"N-1-A" REDUCING VALVE, Part No with "N" REDUCING VALVE PORTION, Part No

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1 "N-1-A" REDUCING VALVE, Part No with "N" REDUCING VALVE PORTION, Part No DECEMBER, 1984 NOTE: The following description and operation is based on this device and its components being new or this device and its components having been repaired, tested, installed and maintained in accordance with instructions issued by this and any other applicable Wabtec Corporation publications WARNING: At the time any part is replaced in this device, the operation of the complete device must pass a series of tests prescribed in the latest issue of the applicable Wabtec Test Specification. At the time this device is applied to the brake equipment arrangement, a stationary vehicle test must be made to insure that this device functions properly in the total brake equipment arrangement. (Consult your local Wabtec Representative for identity of the test specification, with latest revision date, that covers this device.) A IMPORTANT: Only Wabtec supplied parts are to be used in the repair of this device in order to obtain satisfactory operation. Commercially available non- O.E.M. parts are unacceptable. NOTE: The part numbers and their associated descriptions are the property of Wabtec Corporation and may not be replicated in any manner or form without the prior sole written consent of an Officer of Wabtec Corporation WABCO Locomotive Products. A Wabtec Company. All rights reserved Page 1 of 8 December, 1984

2 1.0 DESCRIPTION 1.1 N-1-A REDUCING VALVE, Pc. No Designed for use in equipment arrangements where the air pressure does not exceed 150 psig, this N-1-A Reducing Valve consists of an N Reducing Valve Portion, Pc. No and a Pipe Bracket Portion, Pc. No The Pipe Bracket Portion is designed to be semi-permanently attached to the piping of the equipment arrangement through the use of WABCO Flange Type Fittings. All pipe connections are made to the Pipe Bracket. The N Reducing Valve Portion is secured to the Pipe Bracket by two 3 /8" hex nuts. This arrangement allows for the removal and replacement of the Reducing Valve Portion without disturbing the piping of the equipment arrangement. Inlet and Exhaust Valve Unit Diaphragm Exhaust Control Spring EX. IN (Supply) OUT (Delivery) Adjusting Screw A four digit suffix code number is included as part of the piece number of the N-1-A Reducing Valve. This suffix code indicates the pressure setting of the valve. For example: Pc. No indicates an N-1-A Reducing Valve with a pressure setting of 95 pounds. Consult your Wabtec Corporation Representative for the proper N-1-A Reducing Valve and installation instructions for specific applications. 1.2 N REDUCING VALVE PORTION, Pc. No This small capacity, self-lapping, diaphragm operated type regulating valve functions to reduce an air supply pressure to that of a lower delivery pressure. The delivery pressure is determined by a control spring force that is adjustable within specific limits. The Portion is designed to be mounted to a manifold or pipe bracket in such a way that it can be removed for servicing or repair without disturbing the piping of the equipment arrangement. 2.0 OPERATION AND ADJUSTMENT (FIGURE 2) 2.1 OPERATION A control spring force under the diaphragm causes the exhaust valve seat to seal against a ball valve that is part of a two-ball valve dumbbell type inlet and exhaust valve unit. The two-ball valve is forced up to open the inlet valve. Supply air can then flow past the open inlet valve into the delivery passage and to the face of the diaphragm, forcing the diaphragm assembly down and compressing the control spring. When air pressure on the diaphragm equals the spring force, the two-ball valve will move down to seal the inlet valve. In this position, the Reducing Valve Portion is in a lap position, since both the inlet and exhaust valves are closed. If delivery air pressure is reduced for any reason, This diagrammatic representation is for functional analysis only. It is not to be used as an actual physical representation of portion or pipe bracket configurations. the control spring will again raise the two-ball valve to open the inlet valve, thus increasing the delivery pressure to that which is again equal to the spring force. If delivery air pressure is greater than the control spring force for any reason, the diaphragm assembly will move down to open the exhaust valve. The control spring will return the diaphragm assembly to lap position when delivery pressure on the diaphragm is again equal to the control spring force. 2.2 ADJUSTMENT Figure 2 - Diagrammatic View Manual adjustment of delivery pressure is made at the adjusting screw on the control spring. If a higher pressure is desired, the tension on the spring is increased so that a higher delivery pressure will be required to lap the valve portion. If a lower pressure is desired, the tension on the spring is lessened so that a lower delivery pressure will be required to lap the valve portion. 3.0 MAINTENANCE SCHEDULE IMPORTANT: The N Reducing Valve Portion should be removed from the equipment arrangement, taken to the shop, be completely disassembled, the parts cleaned, lubricated, assembled, and the Portion tested according to the following vehicle application schedule or more frequently if service conditions so indicate. December, 1984 Page 2 of 8

