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Daughtridge Sales Co., Inc.
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Toll Free: 800-967-7507 • Fax: 252-977-2192
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Ashcroft Diaphragm Seals |
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Type 100
Capsule Diaphragm
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 back-up 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
PRODUCT DATA SHEET
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Type 200
Welded or Bonded Diaphragm
Type 200 Welded
• Teflon gasketed, continuous-duty
diaphragm capsule is welded to the top
housing, which is then clamped to a
bottom
housing.
• Fill/bleed connection is standard.
• Top housing and pressure instrument
are removable.
• Available in same process connections,
materials, types and sizes as the Type 100
capsule design.
• Top housing is interchangeable
with all
standard Ashcroft® bottom housings.
Type 200 Bonded Viton, Kalrez
& Teflon
Similar in construction, materials, and product features to the Type 300 clamped diaphragm seal on page 142, the diaphragm in the Type 200 seal is bonded permanently to the top housing – and is the removable type.
PRODUCT DATA SHEET |
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Type 300
Clamped Diaphragm
• Broad selection of materials for meeting various service applications, including Teflon, Viton and Kalrez diaphragms.
• Elastomeric diaphragm is clamped securely between the top and bottom housings by clamp rings, assuring positive seal.
• Top housing is contoured to match diaphragm, minimizing distortion of the diaphragm should the pressure instrument be removed.
• Continuous duty.
• Fill/bleed connection is standard.
• Top housing and diaphragm are nonremovable.
• Teflon, Viton and Kalrez diaphragms available in threaded and flanged inlet connections.
PRODUCT DATA SHEET |
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Type 310/315
All Welded Mini Seal
• Compact size to fit space- restricted areas
• Designed to protect transducers,
miniswitches and 31⁄2˝ or smaller pressure gauges from corrosion, plugging or freeze-up
• All-welded metal construction prevents leakage of process media
• Rated for 2500 psi at 100°F
• Fill/bleed connection is standard
PRODUCT DATA SHEET
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Type 320
Quick Connect
The Ashcroft® Type 320 quick-connect
diaphragm seal is designed especially for
those applications that require ease of
dismantling and re-assembly and do not
require a 3A standard rating in accordance
with sanitary standard 74-00.
Typical applications include the
pharmaceutical, dairy, food processing,
biotechnology, and filtration markets. Also
included are breweries, distilleries, wineries
and citrus juice production plants.
Standard features include:
• 316L stainless steel diaphragm
welded to a 316L stainless steel top housing.
• Fill/bleed connection
• Top housing and pressure instrument removable from process.
• Compatible with Tri-Clover and
Cherry Burrell S line connections
PRODUCT DATA SHEET
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Type 330
All Welded Flush
Mini Diaphragm Seal
• All welded metal construction, prevents leakage of process media
• Flush design eliminates pockets that could cause clogging or build-up of
process media
• Diaphragm area easy to clean up
• Provided with a 1˝ MNPT process connection
• Compact size to fit space-restricted areas
• No gaskets or bolts
• For use on pressure gauges up to 31/2˝ from vacuum to 1000 psi
• Top housing and diaphragm material 316L stainless steel
• 1/4 & 1/2 NPT instrument connection
• Adds an additional 1% tolerance to the gauge
PRODUCT DATA SHEET
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Type 311/312
All Welded
Midi Diaphragm Seal
• All welded metal construction, prevents leakage of process media
• No gaskets or bolts
• For use on pressure gauges up to 31/2˝ from vacuum to 1000 psi and 41/2˝ gauges 100 psi to 1000 psi
• Top housing material 316L stainless steel standard
• Diaphragm materials in 316L stainless steel, hastelloy C and tantalum
• Bottom housing materials in 316L stainless steel and Hastelloy C
• 1/4 NPT or 1/2 NPT female, 1/4-1/2 NPT male process connections
• 1/4 NPT or 1/2 NPT instrument connections
• Type 312 furnished with 1/8 NPT flushing connection
• Type 312 not available in male process connections
PRODUCT DATA SHEET
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Type 400/500
All Welded
Diaphragm Seals
• Recommended for use where clamped joints are not acceptable
• Assists in controlling plant
emissions by helping prevent potential leakage of hazardous chemicals
• Prevents inadvertent disassembly
• All-stainless steel construction
is standard. Other materials available
PRODUCT DATA SHEET
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Type 740/741/702/703
Instrument Isolator
High Displacement
• For pressure instruments ranging from 30˝ H2O to 750 psi
• Used in instruments with large displacement actuators
• For applications requiring an impermeable metallic diaphragm
• Available in many material combinations
• Diaphragm electron beam welded to isolator body
• Furnished with fill/bleed connection
PRODUCT DATA SHEET
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Types 80/81/85/86
Iso-Ring, Iso Spool
With the Ashcroft® Isolation Ring, the instrument is in contact with the fill fluid, not directly
with the process flow. Clogging or fouling is never a problem. The Iso-Ring has a flexible
inner cylinder, behind which is the fill fluid. As process liquid flows through the pipe, it exerts
pressure. The pressure exerted by the fill fluid is then monitored by the instrument-sensing
element. A 360-degree flexible cylinder means no plugging, assuring reliable and accurate
pressure readings. A built-in threaded needle valve is provided as standard. This permits
the removal of a pressure instrument for calibration, repair, or replacement without shutting
down the process flow.
Adaptable to a variety of process conditions and applications, the Ashcroft Iso-Ring can be
used for protection of instrumentation such as pressure gauges, switches, transmitters,
recorders and transducers. The Iso-Ring fits between customer-supplied piping flanges like
many butterfly valves, and is available for piping diameters from 2˝ to 20˝. It can be used
at any pressure within the limitations of ASME classes 150 and 300, and even in most vacuum
applications.
Ashcroft® Type 85 and 86 Iso-Spools are used for small-diameter piping. Designed to provide
a large sensing area in the smaller pipe diameters from 1˝ to 2˝, the patented Iso-Spool is
offered in either NPT threaded or flanged models. Type 86 is available with flat or raised-face
flanges.
Product Data Sheet
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M&G Replacement Saddle
T-205 3", 4" & Larger
• Ashcroft® replacement assembles directly into M&G lower housings that are welded in existing piping systems
• All welded metal construction
• For use on pressure gauges up to 41/2˝ from vac. to 2500 psi
• Top housing material 316L stainless steel standard
• Diaphragm materials in 316L stainless steel, Hastelloy C and tatalum
• Continuous-duty design will prevent loss of process fluid if pressure instrument is removed or fails
• 1/4 or 1/2 NPT instrument connections
• Adds an additional 1/2% tolerance to the gauge
PRODUCT DATA SHEET
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Right click on the Product Data Links to download the product sheet to your computer. |
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Product Data Sheets require Adobe Acrobat Reader.
Click on the link below to get the lastest version.
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