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Home » Products » Diaphragm Seals » Non-Replaceable » Type 30L Reduced Pressure, Non-Metallic Lower, Bolted, Non-Replaceable Diaphragm Seals

Type 30L Reduced Pressure, Non-Metallic Lower, Bolted, Non-Replaceable Diaphragm Seals

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  • Designed for applications where typical metallic lower housings cannot withstand process media
  • Can be used for remote mounting of pressure instrument(s) with capillary, see options & accessories below
  • Utilizes an all metallic diaphragm welded to the upper housing to allow replacement of the non-metallic lower housing while maintaining continuity of the measuring system
  • Consider instrument size, pressure range, media composition, ambient and operating temperature, and maximum working pressure when selecting
  • 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 30L              
INSTRUMENT CONNECTION SIZES 02 1/4" NPT 04 1/2" NPT        
UPPER HOUSING MATERIALS C Carbon steel P Carpenter 20 U Titanium Grade 4    
M Monel 400 S 316 Stainless steel        
DIAPHRAGM MATERIALS A Tantalum M Monel 400 * P Carpenter 20 * U Titanium Grade 4 *
H Halstelloy C-276 N Inconel 600 S 316 Stainless steel    
SEAL GASKET MATERIALS R Klingersil C-4401 T PTFE V FKM    
PROCESS CONNECTION SIZES 02 1/4" NPT 06 3/4" NPT 10 1-1/4" NPT    
04 1/2" NPT 08 1" NPT 12 1-1/2" NPT    
  (ASME and DN flanges available upon request)    
LOWER HOUSING MATERIALS KN PVDF PV PVC TG PTFE (glass filled)    
PP PP TC PTFE (carbon filled)        

* When selecting a Monel 400, Carpenter 20 or Titanium Grade 4 diaphragm, the upper and lower housing must be the same material.

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PRODUCT SPECIFICATIONS
Seal type Threaded with welded diaphragm (Flanged available on request)
Instruments Type Size Minimum Pressure Maximum Pressure
Gauges 2-1/2" to 6" 0 psig to 30 psig 0 psig to 200 psig
Transducers 0 psig to 30 psig 0 psig to 200 psig
Switches 0 psig to 30 psig 0 psig to 200 psig
Upper housing Type Continuous duty
Connections 1/4" NPT, 1/2" NPT
Materials Polyurethane enamel coated steel, 316 Stainless Steel
Diaphragm Size 2.4"
Displacement 1.5 ml
Materials 316 Stainless Steel, FKM, PTFE (Exotic materials available on request)
Gaskets   NBR, PTFE and FKM
Lower housing Connections 1/4” NPT, 1/2” NPT, 3/4” NPT, 1” NPT, 1-1/4” NPT and 1-1/2” NPT
Materials PVDF, PP, PVC, PTFE (Other materials available on request)
Bolting   Zinc-plated steel, optional 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 Nickel, 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

  • 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 Nickel, 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

For NOSHOK Diaphragm Seals with Carbon Steel lower housing materials:

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


For NOSHOK Diaphragm Seals with Stainless Steel lower housing materials:

WARNING: This product can expose you to chemicals including Nickel, 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