text.skipToContent text.skipToNavigation
Swagelok LD Series Bulk-Gas Diaphragm Valves

Swagelok® Bulk-Gas Diaphragm Valves (LD Series)

LD series bulk gas diaphragm valves offer a combination of strength, flexibility, and cycle life to support a wide range of ultrahigh-purity shutoff, bulk-gas distribution, and isolation applications.

Request More Information

LD series diaphragm valves have a welded diaphragm construction using three diaphragms welded to the stem to prevent leakage. No use of springs or threads in wetted areas enable cleaner operation, and a unique stem tip design promotes leak-tight shutoff. Flow coefficients up to 13 and a variety of body materials and configurations are available to meet a range of design specifications.

Specifications

Working Pressure Up to 300 psig (20.6 bar)
Temperature –20° to 300°F (–28° to 148°C)
Flow Coefficient Up to 13
Body Materials CF3M cast stainless steel, forged and bar stock 316L stainless steel
Diaphragm Material 316L stainless steel
End Connections
Type Swagelok® tube fitting, male VCR® face seal fitting, female NPT, female ISO, tube extension
Size 1/4 to 1 in.; 12 to 25 mm

LD Series Bulk-Gas Diaphragm Valves Catalogs

Locate detailed product information, including materials of construction, pressure and temperature ratings, options, and accessories.

Swagelok flow coefficient (C<sub>v</sub>) calculator for valves

The Right Valve Can Make All the Difference

Use our valve flow coefficient (Cv) calculator to chose a valve sized correctly for your needs.

Use the Tool

Swagelok Resources Curated for You

Valve selection for fluid systems
How to Select the Right Valves for Your Industrial Fluid System

Learn how to apply the practical STAMPED method to select the valves most suited to your industrial fluid or sampling system design applications.

Block valves in an industrial fluid system
How to Isolate Industrial Fluid Systems with Block Valves

The isolation of industrial fluid system lines prior to maintenance is vital to plant safety. One of the safest ways to isolate a fluid system line is to install two block valves. Learn how to design proper configurations for your system.

Cleanroom assembly of a Swagelok ALD20 UHP valve for semiconductor industry use
One New Valve. Three Reasons It Could Change Semiconductor Manufacturing

Find out how the latest innovation in atomic layer deposition (ALD) valve technology is changing the game for high-tech semiconductor manufacturers.

Carl White, who has spent nearly 40 years working at various points in the semiconductor industry supply chain, offers a firsthand perspective on the past, present, and future of semiconductor industry advancement.
Q&A: Semiconductor Manufacturing Past, Present, and Future

Find out how collaboration between semiconductor tool OEMs, microchip manufacturers, and fluid system solutions providers has enabled the semiconductor market to keep up with the demands of Moore’s Law for decades, and where we go from here.

This process may take several minutes. Please be patient and remain on the page.