text.skipToContent text.skipToNavigation
Swagelok DE Series Springless Diaphragm Valves for Modular Gas Systems

Swagelok® Springless Diaphragm Valves for Modular Gas Systems (DE Series)

DE series springless diaphragm valves for 1.125 in. C-seal or W-seal modular gas systems are easy to install, provide a visual indication of flow direction, and have a seat design that improves thermal stability.

Request More Information

DE series springless diaphragm valves are easy to install due to the fixed orientation of the actuator to the body in both pneumatic and manual lockout actuation options.

The valve design includes a fully contained PFA seat for minimal particle generation, a weld isolation ring for enhanced diaphragm cycle life, and a fully swept flowpath in the body which minimizes entrapment areas and facilitates purging.


Working Pressure Vacuum to 125 psig (8.6 bar)
Burst Pressure >3200 psig (220 bar)
Actuation Pressure
Normally Closed 60 to 120 psig (4.1 to 8.2 bar)
Normally Open and Normally Closed with Manual Integral Lockout Override 60 to 90 psig (4.1 to 6.2 bar)
Temperature 14° to 150°F (–10° to 65°C)
Flow Coefficient 0.3
Body Materials 316L VIM-VAR stainless steel
Diaphragm Material Cobalt-based superalloy
End Connections
Type 1.125 in. modular surface mount (MSM)
Configurations 2-port and 3-port

DE Series Springless 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.

Reducing fugitive emissions in the chemical and refining industries
Minimize the Costs of Fugitive Emissions with Low-E Valves

Fugitive emissions are a growing concern in the chemical and petroleum refining industry. Certified low-emissions (Low-E) valves can protect your facility and bottom line. Learn what they are, how they are tested, and how they can help you in this post.

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.

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