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Angle and Inline Valves
Options Guide

 Mechanical Position Indicator  Option-01
MDC angle and inline valves are available with precision mechanical position indicator (MPI) option. The MPI system consists of two single pole, double-throw micro switches mounted on top of the pneumatic actuator air cylinder. Each micro switch is wired in the normally open position. Wiring in a normally closed position is available on request, and easily modified by reversing standard factory wiring. 

Precise actuation of each micro switch is factory adjusted by positioning individual switch triggers mounted on the actuator shaft. Field installation of this option is not available. Contact factory for further information.


 Magnetic Reed - Switch Position Indicators  Option -02
MDC magnetic reed switches consist of four basic components: a glass capsule, a gas filler (the atmosphere inside the glass capsule), electrical contacts and two ferromagnetic reeds. 

The reeds are hermetically sealed into the glass capsule in a cantilever fashion so that the ends align and overlap, while maintaining a small gap between them. The floating end of each reed will assume opposite magnetic polarity when brought into the proximity of a magnetic field. When the magnetic flux density is sufficient, the attraction force of the opposing magnetic poles will overcome the reed stiffness causing them to flex towards each other and make electrical contact. Since these switches have no mechanical parts to wear out this operation can be repeated millions of times.

The characteristic life expectancy of these switches is rated at 100 million cycles, provided electrical ratings are not exceeded. 

Contacts normally open, 110-120VAC, 0.5 amperes and 10 watts maximum. MDC reed switch position indicators will operate at temperatures ranging from (-) 40°C to (+) 125°C.


 Air Control Solenoid Valve   Option -03  and -09
Angle and inline valves fitted with standard electropneumatic actuators are equipped with Humphrey 310 or 410 series 120VAC 50/60Hz air control solenoid valves. Airopen / spring-close angle and inline valves use the 310 series solenoids, while the 410 series solenoid is used with the air-open / air-close angle and inline valves. AC/DC power consumption for this solenoid valve is 4.0 watts. 

24VDC and 240VAC solenoid valves are optional and available by adding the option numbers to the end of the specific angle or inline valve part number. All solenoid valves are fitted with DIN type connectors that conform to international standards. DIN connectors provide simplicity, convenience and fast, easy electrical installation. Solenoid valves come standard with push button / spring return manual override. The manual override is located at the top of the solenoid and identified by a prominent red push button.

Air control solenoid valves are designed for use with compressed air from 0 to 125psig. Media should be clean and uncontaminated. When in doubt, install a filter with a 40 micron filtering capacity. Periodically remove and clean or replace filter element.


 High Temperature Poppet Seal  Option -11
Angle and inline valves are supplied standard with Viton® elastomer poppet seals. UHV series valves, which have metal sealed bonnet flanges, can be ordered with the high temperature Kalrez® compound 4079 poppet seal gasket option. Kalrez® compound 4079 elastomers are suitable for vacuum bakeout to 250°C (with poppet in an open position). Kalrez® compound 4079 offers excellent chemical resistance and good mechanical properties. When compared to Viton® elastomers, Kalrez® has lower outgassing characteristics for any given temperature from ambient to 250°C. 

As with standard poppet seals, Kalrez® elastomer seals have a small amount of Krytox® LVP vacuum grease applied at the time of installation. Vacuum grease should be applied to elastomer gaskets in order to maximize its sealing properties and extend its cycle life. 

Installation of a poppet seal is accomplished by pressing an O-ring into the poppet groove first at the 12 and 6 o’clock positions then at the 3 and 9 o’clock positions, etc. Pressing the O-ring into the groove in this manner avoids twisting the O-ring. 

Note that Kalrez® has a much faster permeation rate for helium than does Viton®.

Note: When ordering Angle or Inline Valve Options, please add the option number(s) to the end of the desired UHV or HV Series Angle Valve or Inline Valve Part Number.
Example: A 2½-inch electropneumatic HV Angle Valve has Part Number 313037. To include a Mechanical Position Indicator Option -01 and a 24VDC Air Control Solenoid Valve Option -03, the Part Number is 313037-01-03.

 Related Topics
 Angle and Inline Valves Port Connection Guide
 Angle and Inline Valves Specifications
 Angle and Inline Valves General Guidelines
 Angle and Inline Valves Introduction