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172-65119MA-01 (PN-DR) 13 June 2013

Pneumatic Direct-acting Pressure Reducing Valve

for Steam and Air

PN-DR

Manufacturer

ISO9001/ISO14001

Kakogawa, Japan

is approved by LRQA LTD. to ISO 9001/14001

Содержание PN-DR

Страница 1: ... 13 June 2013 Pneumatic Direct acting Pressure Reducing Valve for Steam and Air PN DR Copyright 2013 by TLV CO LTD All rights reserved Manufacturer ISO9001 ISO14001 Kakogawa Japan is approved by LRQA LTD to ISO 9001 14001 ...

Страница 2: ... is out of the ordinary Also be sure to read this manual carefully before use and follow the instructions to be sure of using the product properly The PN DR pneumatic direct acting pressure reducing valve provides a more stable secondary pressure than conventional direct acting reducing valves The PN DR is designed for a long service life and is made of stainless steel for superior durability For ...

Страница 3: ...of death or serious injury CAUTION 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 restrict the use of ...

Страница 4: ...y 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 CAUTION 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 65119MA 01 PN DR 13 Jun 2013 ...

Страница 5: ...Refer to the product nameplate for detailed specifications Serial Number Valve No Nominal Diameter Model Maximum Operating Temperature Primary Pressure Range Secondary Pressure 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 PN DR 2 PN DR 6 Primary Pressure Range 0 2 1 6 MPaG 30 230 ...

Страница 6: ...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 equipment and the pressure reducing valve 3 Installing a Control and or Safety Valve Safety Valve Steam or Air using Equipment Control Valve Pressure Reducing V...

Страница 7: ...lve 30 d or more Automatic Valve Pressure Reducing Valve 30 d or more Automatic Valve Pressure Reducing Valve Less than 30 d Automatic Valve Pressure Reducing Valve Less than 30 d Outlet secondary side of the pressure reducing valve Maintain a straight piping run of 15 d or more when a manual valve a strainer or an elbow etc is installed Example if nominal size is 25 mm 1 in have 375 mm 15 in or m...

Страница 8: ...el Ball 16 Cover Bolt 17 Holder Nut 18 Adjustment Handle 19 Nameplate 20 Retaining Ring 21 Retainer 22 Seal Ring 23 Packing 24 Slide Bearing 2 3 25 Snap Ring 2 3 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 E Repair Kit for Adjustment Handle 2 Number of parts 2 pieces 3 Shipped as a unit ...

Страница 9: ... bypass line Before installing the PN DR unit 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 Found in 3 locations ...

Страница 10: ...condensate 7 Two stage Pressure Reduction Pressure Gauge Bypass Valve Inlet Valve Outlet Valve Safety Valve Relief Valve Primary Side Pressure Reducing Valve Bypass Valve Secondary Side Inlet Valve Outlet Valve Pressure Reducing Valve Pressure Gauge Pressure Gauge Bypass Valve Inlet Valve Outlet Valve Safety Valve Relief Valve Primary Side Pressure Reducing Valve Bypass Valve Secondary Side Inlet ...

Страница 11: ...gauge and a shut off valve Ball valves which will not retain condensate are recommended for inlet outlet shut off valves The nominal pipe size for the bypass line should be 1 2 or greater of the primary pipe size 9 Motive Air Motive Air Connection Port Air Regulator for Motive Air Supply oil free air filtered to 5 µm for the motive air and adjust the air pressure to match desired value by using an...

Страница 12: ...t off valve at the inlet of the PN DR 5 Slightly open the shut off valve at the outlet of the PN DR 6 Slowly turn the adjustment handle clockwise until the desired secondary steam or air pressure is obtained with the pressure of the coil spring Wait several minutes Be careful not to make rapid adjustments as the safety valve may be activated or equipment may be damaged by water hammer Clockwise In...

Страница 13: ... ensure long service life of the PN DR the following inspection and maintenance should be performed regularly Part Inspection and Maintenance Frequency Screen Disassemble and clean annually If there is substantial blockage install a strainer approximately 60 mesh ahead of PN DR Main Valve Valve Seat If there is chattering or dirt premature wear may result Valve Stem Spacer Slide Bearing If hunting...

Страница 14: ...out only by trained maintenance personnel Remove all steam pressurized air from the piping both upstream and downstream Remove all motive air pressure Wait for the body to cool before attempting to remove the PN DR from the line Then remove the PN DR from the piping and secure it in a vise to perform the inspection Dismantling the Adjusting Section Loosen the adjustment handle completely and remov...

Страница 15: ...move it from the body The coil spring is exerting an upward pressure on the bottom of the valve seat so be careful that the valve seat is not thrown out After removing the valve seat remove the main valve the coil spring and the screen Body Screen Coil Spring Valve Seat Valve Seat Gasket Main Valve Cleaning After inspection and removal of any abnormality clean and reassemble the parts The followin...

Страница 16: ...l Spring Screen Body Packing Cover Bolt Coil Spring Bellows Cover Cover Gasket Retaining Ring Snap Ring Steel Ball Spring Guide Cover Gasket Upper Bellows Flange Spacer Slide Bearing Slide Bearing Snap Ring Valve Stem Snap Ring Cannot be removed individually as it is incorporated with the spacer and must be replaced as a set with the spacer ...

Страница 17: ...rn 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 valve is tightened it may become off centered on the valve seat If this occurs move the valve back to center Valve Seating Surface 5 Standard torque for fastening the respective screws and the width across flats of the tools to be used ar...

Страница 18: ... reviewed Problem Symptom Cause Remedy No steam air is being supplied The valve at the primary side is closed Check the primary secondary piping and valves of the unit No motive air is being supplied Check motive air supply The entrance to the screen or strainer is clogged Clean or blow down Flow rate exceeds specifications Check the flow rate check the model selection replace with a more suitable...

Страница 19: ...e check the model selection replace with a unit that has smaller nominal diameter or a more suitable unit if necessary There is too high a reduction ratio Use two stage reduction Hunting never stops The selected model is inappropriate for the service conditions specifications Check the model selection replace with a more suitable unit if necessary Condensate is entrained Install a steam trap check...

Страница 20: ...oper installation use handling etc by other than TLV CO LTD authorized service representatives 2 Malfunctions due to dirt scale rust etc 3 Malfunctions due to improper disassembly and reassembly or inadequate inspection and maintenance by other than TLV CO LTD authorized service representatives 4 Malfunctions due to disasters or forces of nature 5 Accidents or malfunctions due to any other cause b...

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