Relay Valves

A closed center design used for modulating output pressures up to 3000 PSI. Can be adapted to a variety of hydraulic systems. Power off-braking through limited stored energy in the accumulator(s). ZF also makes a hydraulic over air relay valve. These valves output air pressure in proportion to the hydraulic input pressure. Hydraulic input pressure, from a component such as a master cylinder or hydraulic control valve, sends a pilot signal to the relay valve to moderate air brake pressure.

Related Product Information

Application Data Sheet - Brake Valves (Form Number 80-460-042)

This sheet is used for Brake Valve System applications.

ZF uses application data sheets to collect machine and/or vehicle information specific to an application. They are also helpful for understanding the environment and manner in which the machine/vehicle will be operated. Our Engineering Department uses application data sheet information to select suitable brake components that are designed to meet your application needs.

ZF holds this information in strict confidence. Your machine/vehicle information is strictly for application assistance and will not be sold or shared with anyone outside of ZF.

Hydraulic Brake Valves Catalog (Form Number 84-466-001)

This 64-page catalog is loaded with features, model numbers and specifications.

Hydraulic over Air Relay Valves (Form Number 80-460-051)

A two-page Product Bulletin with product description, specifications, and ANSI symbols. There are also ratio graphs and dimensional drawings.

ZF Off-Highway Product Guide (Form Number 80-950-006)

This is our introductory catalog for ZF Off-Highway Solutions Minnesota Inc. products. It provides product photos and brief descriptions of the product portfolio offerings in brakes, brake actuation, valves, and controls.