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Summary of Contents for TLV DR8-3P
- Page 1 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021 Clean Steam Direct-acting Pressure Reducing Valve DR8-3P / DR8-3EP DR8-6P / DR8-6EP Copyright © 2021 by TLV CO., LTD. All rights reserved...
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Page 2: Table Of Contents
Troubleshooting .............. 20 Product Warranty ............22 Introduction Thank you for purchasing the TLV DR8 clean steam direct-acting pressure reducing valve. This product has been thoroughly inspected before being shipped from the factory. When the product is delivered, before doing anything else, check the specifications and external appearance to make sure nothing is out of the ordinary. -
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 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. 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021...
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Page 5: Specifications
(2.5 to 45 psig) (40 to 85 psig) Adjustable Pressure Range No more than a maximum of 75% of the primary pressure Minimum Adjustable Flow Rate Steam: 20 kg/h (44 lb/h) or more (1 MPa = 10.197 kg/cm 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021... -
Page 6: Correct Usage Of The Dr8 Direct-Acting Pressure Reducing Valve
NOTE: When installing a safety valve to protect steam-using equipment, be sure to install it on, or directly before, the inlet of the steam-using equipment. If the safety valve is installed between the DR8 and a control valve, an eventual pressure rise could activate the safety valve. 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021... - Page 7 10 d or more when a manual valve, a strainer or an elbow, etc. is installed. (Example: if nominal Steam size is 25 mm (1 in), Trap have 250 mm (10 in) Steam Trap or more) 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021...
- Page 8 Valve Valve valve is installed. (Two- 30 d or more stage pressure reduction) (Example: if nominal size is 25 mm (1 in), have 750 Steam mm (30 in) or more) Trap Steam Trap 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021...
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Page 9: Configuration
(1 in): 1 piece Number of parts: 2 pieces Number of parts for sizes 15 to 20 mm ( in): 4 pieces, 25 mm (1 in): 2 pieces For sizes 15 to 20 mm ( only 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021... -
Page 10: Installation
It is recommended that the inlet and DR-8 outlet pipes be supported securely. Piping 4. Maintenance Space Support Piping Leave sufficient space for maintenance, Support inspection and repair. A: 260 mm (10 B: 110 mm (4 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021... - Page 11 DR8 operating range limitations (when it is not possible to reduce to the desired pressure using a single pressure reducing valve). Bypass Valve Outlet Bypass Valve Valve Pressure Outlet Gauge Valve Secondary Side Pressure Gauge Inlet Steam Valve Trap Primary Inlet Steam Side Valve Trap Steam Trap 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021...
- Page 12 To perform blowdown, close the inlet valve (A) first, then the outlet valve (B), and open the bypass valve (C). Do not open valves too quickly. Safety Valve Bypass Valve (Relief Valve) Outlet Valve Secondary Inlet Pressure Side Gauge Valve Pressure Gauge Primary Side Steam Trap Steam Trap 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021...
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Page 13: Adjustment
8. After setting, hold the adjustment screw and retighten the locknut. 9. When shutting down the system, always close the outlet shut-off valve first and then the inlet valve. (If the inlet shut-off valve is closed first, the safety valve may be tripped.) 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021... -
Page 14: Maintenance
(Seat section) Valve If there is chattering or dirt, premature wear may result. (Seat section) Valve Guide, If hunting or chattering takes place, premature wear may result. (Slide Bearing) Gaskets Check for deformation or scratches 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021... -
Page 15: Disassembly
Then remove the from the piping, and secure it in a vise to perform the inspection. Disassembling the Adjustment Section Loosen the cap and the locknut first. Loosen the adjustment screw completely and remove the body clamp. 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021... - Page 16 Spring Washer Plain Washer Spacer Upper Diaphragm Retainer Diaphragm Protective Sheet Lower Diaphragm Retainer Retainer Gasket The upper diaphragm retainer, diaphragm, protective sheet, lower diaphragm retainer and retainer gasket can be removed after removing the locknut. 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021...
- Page 17 Remove the adapter and the inlet clamp gasket. (for sizes 15 to 20 mm ( in) only) Separate the valve guide from the body. The valve comes off with the valve guide. Valve Inlet Clamp Gasket Valve Guide 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021...
- Page 18 (for sizes 15 to 20 mm ( in) only) NOTE: Avoid using solvent to clean these parts as it may accelerate deterioration of the diaphragm, protective sheet, and resin part of the valve guide and retainer gasket. 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021...
- Page 19 Inlet Clamp Inlet Clamp Bolt * The slide bearing and snap ring cannot be removed individually as they are incorporated with the valve guide and must be replaced as a set with the valve guide. 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021...
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Page 20: Reassembly
(2.2) Body Clamp Nut, (2.2) Inlet Clamp Nut (1 Nm 10 kgcm) NOTE: If drawings or other special documentation were supplied for the product, any torque given there takes precedence over values shown here. 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021... -
Page 21: Troubleshooting
Check the flow rate, re-set the large pressure; check the model selection, replace with a more suitable unit if necessary* The adjustment screw has Replace with a new seized adjustment screw *For model selection and replacement, contact TLV. 172-65613MA-04 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 18 May 2021... - Page 22 *For model selection and replacement, contact TLV. NOTE: When replacing parts with new, use the parts list for reference and replace with parts from the Maintenance Kit, Repair Kit, etc. (Please note that replacement parts are only available in pre-packaged kits.)
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Page 23: Product Warranty
One year following product delivery. 2. Warranty Coverage TLV CO., LTD. warrants this product to the original purchaser to be free from defective materials and workmanship. Under this warranty, the product will be repaired or replaced at our option, without charge for parts or labor.
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