All welded diaphragm seal


Hyett Diaphragm Seals offer superior construction features for total dependability, including top quality steel and other materials, precision machining of threaded connections.

SKU: 15AW/25AW Categories: , Tags: ,


  • All welded diaphragm seal - 15AW

    All welede mini-seals, 1500-2000 psig

  • All welded diaphragm seal - 25AW

    All welede mini-seals, 1000 psig max

  • All welded diaphragm seal - 25AWF

    All welede mini-seals, 1000 psig with 1/4" cleaning port


Hyett Diaphragm seals are utilized to protect pressure indicators from harmful process fluids. Diaphragm seals isolate pressure
gauges and prevent the medium from entering the internals of the pressure gauge. Diaphragm seals are used to prevent
corrosive process fluids from entering pressure gauge internals, clogging gauge internals, or solidifying within the pressure

Hyett’s line of diaphragm seals, in conjunction with most pressure indicators, offers instrumentation that is rugged and carefully
calibrated to withstand the most severe industrial process or OEM service. Hyett diaphragm seals are available in a variety of
metal housing materials and process connection sizes to fit most requirements


  • Sizes: 1/4" – 1” NPT or 150#, 300# or 600# flanged available
  • Fill Fluids: Silicone, High temperature silicone, Glycerin.
  • Lower Housing Materials: Optional Steel, 304SS, 316SS, Hastelloy B or C, Monel, Nickel, PVC, Teflon, Brass, Titanium & Polypropylene
  • Diaphragm Materials – 316 Stainless Standard
    Special Materials include 304SS, Monel, Tantalum, Hastelloy B & C, Carpenter 20, Nickel, Titanium & Teflon
  • Optional Features: 316SS top housing with SS rings, nuts and bolts. Pipe plugs for flushing connections. Flange faces – raised face, flat face or ring joint
  • Capillary Lines: If your application requires a stainless steel capillary line, specify one of the following and your desired length when ordering.
    Stainless Steel plain tube 1/4" NPT
    Stainless Steel plain tube 1/2" NPT
    Stainless Steel armored 1/4" NPT
    Stainless Steel armored 1/2" NPT
  • Pressure Ratings
    25AW - 1000 psi.
    15AW - 1500 psi.

order codes - common models

15AW-4I4I1/4"npt x 1/4"npt femaleall 316L SS

minimum 100 psig x maximum 2000 psig, for 3 1/2" dial gauge max.

15AW-4I2I1/4"npt x 1/2"npt female

1/4"npt x 1/4"npt female

all 316L SS

minimum -25"Hg/vac x maximum 1000 psig, for 4 1/2" dial gauge max.


25AW-4I2I1/4"npt x 1/2"npt female
25AW-2I2I1/2"npt x 1/2"npt female

1/4"npt x 1/4"npt female

all 316L SS

minimum -25"Hg/vac x maximum 1000 psig, for 4 1/2" dial gauge max.

cleaning port 1/4"npt


1/4"npt x 1/2"npt female

25AWF-2I2I1/2"npt x 1/2"npt female

Additional information


15AW, 25AW, 25AWF

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