3 RECOMMENDED FREQUENCY - TYPE OF APPLICATION AT LEAST ONCE EVERY Locomotives Passenger (Interstate) Transit 4.0 PARTS CATALOG INFORMATION 12 Months 36 Months 24 Months Refer to the current issue of the Wabtec Corporation Parts Catalog when ordering replacement parts for the N- 1-A Reducing Valve or any of the component parts. NOTE: The reference numbers used in this publication and those used in the parts catalog may differ. Check the descriptive parts name to be sure that the desired part is ordered. 5.0 SAFETY PROCEDURES AND WARNINGS Regular operating property and shop safety procedures MUST BE followed. The work area should be clean. WARNING: The following statements of warning apply all or in part wherever the symbol appears in the maintenance procedures. Failure to observe these precautions may result in serious injury to those performing the work and/or bystanders. The use of an air jet, which must be less than 30 p.s.i.g., to blow parts clean or to blow them dry after being cleaned with a solvent will cause particles of dirt and/or droplets of the cleaning solvent to be airborne. Wire brushing may also cause particles of dirt, rust, and scale to become airborne. These conditions may cause skin and/or eye irritation. When using an air jet, do not direct it toward another person. Improper use of air jet could result in bodily injury. Personal eye protection must be worn when performing any work on this device or its components parts to avoid any possible injury to the eyes. The use of solvents as cleaning agents and the use of lubricants can involve health and/or safety hazards. The manufacturers of the solvents and lubricants should be contacted for safety data (such as OSHA Form OSHA-20 or its equivalent). The recommended precautions and procedures of the manufacturers should be followed. When performing any test or work on devices or equipment while they are on the vehicle (on car test, etc.) special precautions must be taken to insure that vehicle movement will not occur which could result in injury to personnel and/or damage to equipment. Assembly may be under a spring load. Exercise caution during disassembly so that no parts Fly Out and cause bodily injury. All air supply and/or electric current to this device and/or to any components part must be cut-off before this device and/or any component part is removed from the equipment arrangement. Bottled up air under pressure (even though air supply is cut-off) may cause gaskets and/or particles of dirt to become airborne and an increase in sound level when this device and/or any component part is removed from the equipment arrangement. To prevent receiving electrical shock when performing electrical tests, hands must be clear of electrical components, contacts and housing and the required "in-lab" grounding procedures must be strictly adhered to. A wooden work bench should be used. Failure to heed this WARNING could result in severe injury or death. An adequate support or lifting device must be available to support the Device and/or Valve Portion(s) during removal, installation and maintenance procedures. 6.0 CLEANING SOLVENT AND LUBRICANT 6.1 CLEANING SOLVENT The solvent used to clean reusable parts MUST BE an aliphatic organic solution such as mineral spirits or naphtha, that will dissolve oil or grease, and that will permit all parts to be cleaned without abrasion. 6.1 The solvent used for cleaning the metal parts of the Reducing Valve and Valve Portion MUST BE an aliphatic organic solution such as mineral spirits or naphtha, that will dissolve oil or grease, and that will permit all parts to be cleaned without abrasion. Page 3 of 8 December, 1984

