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Product Listing

Gate Valves
Options Guide

 Gate Valve Optional Features include
  • Modular electromechanical position indicators
  • Air control solenoid valves for 240VAC and 24VDC service
  • High body roughing ports and
  • High temperature 250°C Kalrez® elastomer gate seal
 Mechanical Position Indicator  Option-01
MDC circular C-Loc® gate valves can be fitted with optional high precision, modular mechanical position indicators (MPI). This new MPI system consists of two single pole double throw micro switches fitted with integral hinged lever and roller actuators. Each micro switch is wired in a normally open position. Normally closed switches are available on request, and easily modified by reversing standard factory wiring. 

Precise positioning of each micro switch is possible by a patented vernier mechanism found only on MDC gate valves. MPI connections are made via industry standard seven pin circular threaded connectors supplied with mating female cable connectors. All pneumatic valves include solenoids pre-wired through MPI connector box.


 Air Control Solenoid Valve Option -03 and -09
MDC circular gate valves fitted with standard electropneumatic actuators are equipped with Humphrey 410 series 120VAC 50/60Hz air control solenoid valves. AC/DC power consumption is 4.0 watts. Optional 24VDC or 240VAC solenoid valves are available on request. 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. Manual override is located at top of solenoid and identified by a prominent red push button. Solenoid valves are designed for use with compressed air from 0 to 100psig. Air should be clean and uncontaminated. When in doubt, install a filter with filtering capacity of 40 microns. Periodically remove and clean or replace filter element. All solenoid electrical leads are pre-wired to MPI box connector.

Caution: Check voltage label on solenoid before connecting power. Do not separate coil portion (black) from body (aluminum).


 Roughing Port Option -04, -05 and -O6
With the exception of the .625 inch gate valve, all valves can be fitted with roughing ports. Valves with Del-Seal™ CF and ANSI ASA port flanges are supplied with Del-Seal™ CF roughing port flanges. All Del-Seal™ CF roughing ports are tapped. Valves with metric port flanges have Del-Seal™ CF roughing port flanges with metric tapped holes. Gate valves fitted with ISO Kwik and ISO Large port flanges are supplied with ISO Kwik roughing port flanges. 

Typical Installation

Roughing ports will be installed on the side opposite the gate seal (the carriage side of the valve). Although the location of the roughing port does not affect its function, the positioning of the gate is important. A roughing port provides a path to a vacuum chamber through the gate valve body. With the gate closed, the valve body and chamber may be evacuated by a vacuum roughing pump.

Standard gate valve roughing port include:

Option Valve Size Port Tube O.D. Port Flange
1.5 to 3.0
0.75 inch
1.33 CF or ISO NW16
4.0 to 8.0
1.5 inch
2.75 CF or ISO NW40
10 and 12
2.0 inch
3.37 CF or ISO NW50

 High Temperature Gate Seal Option -11
Gate valves are supplied standard with Viton® gate seals. UHV series valves, which have metal sealed bonnet flanges, can be ordered with the high temperature Kalrez® compound 4079 gate seal gasket option.
Kalrez® compound 4079 O-rings are suitable for vacuum bakeout to 250°C (with gate 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. Other special seal materials may be discussed with the MDC technical sales engineers.
When ordering Gate Valve Options, please add the option number(s) to the end of the desired UHV or HV Series Gate Valve Part Number.
Example: A 2½-inch manual UHV Gate Valve has Part Number 302002. To include a 3/4-inch Roughing Port Option -04 and a High Temperature Gate Seal Option -11, the Part Number is 302002-04-11.

 Related Topics
 Circular Gate Valve Specifications and Products
 Gate Valves Introduction 
 Rectangular Gate Valve Specifications and Products