Phone: 1-859-255-5001 Fax: 1-859-255-6656

Port Sizes Available in Valve Body

1/8"NPT                                Pneumatic or hydraulic media ( not available in solenoid operated models)
1/4"NPT                                Pneumatic or hydraulic media
7/16"-20 SAE-4                   Hydraulic media only (pneumatic by special request and pricing)
3/8"NPT                                Pneumatic or hydraulic media
1/2"NPT                                Pneumatic or hydraulic media
9/16"-18 SAE-6                   Hydraulic media only (pneumatic by special request and pricing)
Note: Pilot ports are 1/4" NPT for all air pilot versions and 7/16-20 for all hydraulic pilot versions.


Seal Types

Buna-N or Viton®


Spool Options

Spool Diagrams* Type Spool Options ANSI Symbol
Type I Two position, positive lap spool used for conventional 4-way, 2-position applications. Can be used as a normally open or normally closed 3-way valve by simply plugging one cylinder port. Use for air and hydraulic service.

This spool type will be furnished unless otherwise specified.

Hydraulic

Pneumatic

Type II Three position, closed center spool with wide lands. All ports are blocked and isolated in the center position. Typically used for "position-and-hold" or "inching" circuits (will not hold position for long periods of time). Use for air and hydraulic service.

Hydraulic

Pneumatic

Type II-A Three position, closed center spool with wide lands that are tapered. All ports are blocked and isolated in the center position. The tapering of the lands provides a more linear flow versus spool travel and therefore better speed control. Typically used for "position-and-hold" or "inching" circuits (will not hold position for long periods of time). Use for air and hydraulic service.

Hydraulic

Pneumatic

Type IV Three position, cylinder ports blocked with cross drilled spool to allow pressure to bleed to tank port. Do not use in a "series" circuit and limit tank back pressure to 250 PSI maximum. Use for hydraulic service only.

Hydraulic

Type V Three position supply blocked with cylinder ports to tank (commonly referred to as exhaust open center in pneumatic terminology). Use for air and hydraulic service.

Hydraulic

Pneumatic

Type VI Three position, closed center spool with narrow lands (minimal lap). Spool movement yields almost immediate action. Must be used with sensing devices that will mechanically or electrically position the spool. Use for air and hydraulic service.

Hydraulic

Pneumatic

Type VI-A Three position, closed center spool with narrow, tapered lands (spools with positive or negative lap can be supplied for special applications). The tapered lands help decelerate the cylinder as the spool approaches the center position, which assists in reducing shock and system instability. May be used with sensing devices that will mechanically or electrically position the spool. Use for hydraulic service only.

Hydraulic

Type VII Two position specially machined spool that allows the valve to be used as either a 2-way normally open or normally closed unit. Valves with this spool function are supplied with a “loose plug” that can be customer installed in outlet port “A” or “B” to yield the normally open or normally closed function that is desired. These models may also be used as a pressure selector with two different pressures being piped into the cylinder ports while using the inlet port as a common outlet. The third type of function is to be used as a pressure diverter with the inlet pressure being diverted to one of the two outlet ports. Use for hydraulic service only. Note: Tank port must be left open.

Hydraulic
2-Way N/C

Hydraulic
2-Way N/O

Hydraulic
Diverter

Hydraulic
Selector

Type VIII Three position, all ports open to tank. Unique function that can also be suitable for negative lap servo applications. Use for hydraulic service only.

Hydraulic