4 1 Hex Steel Valve Portion. If NOT, return the Portion to the shop and obtain one with these parts in place or install NEW strainers, Pc. No , and gaskets, Pc. No The strainers and gaskets are a part of the Reducing Valve Portion. 7/ /16 Dia. Drill 2-1/8 3/16 Steel Rod 1-3/ Observe ALL safety precautions and WARNINGS as listed in Section Remove ALL free dirt from the exterior surfaces of the N-1-A Reducing Valve by wiping with a clean, lint-free cloth or by blowing clean with a low pressure jet of clean, dry air. Number 12 Drill 1/64 Chamfer Remove the N Reducing Valve Portion (9) from the Pipe Bracket (12) by first removing the two 3 /8" hex nuts (8) Remove and SCRAP the two fitting gaskets (10). Figure 3 - Holding Fixture (Dwg. R-42-1) 6.2 #2 Silicone Grease, Wabtec Corporation Specification M , is used to lubricate the o-rings, o-ring grooves, and the bearing surface of the bushings into which the o-ring assemblies are installed. 7.0 SPECIAL TOOL In addition to the regular shop tools, a holding fixture for disassembling and assembling the exhaust valve unit MUST BE available to the repair person. Dimensions and specifications for making this fixture are shown in Figure 3. IMPORTANT: The information shown in Figure 3 for making the holding fixture is furnished as a convenience. The Wabtec Corporation of American Standard Inc. (WABCO) shall have no responsibility for tools which they do not manufacture and will not be responsible for the results when using such tools (including claims by third parties). 8.0 MAINTENANCE PROCEDURES - ON-CAR 8.1 REMOVAL & REPLACEMENT OF N REDUCING VALVE PORTION (FIGURE 1) The following parts MUST BE available to the repair person: A NEW or repaired and tested N Reducing Valve Portion, Pc. No NOTE: Be sure that the two wire strainers (11) and fitting gaskets (11) are in place in the mounting face of the Reducing Visually inspect the Pipe Bracket (12) to be sure that it is not damaged and that all pipe connections are secure. It is not necessary to remove the Pipe Bracket unless it is damaged. If it is removed, ALL fitting gaskets MUST BE replaced with NEW parts. Contact your Wabtec Corporation Representative for fittings and gaskets for specific applications. Visually inspect the Portion mounting face of the Pipe Bracket to be sure that it is clean and that the ports are not restricted. If necessary, the ports may be blown out with a low pressure jet of clean, dry air Remove all protective material from the NEW or repaired and tested N Reducing Valve Portion (9). BE SURE to remove the tape that secures the two gaskets (10) and strainers (11) in the ports of the mounting face of the Portion Observing that the two strainers (11) and gaskets (10) remain in position, install the N Reducing Valve Portion (9) on the Pipe Bracket (12) and secure it in place using two 3 / 8" hex nuts (8) IMPORTANT: Whenever any Portion of the N-1-A Reducing Valve is removed from the equipment arrangement, for any reason, and it is reinstalled or replaced with a NEW or repaired and tested Portion, a stationary vehicle air brake test MUST BE made to be sure that the Portion and the N- 1-A Reducing Valve function properly in the brake equipment arrangement Provide adequate protection for the removed Reducing Valve Portion to prevent dirt or moisture from entering it and transport it to the shop area for maintenance. December, 1984 Page 4 of 8

