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172-65260m-05 (S-COS/S-COSR Pressure Reducing Valve) 27 Oct 2008

Disassembling the Main Valve (S-COSR Only)

Turn the S-COSR

upside down for easy dismantling of the main valve. Loosen and

remove the cover plug. Removal of the cover plug and pressed-in sleeve permits the
removal of the main valve, main valve spring and the screen. Loosen the main valve
seat by using a box wrench and remove from the main body.

Check for damage on the seating and sliding surfaces of the main valve seat and the
seating surface of the valve seat, and for damage on the gaskets.

At start-up following shut-down for a long period, always blow down the piston
section of the body through the plug (if optional plug is supplied).

Cleaning

After inspection and removal of any abnormality, clean and reassemble the parts.
The following parts will require cleaning before reassembly:

S-COS

S-COSR

Trap Cover

Adjustment Screw

Cover Plug

Adjustment Screw

Pilot Valve

Pilot Valve Seat

Pilot Valve

Pilot Valve Seat

Main Valve

Main Valve Seat

Main Valve

Main Valve Seat

Pilot Screen

Pilot Screen Holder

Pilot Screen

Pilot Screen Holder

Piston Separator

Screen

Piston Screen

Piston Ring

Cylinder

Piston Ring

Cylinder

Float

Trap Valve Seat

It is permissible to clean using water; however cleaning with a mild detergent is
recommended for more effective cleaning.

(Coat threaded position with anti-seize after cleaning.)

Screen

Sleeve

Cover

Plug

Cover Plug

Gasket

Main Body

Main Valve Seat
& Gasket

Main Valve

Main Valve Spring

Содержание S-COS-16

Страница 1: ...ressure Reducing Valve 27 October 2008 Pressure Reducing Valve for Steam S COS 16 S COSR 16 Copyright 2008 by TLV CO LTD All rights reserved ISO 9001 ISO 14001 Manufacturer Kakogawa Japan is approved by LRQA LTD to ISO 9001 14001 ...

Страница 2: ...ng used is very dry Using steam in which matter such as condensate scale types of grease or air is entrained can result not only in problems with the steam using equipment and in lowered productivity but can also lead to shortened service life for and malfunction of the pressure reducing valves The S COS with a built in separator and steam trap eliminates these problems and makes possible the supp...

Страница 3: ...tial threat of death or serious injury CAUTION Indicates that there is a possibility of injury or equipment product damage WARNING NEVER apply direct heat to the float The float may explode due to increased internal pressure causing accidents leading to serious injury or damage to property and equipment CAUTION Install properly and DO NOT use this product outside the recommended operating pressure...

Страница 4: ...discharge of fluids Do not use excessive force when connecting threaded pipes to 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 Use only under conditions in which no water hammer ...

Страница 5: ... freeze up will occur Freezing may damage the product leading to fluid discharge which may cause burns or other injury CAUTION 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 S COS 16 S COSR 16 Primary Pressure Range 0 2 1 6 MPaG Within 10 84...

Страница 6: ...e adjustment is impossible chattering occurs momentarily To save energy install the on off valve as near to the boiler as possible NOTE To prevent water hammer it is recommended that a slow acting motorized on off valve be used In particular if a fast acting on off solenoid valve is used for frequent temperature control the potential water hammer effect can damage the steam equipment and the press...

Страница 7: ...nal size is 25 mm have 750 mm or more 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 have 375 mm or more Maintain a straight piping run of 30 d or more when a safety valve is installed Example if nominal size is 25 mm have 750 mm or more Maintain a strai...

Страница 8: ...tor 5 Float 6 Float Cover 7 Trap Valve Seat 8 Separator Screen 9 Main Valve Seat 10 Main Valve 11 Piston 12 Cylinder 13 Pilot Screen 14 Pilot Screen Holder 15 Pilot Valve Body 16 Pilot Valve Stem 17 Pilot Valve Seat 18 Diaphragm 19 Diaphragm Support 20 Spring Housing 21 Coil Spring 22 Adjustment Screw 23 Adjustment Handle 24 Plug Plug option ...

Страница 9: ...dy 2 Cover Plug 3 Screen 4 Main Valve Seat 5 Main Valve 6 Piston 7 Cylinder 8 Pilot Body 9 Pilot Valve Stem 10 Pilot Valve Seat 11 Diaphragm 12 Pilot Screen 13 Pilot Screen Holder 14 Diaphragm Support 15 Coil Spring 16 Spring Housing 17 Adjustment Screw 18 Adjustment Handle 19 Plug Plug option ...

Страница 10: ...alling the pressure reducing valve 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 Seal and Cap Before installation be sure to remove all protective seals and caps from the product inlet and outlet s Fou...

