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Ashcroft 100 Threaded Diaphragm Seal

Threaded Diaphragm Seal

The comprehensive line of Ashcroft® diaphragm seals will meet a wide variety of application or installation requirements. Over 30,000 variations are possible with the types, connections and materials available.

• The top housing and diaphragm capsule are interchangeable with all Ashcroft bottom housings.
• A fill/bleed connection is standard, which permits filling the seal and instrument simultaneously after evacuation and allows the fill to flow into the completed unit.
• A Viton O-ring, compatible with all standard fill fluids, and a Teflon backup ring provide a seal between the diaphragm capsule and the top housing.
• A thin Teflon PTFE gasket between the diaphragm and bottom housing assures a leak-tight corrosion resistant seal even at high pressure.
• Top housing and pressure instrument are removable.
• Continuous-duty design will prevent loss of process fluid if pressure instrument is removed or fails.

Select a link under the "item" tab below to order.

Table 1Table 2Table 3Table 4Table 5Table 6
Table 1Type Number
101Threaded with flushing connection
102Raised Face Flanged ½",¾” NPT
103Raised Face Flanged 1½”,2”,3”(raised face only)
104In-line Threaded
106In-line Flanged
107In-line Socket Weld
108In-line Butt Weld
Table 2Process Connection
Table 3Diaphragm Material
S316L stainless steel
C304 stainless steel
PMonel 400
DCarpenter 20
GHastelloy B
JHastelloy C 22
HHastelloy C 276
PHHalar Coated Monel
WGold Plated 304 st. stl.
Table 4Bottom Housing Materials
C304L stainless steel
S316L stainless steel
GHastelloy B
JHastelloy C 22
HHastelloy C 276
DCarpenter 20
MMonel “400”
WInconel “600”
SUTantalum clad stainless steeI
BHHalar coated stainless steel(²)
TTeflon flanged steel(³)
Table 5Instrument Connection
02T¼ NPT
04T½ NPT
Table 6Filling Fluid
CodeFilling Connection to Instrument
CGGlycerin Direct Only
CKSilicone Direct or Flexible Line
CFHalocarbon Direct or Flexible Line
HASyltherm Direct or Flexible Line
Process connection size ¼ NPT, ½ NPT, ¾ NPT, 1 NPT, G ¼, G ½, G ¾, G 1
All connection sizes male or female. Others on request
Construction Bolted top and bottom housing, removable for easy maintenance
Fill port At the side with stainless steel ball and set screw
Flushing connection No
Flushing connection size ¼ NPT female for process connection sizes ¼", ½" and ¾"
1/8 NPT female for process connection size 1"
Maximum pressure Standard in psi/bar 500/35 Viton & Kalrez diaphragm
Metal capsule/diaphragm in psi/bar 2500/172
With high pressure ring in psi/bar 5000/350
Instrument connections [female] ANSI/ASME B1.20.1 ¼ NPT, ½ NPT, others on request
ISO 228-1 G ¼, G ½
Material (wetted parts) Bottom housing Steel, stainless steel 316L (1.4404), stainless steel 304L
(1.4306), Monel 400, Hastelloy C, Hastelloy B, Inconel 800,
Nickel, Carpenter 20, Titanium, PVC, Kynar
Diaphragm/capsule (metal type) Stainless steel 316L (1.4404), stainless steel 304L (1.4306), K-Monel, Hastelloy C,
Hastelloy B, Nickel, Carpenter 20, Tantalum
Diaphragm (other types) Halar coated Monel, Gold plated stainless steel 304L (1.4306)
Material (non wetted parts) Top housing Nickel plated carbon steel, optional stainless steel 316L (1.4404), 316L is standard for ISO connections
Clamps, rings, bolts and nuts Steel, painted black,
optional stainless steel 300 (bolts and nuts max. 1500 psi/100 bar)
Accuracy Additional 0,5 % to the specified tolerance of the mounted instrument
Conformity according to RL 94/9/EC
appendix X for mechanical equipment
in potential hazardous areas
Optional, marking
File no. 800319037X at notified body 0032, TÜV NORD CERT
The temperature class will be determined by the used measuring device.
Limits for diaphragm/capsule material Teflon
Temperature -40/400 °F, -40/204 °C
Maximum displacement volume in cm3 2,23
Filling liquids (temperature range) Glycerin (0/400 °F, -18/204 °C), silicone (-40/600 °F, -40/315 °C), halocarbon (-70/300 °F, -56/149 °C),
Syltherm 800 (-40/750 °F, -40/400 °C), vegetable oil (32/248 °F, 0/120 °C) , Neobee M-20 (0/320 °F,
-17/160 °C). Others on request, also depending on selected material and configuration.
Mounting Direct or with capillary
Weight dry in kg 0,8, with high pressure rings 1,1
Accessories, options NACE, pressure gauges, pressure switches, capillaries

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