5 MAINTENANCE PROCEDURE - N REDUCING VALVE PORTION - IN SHOP IMPORTANT: To obtain satisfactory operation and reliability of this device, ONLY replacement parts supplied by the Wabtec Corporation are to be used in the maintenance of this device. 9.1 DISASSEMBLY (FIGURE 4) A NOTE: DO NOT use sharp or hard metal tools to remove o- rings, gaskets, or the diaphragm. Exercise care so that no damage occurs to the metal parts Remove the two strainer gaskets (1) and the two strainers (2) from the manifold mounting face of the body (18), if not already removed. SCRAP the two gaskets (1) IMPORTANT: Turn the adjusting screw (17A) located in the spring housing (17) counterclockwise, as viewed from the spring housing end, TO RELIEVE THE TENSION on the regulating valve spring (15) BEFORE ATTEMPTING THE DISASSEMBLY. 13 NOTE: It is not necessary to separate the adjusting screw (17A) from the housing during disassembly unless it is damaged, but care must be taken to insure all spring tension is removed before proceeding to prevent personal injury CAUTION: During the following procedure, exercise care so that the housing (17), spring seat (16), or spring (15), do not fly out and cause bodily injury. Carefully remove and SCRAP the four 5 /16" elastic stop hex nuts (3, 4) which secure the spring housing (17) to the body (18) Remove the spring housing (17), diaphragm-exhaust valve seat assembly (10, 11, 12, 13, 14) as a unit, the spring (15) and spring seat (16) Remove the two 5 /16" cap screws (5) from the body (18). 3 4 NOTE: The studs (18A) need not be removed from the body (18) unless they are damaged. 17A Figure 4 - "N" Reducing Valve Portion Exploded View Disassemble the exhaust valve seat assembly (10, 11, 12, 13, 14, 15) by removing the following parts from the exhaust valve seat (14) /4" O.D. o-ring (10) Page 5 of 8 December, 1984

6 /16" Hex nut (11) Follower (12) Diaphragm (13) SCRAP the o-ring (10) and diaphragm (13) Remove the exhaust valve spring (9) from the body (18) Remove the inlet and exhaust valve unit with o-rings (7, 8) from the body (18) Remove and SCRAP the two 3 /4" O.D. o-rings (7) from the valve unit (8). (FIGURE 5) Disassemble the inlet and exhaust valve unit (8) as follows: The use of the holding fixture as shown in Figure 3 is required. Insert the dumbbell end of the inlet and exhaust valve into the holding fixture so that the cross drill in the holding fixture aligns with the cross drill in the tapered end of the inlet valve seat Insert the 3 /16" steel rod through the cross drill of the holding fixture and into the cross drill of the inlet valve seat. 9.2 CLEANING & INSPECTING NON-REUSEABLE PARTS ALL gaskets, o-rings, elastic stop nuts, the dirt protector, and the diaphragm are to be SCRAPPED and replaced with NEW Wabtec Corporation Parts REMAINING PARTS Wash all remaining parts in the cleaning solvent described in Section 6.1. Springs may be wire brushed to assist in the removal of any dirt, rust, or scale After the parts have been cleaned, they MUST BE completely dried. Use a low pressure jet of clean, dry air to blow the parts dry Inspect the parts. Replace any spring that is rusted, pitted, distorted, damaged in any way, or if it has taken a permanent set. Refer to Parts Catalog for spring information and identification. Replace any part that is cracked, cut, broken, worn excessively, damaged, or that is in such a condition that may result in the unsatisfactory operation of the N Reducing Valve Portion. 9.3 ASSEMBLY (Figure 5) The use of the holding fixture shown in Figure 3 is required during the following procedure Carefully remove the housing from the inlet valve seat Remove the spring from the inlet valve seat Remove the 3 /16" steel rod from the inlet valve seat and the holding fixture Remove the inlet valve seat assembly from the holding fixture Remove and SCRAP the dirt protector (6) from the body (18). Prick punch leading thread on assembly or reassembly, sufficient to prevent assembly from working loose during normal operation Housing, Part No Spring, Part No Inlet Valve Seat Assembly, Part No Figure 5 - Inlet and Exhaust Valve Unit - ASSEMBLY December, 1984 Page 6 of 8

