Phone: 1-859-255-5001 Fax: 1-859-255-6656

Direct Pilot Operated
Normally Closed
Air, Oil, Water or Vacuum

       
       

Specifications

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ANSI Symbol

Body Cast Bronze (ASTM B-61)
Pilot Cap Anodized Aluminum or Brass
Pilot Cylinder Tube
(1-1/2" and 2" models only)
Composite is Standard - Brass is Supplied with -B Suffix
Internal Parts Brass and Stainless Steel
Seals** Buna-N Standard (Optional Seals Available)
Temperature Range -30° F to +250° F with Standard Seals
Pressure Rating

Vacuum-500 PSI
Higher pressure ratings available, consult factory.

Pilot Ratio See model number chart below

 

NOTES:

**Main poppet seal on all models except 334724 and 334732 is Viton®, which provides better wear characteristics and longer life. The balance of the seals are Buna-N.

Use -H suffix for liquid pilot media (oil, water*, etc.)
* -B suffix must also be used with water or other corrosive pilot media.

Use -31 suffix for vacuum service


Model Numbers
Standard Pilot Ratio

NPT Pipe Size
(inches)
Cv Factor Pilot Ratio* Weight (pounds) Model Number
1/4 1.9 3:1 2.5 331404
3/8 3.8 3:1 2.5 331406
1/2 4.0 3:1 2.5 331408
3/4 5.32 2:1 2.9 331412
1 10.2 4:1 5.5 331416
1 1/4 18.4 3:1 7.7 331420
1 1/2 27.4 2:1 9.0 334724
2 48.0 1:1 13.5 334732
* Internal Line Pressure vs. Minimum Pilot Pressure

High Pilot Ratio

NPT Pipe Size
(inches)
Cv Factor Pilot Ratio* Weight (pounds) Model Number
1/4 1.9 8:1 3.4 324504
3/8 3.8 8:1 3.4 324506
1/2 4.0 8:1 3.4 324508
3/4 3.87 10:1 2.9 324512
1 8.06 10:1 5.5 324516
1 1/4 17.1 10:1 7.7 324520
1 1/2 23.6 10:1 9.0 334524
2 38.0 10:1 13.5 324532
* Internal Line Pressure vs. Minimum Pilot Pressure


How to Order Example:

This would be a standard pilot ratio, direct pilot operated, normally closed valve with 1" NPT ports, "-26" seal option for Viton®, "-B" pilot option for nickel-plated brass cap and brass pilot piston, and a "-H" pilot option for liquid pilot signal.

Note: When ordering, always state:
  1. Model
  2. Seal Option Code or Codes
  3. Pilot Option Code or Codes