Bulk Gas Diaphragm Valves—LD Series
With flow coefficients up to 13 and a variety of body materials and configurations, Swagelok® LD series bulk gas diaphragm valves can support a wide range of ultrahigh-purity shutoff, bulk-gas distribution, and isolation applications.
SpecificationsWorking Pressure Temperature
Flow Coefficient
Body Material
Diaphragm Material
End Connections
• Type
• Size |
Up to 300 psig (20.6 bar)
–20 to 300° F (–28 to 148°C)
Up to 13
CF3M cast stainless steel, forged and bar stock 316L stainless steel
316L stainless steel
Swagelok tube fitting, male VCR® face seal fitting, female NPT, female ISO, tube extension
1/4 to 1 in.; 12 to 25 mm
|
Features
- No springs or threads in wetted areas enable cleaner
operation.
- Contoured flow passages allow high flow.
- Tied diaphragm design provides positive stem retraction.
- Welded diaphragm construction
- Diaphragms are welded to stem to prevent leakage.
- Three diaphragms offer optimum combination of strength,
flexibility, and cycle life.
- Design provides all-metal fluid containment.
- Unique clamp ring design improves cycle life.
- Unique stem tip design
- PCTFE stem tip insert promotes leak-tight shutoff.
- Compensating stem tip helps prevent damage from
overtightening.
Cast-Body Bulk Gas Valves (1/2 and 1 in. Sizes)
- Machined wetted surfaces in body are finished to an average of
20 µin. (0.51 µm) Ra.
- Optional electropolished body exteriors (ELD series) are
available.
- Optional tube extension interiors electropolished to an
average of 10 µin. (0.25 µm) Ra.
- Purge ports are available.
Forged-Body
Bulk Gas Valves (1/2 in. Size)
- Design results in compact size, lower internal volume.
- Wetted surfaces are electropolished to an average of 5 µin.
(0.13 µm) Ra.
- Purge ports are available.
Bar Stock-Body Bulk Gas Distribution and Isolation Valves (1/2
and 1 in. Sizes)
 |
|
|
Isolation Valve
|
Distribution Valve
|
- Valve and tubular shapes are combined into one integrated,
compact component.
- Block bodies permit compact layout of bulk gas systems.
- Wetted surfaces are electropolished to an average of 5 µin.
(0.13 µm) Ra.
- Purge ports are 1/4 in. rotatable male VCR fittings.
Testing
SC-11 Process
Every LD series diaphragm valve processed in accordance with
Special Cleaning and Packaging (SC-11) is helium leak tested to a
maximum leak rate of 4 × 10–9 std cm3/s.
SC-01 Process
Every LD series diaphragm valve processed in accordance with
Swagelok Ultrahigh-Purity Process Specification (SC-01) is helium leak
tested to a maximum leak rate of 1 × 10–9 std cm3/s.
Cleaning and Packaging
Cast-Body Bulk Gas Valves
All LD series cast-body diaphragm valves are cleaned and packaged
in accordance with Swagelok Special Cleaning and Packaging (SC-11) to
ensure compliance with product cleanliness requirements stated in ASTM
G93 Level C. Cleaning and packaging in accordance with SC-01 is
available as an option for ELD series cast-body valves.
Forged-Body and Bar Stock Bulk Gas Valves
All LD series forged-body and bar stock diaphragm valves are
manufactured, cleaned, and packaged in accordance with Swagelok
Ultrahigh-Purity Process Specification (SC-01). Cleaning in accordance
with SC-11 is available as an option.
Options
Green handles are standard. A variety of other colors are
available.
Replacement diaphragm/stem subassembly and gasket kits are
available.