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Summary of Contents for TLV A-DR20-2
- 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...
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Page 2: Table Of Contents
Also be sure to read this manual carefully before use and follow the instructions to be sure 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*. -
Page 3: Safety Considerations
The three types of cautionary items above are very important for safety: be sure to observe all of them as they relate to installation, use, maintenance, and repair. Furthermore, TLV accepts no responsibility for any accidents or damage occurring as a result of failure to observe these precautions. - Page 4 Do not use excessive force when connecting threaded pipes to CAUTION the product. Over-tightening may cause breakage leading to fluid discharge, which 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.
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Page 5: Specifications
Adjustable Range * 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 0.2 – 1.0 MPaG 0.6 – 1.0 MPaG Primary Pressure Range (30 –... -
Page 6: Configuration
Configuration Name 1 Body 2 Cover 3 Screen 4 Coil Spring 5 Main Valve 6 Valve Seat Gasket 7 Valve Seat 8 Spacer* 9 Snap Ring 10 Valve Stem 11 Bellows ... -
Page 7: Correct Usage Of The A-Dr20 Direct-Acting Pressure Reducing Valve
Correct Usage of the A-DR20 Direct-acting Pressure Reducing Valve Install properly and DO NOT use this product outside the recommended operating pressure, temperature and other specification ranges. CAUTION Improper use may result in such hazards as damage to the product or malfunctions which may lead to serious accidents. - Page 8 4. Recommended Straight Pipe Runs In order to ensure a stable flow of air, the piping upstream and downstream of the A-DR20 must be straight runs. If the A-DR20 is installed either directly before or after an elbow or control valve, unevenness in flow may result in chattering and unstable pressure.
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Page 9: Installation
Installation Install properly and DO NOT use this product outside the recommended operating pressure, temperature and other specification ranges. CAUTION Improper use may result in such hazards as damage to the product or malfunctions which may lead to serious accidents. Local regulations may restrict the use of this product to below the conditions quoted. - Page 10 6. Piping Size/Diffuser If the secondary air flow Open velocity is expected to be more than 30m/s (100 Diffuser ft/s), install a diffuser in order to keep the flow velocity below 30m/s Closed Primary Secondary A-DR20 (100 ft/s). If the distance Closed Side Side...
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Page 11: Adjustment
Adjustment To avoid problems such as water hammer and to protect air-using equipment, the A-DR20 should be properly adjusted. 1. It is necessary to blow down all pipe lines thoroughly. The blowdown is especially important if the line is new or has been shut down for a long period of time. -
Page 12: Disassembly
Disassembly When disassembling or removing the product, wait until the internal pressure equals atmospheric pressure and the surface of the product CAUTION has cooled to room temperature. Disassembling or removing the product when it is hot or under pressure may lead to discharge of fluids, causing burns, other injuries or damage. - Page 13 Disassembling the Bellows Section Remove the bellows from the body, then the valve stem. Pinch the straight sections of the snap ring that is holding the spacer together using a tool such as needle-nose pliers and remove the snap ring. Remove the spacer. Valve Stem Bellows Snap Ring...
- Page 14 Exploded View Adjustment Handle Valve Seat Locknut Valve Seat Coil Gasket Spring Cover Bolt Main Valve Bellows Coil Spring Cover Gasket Screen Cover Snap Ring Body Retaining Ring Steel Ball Spring Guide Valve Stem Snap Ring Slide Bearing Spacer Insert the snap ring so that both ends are facing down.
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Page 15: Reassembly
Reassembly Assemble the unit using the same procedure as used for disassembling it; but in reverse order. Observe the following precautions: The PTFE gaskets may be re-used if free from fault, crushing or deformation. Apply anti-seize to the steel ball and threaded portions of screws, bolts and the adjustment handle. -
Page 16: Troubleshooting
Troubleshooting When disassembling or removing the product, wait until the internal pressure equals atmospheric pressure and the surface of the product CAUTION has cooled to room temperature. Disassembling or removing the product when it is hot or under pressure may lead to discharge of fluids, causing burns, other injuries or damage. - Page 17 Problem Symptom Cause Remedy Adjustment is The adjustment handle has Replace with a new secondary difficult and set seized adjustment handle pressure pressure varies The holes in the spacer are Clean cannot be clogged adjusted or The slide bearing is Replace with a new spacer increases distorted or damaged...
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Page 18: Tlv Express Limited Warranty
Subject to the limitations set forth below, TLV CO., LTD., a Japanese corporation (“TLV”), warrants that products which are sold by it, TLV International Inc. (“TII”) or one of its group companies excluding TLV Corporation (a corporation of the United States of America), (hereinafter the “Products”) are designed and manufactured by... - Page 19 WARRANTY NOT NEGATED HEREBY, AND ANY IMPLIED WARRANTY NOT NEGATED HEREBY, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, DO NOT COVER, AND NEITHER TLV, TII NOR ITS TLV GROUP COMPANIES WILL IN ANY EVENT BE LIABLE FOR, INCIDENTAL OR...
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Page 20: Service
Service For Service or Technical Assistance: Contact your TLV representative or your regional TLV office. In Europe: Tel: [49]-(0)7263-9150-0 Daimler-Benz-Straße 16-18, 74915 Waibstadt, Germany Fax: [49]-(0)7263-9150-50 Tel: [44]-(0)1242-227223 Units 7 & 8, Furlong Business Park, Bishops Cleeve, Gloucestershire GL52 8TW, U.K.
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