Diaphragm Seals Non-Replaceable

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Type 20 Front Flush, Non-Replaceable Diaphragm Seals

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Application Brochures
Water/
Wastewater
  • Designed for applications requiring an NPT male threaded process connection and with a flush diaphragm
  • Flush diaphragm construction prevents clogging and process material build-up
  • Constructed with a 316 Stainless Steel housing and diaphragm for strength and durability
  • Available instrument connection sizes are 1/4” and 1/2" with a process connection size of 1/2" NPT male to 2" NPT male
  • Consider instrument size, pressure range, media composition, ambient and operating temperature, and maximum working pressure when selecting
  • Capillaries and cooling elements are available for elevated process temperatures, see options & accessories below
  • Fill fluid must be compatible with process media; i.e. Glycerin may become volatile in conjunction with a strong oxidizing agent such as chlorine, forms of oxygen or peroxide and nitric acids

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TYPE 20          
INSTRUMENT CONNECTION SIZES 02 1/4" NPT 04 1/2" NPT    
HOUSING MATERIAL S 316 Stainless steel        
DIAPHRAGM MATERIAL S 316 Stainless steel        
PROCESS CONNECTION SIZES 04 1/2" NPT 08 1" NPT 16 2" NPT
06 3/4" NPT 12 1-1/2" NPT    

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PRODUCT SPECIFICATIONS
Seal type Front flush, welded diaphragm
Instruments Type Size Minimum Pressure Maximum Pressure
Seal Connection
Size 1/2" NPT
Gauges 2-1/2" 0 psig to 1,500 psig 0 psig to 9,000 psig
Transducers 0 psig to 30 psig 0 psig to 9,000 psig
Switches 0 psig to 30 psig 0 psig to 9,000 psig
Seal Connection
Size 3/4" NPT
Gauges 2-1/2" 0 psig to 160 psig 0 psig to 9,000 psig
Gauges 4" to 4-1/2" 0 psig to 1,500 psig 0 psig to 9,000 psig
Transducers 0 psig to 30 psig 0 psig to 9,000 psig
Switches 0 psig to 30 psig 0 psig to 9,000 psig
Seal Connection
Size 1" NPT
Gauges 2-1/2" 0 psig to 160 psig 0 psig to 9,000 psig
Gauges 4" to 4-1/2" 0 psig to 1,000 psig 0 psig to 9,000 psig
Transducers 0 psig to 30 psig 0 psig to 9,000 psig
Switches 0 psig to 30 psig 0 psig to 9,000 psig
Upper Housing Type Continuous duty  
Connections 1/4" NPT, 1/2" NPT  
Material 316 Stainless Steel  
Operating temperature   Operating temperature is determined by the temperature/pressure
configuration. See Material Temperature table.

Options & Accessories

  • 1/4" NPT X 1/4" NPT Cooling Element (1/4" NPT X 1/4" NPT-CE)
  • 1/2" NPT X 1/2" NPT Cooling Element (1/2" NPT X 1/2" NPT-CE)
  • Works in combination with diaphragm seal to isolate instrument from high media temperatures
  • Recommended for process temperatures above 212 °F
  • Requires direct mounted system
  • Effective temperature reductions of 200 °F depending upon ambient conditions
  • High >212 °F process temperature, low < -40 °F process temperature
  • All Stainless Steel construction

WARNING: This product can expose you to chemicals including Chromium (VI) and Nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

  • Glycerin (GY) *
  • Silicone (SL)
  • Halocarbon® (HL)
  • Neobee M20 (NB)
  • Mineral Oil (MO)
  • Propylene Glycol (PG)

* Not recommended for use in vacuum applications.

NOSHOK's Distribution Manifolds connect multiple instruments to one diaphragm seal, eliminating multiple connections that lead to possible leak paths.

View NOSHOK Distribution Manifolds

  • 5 ft. SS Armored Flexible Capillary, 1/4" NPT (AC-02-02-5) per ft. adder (AC-02-02-#)
  • 5 ft. SS Armored Flexible Capillary, 1/2" NPT (AC-04-04-5) per ft. adder (AC-04-04-#)
  • Stainless Steel capillaries available with or without Stainless Steel armor
  • Protects the instrument from high or low process temperatures
  • Allows remote mounting of pressure instrument(s)
  • Select the shortest capillary length possible, as changes in ambient temperature conditions may significantly affect the accuracy and response time of the instrument
  • Standard length 5', others available
  • Installation on analog gauges requires a gauge support and gauge adaptor, or other surface mounting provisions
  • Any level difference between the instrument and the seal will result in a pressure indication error; make sure to compensate for the level difference during calibration of the diaphragm seal assembly if the level difference is known
  • Filling options for capillaries
    • Silicone - specify to 10 or 20 feet (SL-C)
    • Halocarbon® - specify to 10 or 20 feet (HL-C)

WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov


WARNING: This product can expose you to chemicals including Chromium (VI) and Nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov


WARNING: This product can expose you to chemicals including Chromium (VI) and Nickel, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov