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Angle & Inline Valves

Introduction

Vacuum angle and inline valves are devices that regulate the flow of gases, fluids or materials through a structure or aperture by opening, closing or obstructing a port or passageway. 

Angle valve assemblies consist of an 

  • Actuator
  • Poppet
  • Valve Body
The actuator provides the power to position or transport the valve’s poppet which is attached to the valve’s body via a circular bonnet flange. 

The poppet closes or opens one of the valve’s body ports. 

The valve body is a vacuum tight chamber that is screwed, flanged or welded into a larger vacuum vessel or system.

Reliable vacuum valves were not commercially available until the late 1940s with the advent of O-ring elastomer seals. The elastomer O-ring was developed during WWII for use in aircraft hydraulic systems, and was soon thereafter adopted by the vacuum community as the standard means of making vacuum seals. Prior to this it was common practice, even in large research establishments, to upgrade general service valves for vacuum use by winding actuator shaft gaskets from string soaked in an Apiezon grease.

Angle and Inline Valves Group

MDC stainless steel vacuum angle and inline valves have been designed for maximum conductance and minimum size for easy installation. These valves are ideally suited for systems requiring high reliability and low outgassing. The valves’ low outgassing characteristics can be attributed to a fusion welded 304 stainless steel body, welded AM-350 stainless steel nesting bellows as well as small crosssection elastomers and the elimination of blind internal cavities.

MDC angle and inline valves are offered in various sizes ranging from .25" to 10" port diameters. Standard port mounts include: 

  • Del-Seal™ CF metal seal flanges, recommended for ultrahigh vacuum service
  • ISO Kwik-Flange™ and ISO Large-Flange™ fast-make and fast-break elastomer seal flanges, ideal for high vacuum applications requiring frequent assembly and disassembly.

All dimensions in this catalog are given in
inches unless specified otherwise.

 Standard Features
  • UHV and HV series
  • Del-Seal™ CF, ISO KF Kwik-Flange™, ISO LF Large-Flange™ and Tube-Weld port connections.
  • Manual and Electropneumatic actuators
  • 120VAC air control solenoid valve
  • OFE copper metal and Viton® elastomer bonnet seals
  • Welded bellows actuator seal
  • TIG welded internal body joints
  • Electropolished interior and exterior surfaces
 Optional Features
  • Electromechanical position indicator
  • Magnetic reed switch position indicators
  • Air control solenoid valves for 240VAC and 24VDC service
  • High temperature 250°C Kalrez® elastomer poppet seal
 
 Angle Valves
For product listing, features and specifications click on links below
 1/4  inch ports
 1/2 inch ports
 3/4 inch ports
 1 inch ports
 1-1/2 inch ports
 2 inch ports
 2-1/2 inch ports
 3 inch ports
 4 inch ports
 6 inch ports
 8 inch ports
 10 inch ports


 Inline Valves
For product listing, features and specifications click on links below
 3/4 inch ports
 1 inch ports
 1-1/2 inch ports
 2 inch ports
 2-1/2 inch ports
 3 inch ports

 Related Topics
 Angle and Inline Valves Options Guide
 Angle and Inline Valves Specifications
 Angle and Inline Valves General Guidelines
 Angle and Inline Valves Port Connection Guide
 All-Metal Angle and Inline Valves
 Variable Leak Valves- Fine Leak
 Variable Leak Valves- Precision Leak
 Butterfly Valves

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