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172-65634MAJ-03 (A-DR20) 6 October 2021

Direct-acting Pressure Reducing Valve for Air

A-DR20-2/A-DR20-6/A-DR20-10

Copyright © 2021 by TLV CO., LTD.

All rights reserved

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Summary of Contents for A-DR20-10

Page 1: ...172 65634MAJ 03 A DR20 6 October 2021 Direct acting Pressure Reducing Valve for Air A DR20 2 A DR20 6 A DR20 10 Copyright 2021 by TLV CO LTD All rights reserved ...

Page 2: ...of using the product properly The TLV A DR20 is a direct acting pressure reducing valve for air which adopts a soft seat design on the main valve and minimizes the lockup pressure It also provides a more stable secondary pressure than conventional direct acting reducing valves The A DR20 is designed for a long service life and is made of stainless steel for superior durability For products with sp...

Page 3: ...there is a potential threat of death or serious injury Indicates that there is a possibility of injury or equipment product damage Install properly and DO NOT use this product outside the recommended operating pressure temperature and other specification ranges Improper use may result in such hazards as damage to the product or malfunctions that may lead to serious accidents Local regulations may ...

Page 4: ...ch may cause burns or other injury Use only under conditions in which no freeze up will occur Freezing may damage the product leading to fluid discharge which may cause burns or other injury Use only under conditions in which no water hammer will occur The impact of water hammer may damage the product leading to fluid discharge which may cause burns or other injury CAUTION ...

Page 5: ... Refer to the product nameplate for detailed specifications Valve No is displayed for products with options This item is omitted from the nameplate when there are no options Acceptable Operating Range Model A DR20 2 A DR20 6 A DR20 10 Primary Pressure Range 0 2 1 0 MPaG 30 150 psig 0 6 1 0 MPaG 85 150 psig Pressure Adjustable Range 0 014 0 2 MPaG 2 30 psig but limited to 1 30 of primary pressure 0...

Page 6: ...de 15 Steel Ball 16 Cover Bolt 17 Locknut 18 Adjustment Handle 19 Nameplate 20 Retaining Ring 21 Slide Bearing 3 4 22 Snap Ring 3 4 1 Replacement parts are available only in the following kits A Maintenance Kit B Repair Kit for Spacer C Repair Kit for Main Valve D Repair Kit for Bellows 2 Rubber standard fluorine rubber is used in the seating area The rubber is inlaid in the main valve 3 Number of...

Page 7: ...arily To save energy install the on off valve as near to the boiler or compressor as possible NOTE To prevent water hammer it is recommended that a slow acting motorized on off valve be used If a fast acting solenoid valve is used the potential water hammer effect can damage the air using equipment and the pressure reducing valve 3 Installing a Control and or Safety Valve A control valve i e for t...

Page 8: ...al size is 25 mm 1 in have 750 mm 30 in or more Maintain a straight piping run of 30 d or more when another pressure reducing valve is installed Two stage pressure reduction Example if nominal size is 25 mm 1 in have 750 mm 30 in or more 2 Outlet secondary side of the A DR20 Maintain a straight piping run of 15 d or more when a manual valve a strainer or an elbow etc is installed Example if nomina...

Page 9: ... be sure to blow down all piping thoroughly If this is not possible perform a blowdown using the bypass valve Blowdown is especially important for newly installed piping or after the system has been shut down for a long period of time 2 Removing the Protective Caps Before installation be sure to remove all protective seals and caps covering the product inlet and outlet Found in 2 locations on the ...

Page 10: ...ating range limitations such as when the reduction ratio is greater than 30 1 8 Accessories Always install a shut off valve pressure gauge and bypass lines at both inlet and outlet Ball valves which will not retain condensate are recommended for inlet and outlet shut off valves The bypass pipe should be at least of the size of the inlet primary pipe A DR20 Open Closed Closed Primary Side Secondary...