7 Assemble the inlet and exhaust valve unit as follows: Insert the dumbbell end of the inlet valve seat into the holding fixture so that the cross drill in the holding fixture aligns with the cross drill in the tapered end of the inlet valve seat Insert the 3 /16" steel rod through the cross drill of the holding fixture and into the cross drill of the inlet valve seat Insert the inlet valve spring into the inlet valve seat Assemble the housing onto the inlet valve seat. CAUTION: EXERCISE CARE THAT THE SPRING DOES NOT INADVERTANTLY FLY OUT AND CAUSE BODILY INJURY IMPORTANT: Prick punch the leading thread of the seat assembly sufficiently to prevent the inlet and exhaust valve unit from coming apart during normal operations Remove the 3 /16" steel rod from the inlet valve seat and the holding fixture Remove the inlet and exhaust valve unit from the holding fixture Using #2 Silicone Grease, Wabtec Corporation Specification M , coat the surfaces of two NEW 3 /4" O.D. ( 9 /16" I.D.) o-rings (7) and a NEW 3 /4" O.D. ( 5 /8" I.D.) o- ring (10). Also fill the o-ring grooves of the inlet and exhaust valve unit (8) and exhaust valve seat (14) and lubricate the bearing surfaces of the valve bushing of the body (18) with the lubricant Install the two NEW lubricated 3 /4" O.D. ( 9 / 16 " I.D.) o- rings (7), these are the thicker of the three o-rings, into their grooves on the inlet and exhaust valve unit (8). Remove ANY excess lubricant by wiping with a clean, lint-free cloth Install the NEW lubricated 3 /4" O.D. ( 5 /8" I.D.) o-ring (10) in its groove on the exhaust valve seat (14). Remove any excess lubricant by wiping with a clean, lint-free cloth If the adjusting screw (17A) was removed from the spring housing (17), it MUST BE replaced at this time. Insert screw a minimum number of threads to prevent spring tension during assembly Install the spring seat (16), spring (15), and diaphragm-exhaust valve seat assembly with o-ring (10, 11, 12, 13, 14) into the spring housing (17) Install the inlet and exhaust valve spring (9) onto the unit (8) which was previously installed in the body (18) CAUTION: During the following procedure, spring (15) may be under tension. Exercise care so that no parts are inadvertently expelled and cause bodily injury BE SURE that the exhaust opening in the spring housing (17) is facing in the direction of the mounting face of the body (18), place the spring housing assembly (10 to 17A) in position on the body (18) Install the two 5 /16" x 1 3 /8" hex head cap screws (5) through the aligned holes of the spring housing (17) and the body (18) Install two NEW 5 /16" elastic stop nuts (3) on the two 5 /16" screws (5) and two NEW 5 /16" elastic stop nuts (4) on the two 5 /16" studs (18A) of the body (18). Equally cross tighten the nuts (3, 4) to secure the body and spring housing assemblies (17, 18) together MAKE SURE the two strainers (2) and two NEW gaskets (1) are installed into the ports of the manifold mounting face of the body (18). A piece of tape may be used to hold the gaskets (1) in place Install the dirt protector (6) over the housing end of the inlet and exhaust valve unit (8) and onto the body (18) Insert the inlet and exhaust valve unit with o-rings (7), housing end first, into the valve body (18) Assemble the diaphragm and exhaust valve seat as follows: Place a NEW diaphragm (13) and diaphragm follower (12) on the exhaust valve seat (14) Secure the diaphragm (13), follower (12), and seat (14) together with the 9 /16" hex nut (11). Page 7 of 8 December, 1984

8 10.0 TESTING & ADDITIONAL INFORMATION 10.1 After the N Reducing Valve Portion, Pc. No , has been assembled, BUT BEFORE it is returned to service, it MUST pass a series of tests following the procedures of the current issue of one of the following Wabtec Corporation Test Specifications: T-1598-O T-1605-O T-1655-O T-2100-O T-2132-O 10.2 When remounting the Portion on the manifold or pipe bracket, NEW gaskets MUST BE used. See Section IMPORTANT: Whenever the N Reducing Valve Portion is removed from an equipment arrangement, for any reason, and it is reinstalled or replaced with a NEW or repaired and tested Portion, a stationary vehicle air brake test MUST BE made to be sure that the Portion and the N- 1-A Reducing Valve function properly in the equipment arrangement Consult your Wabtec Corporation Representative if additional information is required. NOTE: Check Test Specification for Piece Number of Portion being tested. WABCO Locomotive Products 1001 Air Brake Avenue Wilmerding, PA (412) Fax (412) December, 1984 Page 8 of 8

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