SAE J1859 pdf download
SAE J1859 pdf download.Test Procedures for Determining Air Brake Valve Input-Output Characteristics.
1. This SAE Recommended Practice establishes uniform test procedures for determining input-output characteristics for those pilot-operated and mechanically actuated, modulating-type valves and through-type valves used In the service brake control system.
1.1 Input-Output CharacteristIcs:
a. Crack (opening) pressure or force
b. Pressure diflerential (input-output)
c. Hysteresis (Increasing-decreasing pressure)
1.2 Pilot-Operated Modulating-Type Valves:
a. Relay Valve
b. Ratio relay valve
c. Decaying ratio relay valve
d. Booster relay valve
1.3 Mechanically Actuated Modulating-Type Valves
a. Dual service brake valve
1.4 Through-Type Valves
a. Quick release valve
b. Tractor protection valve
c. Limiting valve
15 Purpose—This document is intended as a guide toward standard practice but may be subØct to frequent change to keep pace with experience and technical advances, and this should be kept in mind when considering its use. This document provides a uniform definition of input-output characteristics of pneumatic valves designed to operate in 862 kPa (125 psi) nominal pressure air brake systems and establishes uniform test procedures to determine these characteristics. This document serves as a supplement to SAE J1409.
2. References
2.1 Applicable Publications—The following publications form a part of this specification to the extent specified herein. Unless otherwise specified, the latest issue of SAE publications shall apply.
2.1.1 SAE PUBUcAU0NS—Available from SAE, 400 Commonwealth Drive. Warrendale, PA 15096-0001.
SAE J844—Nonmelallic Air Brake System Tubing
SAE Ji 402—Automotive Air Brake Hose and Hose Assemblies
SAE J1 409—Air Brake Valves Test Procedure
SAE J1410—Air Brake Valve—Performance Requirements
3. Definitions
3.1 Crack Pressure or Force—The increasing input pessure or input force to initiate an output pressure or flow
resulting in a transducer reading.
3.2 Pressure Differential—The difference between the increasing input pressure and the increasing output pressure at pressures above the crack pressure.
3.3 HysteresIs—The difference in the input pressure between the increasing and decreasing output curve at a given output pressure.
3.4 Relay Valve—A pneumatically actuated valve used to remotely control the application and release of air pressure.
3.5 Ratio Relay Valve—A relay valve with a fixed ratio of output pressure to input pressure.
3.6 DecayIng Ratio Relay Valve—A relay valve with a variable ratio 01 increased output pressure to the input pressure that decays in time to a one-to-one ratio.
3.7 Booster Relay Valve—A relay valve that initially sends the output pressure to one or more outlet ports faster than to the other pons but balances to equal pressure at all output ports.
3.8 Quick Release Valve-A valve which accelerates the release of air pressure.
3.9 Dual Service Brake Valve-A service brake valve that has a primary (No. 1) system that is mechanically actuated and a secondary (No. 2) system that is pneumatically actuated by the primary system or mechanically actuated in the event of the loss of primary system pressure. Each system has its own input and output circuit.
3.10 Tractor Protection Valve—A pneumatically actuated shutoff valve that controls the application and release of service and supply pressure to the towed vehicle.
3.11 Limiting Valve-A valve that reduces the amount of output pressure by a fixed percentage of the input pressure. This reduction may be foi- all input pressures or the output pressure may gradually blend back to the full input pressure.
4. General Notes
4.1 Temperature—Unless otherwise specified, all testing shall be conducted at a temperature of 12 to 30 C (60 to 90 F) inclusive.
4.2 Mounting—All testing shall be conducted with the valve mounted essentially as in service. The actual mounting position of each test shall be recorded.