Страница 11: ...equipment is used only periodically such as for room heating equipment be sure to use a blowdown valve 1 Remove the plug from the main body 2 Install the blowdown valve 3 Open the blowdown valve and blow any residual dirt and scale off of the screen 4 Periodically activate the blowdown valve to keep the system free of dirt and scale 8 Piping Size If it is expected that the secondary steam flow vel...

Страница 12: ...recommended for inlet and outlet shut off valves The bypass pipe should be at least one half the size of the inlet primary side pipe A strainer should always be installed ahead of the S COSR S COS has a built in strainer however in case an external strainer is installed it should be installed ahead of COSPECT and the strainer should be installed horizontally with the basket at the 3 or 9 o clock p...

Страница 13: ...ve are completely closed 3 Loosen the locknut and turn the adjustment screw counterclockwise to reduce tension on the coil spring 4 Slowly fully open the shut off valve at the inlet of the pressure reducing valve Allow sufficient time for condensate remaining at the inlet of the pressure reducing valve to be discharged 5 Slightly open the shut off valve at the outlet of the pressure reducing valve...

Страница 14: ...Inspection and Maintenance Frequency Main Screen Pilot Screen Disassemble and clean annually If there is substantial blockage install a strainer approximately 60 mesh ahead of the pressure reducing valve Main Valve Main Valve Seat Pilot Valve Pilot Valve Seat Replace after approximately 15 000 hours If there is chattering or dirt premature wear may result Piston Ring Replace after approximately 8 ...

Страница 15: ...ion inspection maintenance repairs disassembly adjustment and valve opening closing should be carried out only by trained maintenance personnel Remove all steam from the piping both upstream and downstream If the steam supply to the system cannot be shut off change over to bypass operation Close shut off valves at the inlet and outlet of the pressure reducing valve completely Relieve residual stea...

Страница 16: ...ing the Piston Remove the pilot body after loosening and removing the nuts from the stud bolts During this process pay attention not to lose the connecting tubes 2 Remove the piston and the cylinder from the main body Then remove the piston rings and the tension rings from the piston Do not apply too much force when removing the piston rings and tension rings Inspect the interior of the cylinder t...

Страница 17: ...n valve seat and the gaskets and for clogging of the screen At start up following shut down for a long period always blow down the piston section of the main body through the plug if optional plug is supplied Disassembling the Steam Trap S COS Only Loosen the bolts and remove the trap cover Be careful as hot condensate may splash out Remove the bolt from the float cover to reveal the float Remove ...

Страница 18: ...on of the body through the plug if optional plug is supplied Cleaning After inspection and removal of any abnormality clean and reassemble the parts The following parts will require cleaning before reassembly S COS S COSR Trap Cover Adjustment Screw Cover Plug Adjustment Screw Pilot Valve Pilot Valve Seat Pilot Valve Pilot Valve Seat Main Valve Main Valve Seat Main Valve Main Valve Seat Pilot Scre...

Страница 19: ...172 65260m 05 S COS S COSR Pressure Reducing Valve 27 Oct 2008 19 Exploded View S COS S COSR Adjustment Section Pilot Section Piston Section Separator Main Valve Section Steam Trap Section ...

Страница 20: ...de operate smoothly without binding 1 Fit the piston ring to the outside of the tension ring 2 The ring gaps should be opposite each other 5 Standard fastening torque and the width across flats for the tools to be used are as follows Part Tightening Torque N m Distance Across Flats mm Bolt for Spring Housing Pilot Body 25 13 Pilot Valve Seat 50 17 Pilot Screen Holder 40 24 Nut Bolt for Pilot Body ...

Страница 21: ...echanical noise 5 Steam leaks from the steam trap or condensate is not discharged S COS only 6 Abnormal noises Major causes for the above problems are usage under non specified conditions out of specification insufficient pressure or flow rate and clogs by dirt and scale To ensure performance for a long period of time it is recommended that the Correct Usage of S COS S COSR Pressure Reducing Valve...

Страница 22: ...ressure There is a build up of dirt on or damage to the pilot valve or main valve seating surfaces Clean Align Replace if necessary Occurs at low steam demand It is being operated below the lower flow rate limit Check the volume of steam supply replace with a smaller diameter valve There is too high a reduction ratio operated at below 10 of the primary pressure Use a two stage reduction arrangemen...

Страница 23: ...at is deformed Check for water hammer Replace with a new float Steam is blowing There is vibration in the piping Secure the piping The primary pressure exceeds the trap valve seat maximum working pressure Adjust primary pressure Water is inside the float Replace with a new float The outlet piping is clogged Check the piping Clean Faulty steam trap S COS only No condensate is discharged The trap va...

Страница 24: ...ons due to improper 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 an...

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