & Flow Rate Considerations, below.
  2. Model #s show Viton seals. For EPDM, change "V" to "EP".
  3. Standard coil is W24 Fully Rectified, with Lighted DIN connector & 18" leads. For R24 Coil (no Z-COOL, no light, no leads) change "W" in part number to "R".
  4. All model numbers must be completed with body material suffix; see below.
  5. Valves above rated for full vacuum EXCEPT for 1" sizes, which are rated to 15" Hg.
  6. 24 watt coils are continuous duty.
  7. .452 orifice on 1" size is a higher pressure, lower Cv option.
  8. Any questions? Please contact our Tech group at (973) 256-3000

Pressure Ratings & Flow Rate Considerations

The pressure ratings shown in the table above are maximum values. The valve will open at the maximum listed inlet pressure and it will close at the maximum listed back pressure. The valve may not operate properly, however, when the maximum inlet and back pressure values are experienced at the same time. The governing parameter is velocity in feet per second (ft/sec) through the valve. Velocity is determined by pipe size and flow rate. To determine if your application exceeds the velocity tolerances for this valve, refer to the chart below.

Flow Rate and Equivalent Velocity
Valve Pipe Size Flow Rate at
 5 feet per second velocity 
Flow Rate at
 10 feet per second velocity 
0.50" (½ in.); NPT/BSP3.4 GPM
17.4 LPM
6.8 GPM
34.8 LPM
0.75" (¾ in.); NPT/BSP 6.4 GPM
32.7 LPM
12.8 GPM
65.4 LPM
1.00" (1 in.); NPT/BSP 10.8 GPM
55.2 LPM
21.6 GPM
110.4 LPM

If your flow rate (in Gallons Per Minute or Liters Per Minute) is below the 5 ft/sec column for your pipe size, the velocity is within plastic piping industry standards and the valve will function properly.

If your flow rate indicates a velocity above the accepted standard of 5 ft/sec but less than 10 ft/sec, Plast-O-Matic does not guarantee proper operation. The valve may still function, but if it emits a chattering sound, discontinue use. At fluid velocities above 5 ft/sec you must consider water hammer in the system design.

If your flow rate is higher than that listed in the 10 ft/sec column for your pipe size, this valve must not be used in your application.

Ordering Information:

Note: For complete information please click here for .pdf catalog.

Helpful Links:

Tech Brief: Considerations of Piping Volume and Velocity when specifying Solenoid Valves

Tech Brief: Use of Chlorine with Thermoplastic Valves

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 EAST, Compact valve with outstanding performance. Uses PTFE bellows dynamic seal, 1/4" & 1/2" sizes.

Series PS, Pilot-operated valve with outstanding pressure and flow performance. Uses PTFE bellows dynamic seal. Complete sizes 1/2" through 3", requires 5 psi differential for proper operation.

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. Discontinued -- consult factory

Series EASMT/EASYMT with W20 Coil subsequently superseded by W24 above. Link to pdf file is provided for reference only.

Series EASMD & EASYMD, earlier rolling diaphragm design; subsequently superseded by the EASMT & EASYMT above. Link is provided for reference only.

Series EASM & EASYM, earlier u-cup seal design; subsequently superseded by the EASMT & EASYMT above. Link is provided for reference only.

Pressure Drop Calculator How will a particular solenoid valve affect the pressure in your piping system? If you know your approximate flow rate in gallons per minute, this calculator will tell you your pressure drop, or "Delta P."

Plast-O-Matic Valves, Inc. 1384 Pompton Avenue Cedar Grove,
NJ 07009 USA Phone: (973) 256-3000 Fax: (973) 256-4745
California Warehouse 4054 Brewster Way Riverside, CA 92501
USA phone: (951) 686-2852 Fax: (951) 686-6328
Email: Legacy home page: please click here