Page 11: ... shutting down the system always close the outlet shut off valve first and then the inlet valve Maintenance Take measures to prevent people from coming into direct contact with product outlets Failure to do so may result in burns or other injury from the discharge of fluids CAUTION Be sure to use only the recommended components when repairing the product and NEVER attempt to modify the product in ...

Page 12: ...ial run of a new line or before or after equipment is taken out of service for a long period of time Installation inspection maintenance repairs disassembly adjustment and valve opening closing should be carried out only by trained maintenance personnel Remove all pressurized air from the piping both upstream and downstream Remove the A DR20 from the piping and secure it in a vise to perform disas...

Page 13: ...e rubber is inlaid in the main valve and cannot be removed The main valve itself must be replaced Cleaning After inspection and removal of any abnormality clean and reassemble the parts The following parts will require cleaning before reassembly Threads of the adjustment handle threads of the cover bellows valve stem main valve valve seat spacer including slide bearing screen It is permissible to ...

Page 14: ...e main valve and cannot be removed The main valve itself must be replaced Valve Seat Valve Seat Gasket Main Valve 3 Coil Spring Screen Body Adjustment Handle Locknut Cover Bolt Cover Retaining Ring Steel Ball Spring Guide Spacer Slide Bearing 1 Slide Bearing 1 Snap Ring 1 Snap Ring 1 Bellows Cover Gasket Snap Ring 2 Valve Stem Coil Spring 2Insert the snap ring so that both ends are facing down ...

Page 15: ... one at a time in a diagonal pattern alternately to provide uniform seating 4 After assembly make sure that the valve stem operates smoothly without binding As shown in the figures above when the main valve is tightened it may become off centered on the valve seat If this occurs move the main valve back to center 5 Standard torque for fastening the respective screws and the width across flats of t...

Page 16: ...the Acceptable Operating Range Correct Usage of the A DR20 Direct acting Pressure Reducing Valve and Adjustment sections be reviewed Problem Symptom Cause Remedy The secondary pressure does not rise Pressure does not increase No air is being supplied Check the primary secondary piping and valves of the unit The valve at the primary side is closed The entrance to the screens or strainer is clogged ...

Page 17: ... too low Check the flow rate check the model selection replace with a unit that has smaller nominal diameter or a more suitable unit if necessary Hunting never stops There is too high a reduction ratio Use two stage reduction The selected model is inappropriate for the service conditions specifications Check the model selection replace with a more suitable unit if necessary Chattering never stops ...

Page 18: ...beyond the control of TLV TII or TLV group companies or 6 improper storage maintenance or repair or 7 operation of the Products not in accordance with instructions issued with the Products or with accepted industry practices or 8 use for a purpose or in a manner for which the Products were not intended or 9 use of the Products in a manner inconsistent with the Specifications or 10 use of the Produ...

Page 19: ...ISASSEMBLY AND SHIPMENT OF THE DEFECTIVE PRODUCT INJURY TO OTHER PROPERTY DAMAGE TO BUYER S OR THE FIRST END USER S PRODUCT DAMAGE TO BUYER S OR THE FIRST END USER S PROCESSES LOSS OF USE OR OTHER COMMERCIAL LOSSES WHERE DUE TO OPERATION OF LAW CONSEQUENTIAL AND INCIDENTAL DAMAGES UNDER THIS WARRANTY UNDER ANY OTHER EXPRESS WARRANTY NOT NEGATED HEREBY OR UNDER ANY IMPLIED WARRANTY NOT NEGATED HERE...

Page 20: ...oad Nunawading Victoria 3131 Australia Tel Fax 61 0 3 9873 5610 61 0 3 9873 5010 In East Asia 36 Kaki Bukit Place 02 01 02 Singapore 416214 Tel Fax 65 6747 4600 65 6742 0345 Room 5406 No 103 Cao Bao Road Shanghai China 200233 Tel Fax 86 0 21 6482 8622 86 0 21 6482 8623 No 16 Jalan MJ14 Taman Industri Meranti Jaya 47120 Puchong Selangor Malaysia Tel Fax 60 3 8065 2928 60 3 8065 2923 252 94 K L 17th...

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