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172-65613A-03 (DR8-3P/DR8-3EP/DR8-6P/DR8-6EP) 11 Jun 2020

4. Precautions for the installation of additional fittings before or after the DR8

In order to ensure a stable steam flow, the piping upstream and downstream
of the DR8

must be in straight runs. If the DR8 is installed either directly

before or after an elbow or control valve, unevenness in steam flow may result
in chattering and unstable pressure.
To ensure a stable steam flow, it is recommended that the DR8

be installed on

straight runs of piping, as illustrated below.

①

Inlet (primary side) of the pressure reducing valve

(NOTE: d = pipe diameter)

Maintain a straight piping
run of

10 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 250 mm
(10 in) or more)

Valve, Strainer,

Elbow, etc.

10 d or more

DR8

Valve, Strainer,

Elbow, etc.

10 d or more

DR8

Steam
Trap

Less than

10 d

Valve, Strainer,

Elbow, etc.

DR8

Less than

10 d

Valve, Strainer,

Elbow, etc.

DR8

Steam
Trap

Maintain a straight piping
run of

30 d or more

when

an automatic valve (on-off
valve) is installed.

(Example: if nominal size is
25 mm (1 in), have 750
mm (30 in) or more)

30 d or more

DR8

Automatic

Valve

30 d or more

DR8

Automatic

Valve

Steam
Trap

Less than

30 d

DR8

Automatic

Valve

Less than

30 d

DR8

Automatic

Valve

Steam
Trap

②

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 more)

15 d or more

DR8

Valve, Strainer,

Elbow, etc.

15 d or more

DR8

Valve, Strainer,

Elbow, etc.

Steam

Trap

Less than

15 d

DR8

Valve, Strainer,

Elbow, etc.

Less than

15 d

DR8

Valve, Strainer,

Elbow, etc.

Steam

Trap

Maintain a straight piping
run of

30 d or more

when

a safety valve is installed.

(Example: if nominal size is
25 mm (1 in), have 750
mm (30 in) or more)

30 d or more

DR8

Safety

(Relief)

Valve

30 d or more

DR8

Safety

(Relief)

Valve

Steam
Trap

Less than

30 d

DR8

Safety

(Relief)

Valve

Less than

30 d

DR8

Safety

(Relief)

Valve

Steam
Trap

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)

30 d or more

DR8

Second

Pressure

Reducing

Valve

Steam
Trap

Less than

30 d

DR8

Steam
Trap

Second

Pressure

Reducing

Valve

Содержание DR8-3EP

Страница 1: ...1 June 2020 Manufacturer 881 Nagasuna Noguchi Kakogawa Hyogo 675 8511 Japan Tel 81 0 79 422 1122 Fax 81 0 79 422 0112 Copyright 2020 by TLV CO LTD All rights reserved Clean Steam Direct acting Pressure Reducing Valve DR8 3P DR8 3EP DR8 6P DR8 6EP ...

Страница 2: ...ow the instructions to be sure of using the product properly The TLV DR8 clean steam direct acting pressure reducing valve has been developed especially for the food beverage and pharmaceutical industries This product has an angle type structure with special polishing applied to internal parts to minimize areas for condensate to accumulate and prevent contamination inside the product Additionally ...

Страница 3: ...s Symbols Indicates a DANGER WARNING or CAUTION item DANGER Indicates an urgent situation which poses a threat of death or serious injury WARNING Indicates that there is a potential threat of death or serious injury CAUTION Indicates that there is a possibility of injury or equipment product damage CAUTION Install properly and DO NOT use this product outside the recommended operating pressure temp...

Страница 4: ...esult in damage to the product and burns or other injury due to malfunction or the discharge of fluids 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 wh...

Страница 5: ...housing for detailed specifications Connection Standard No CNo Production Lot No Inner Diameter Primary Pressure Range Secondary Pressure Adjustable Range Connection Standard Nominal Diameter Maximum Allowable Pressure Temperature Maximum Operating Pressure Temperature Model Maximum allowable pressure PMA and maximum allowable temperature TMA are PRESSURE SHELL DESIGN CONDITIONS NOT OPERATING COND...

Страница 6: ...justment is impossible chattering occurs momentarily To save energy it is recommended to 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 using ...

Страница 7: ...mple if nominal size is 25 mm 1 in have 750 mm 30 in or more 30 d or more DR8 Automatic Valve 30 d or more DR8 Automatic Valve Steam Trap Less than 30 d DR8 Automatic Valve Less than 30 d DR8 Automatic Valve Steam Trap 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 si...

Страница 8: ... Clamp Nut 4 24 Spring Washer 4 25 Inlet Clamp 4 26 Inlet Clamp Bolt 5 27 Inlet Clamp Nut 5 28 Spring Washer 5 29 Adapter 6 30 Coil Spring Guide 1 Replacement parts are available only in the following kits A Maintenance Kit B Repair Kit for Diaphragm Valve C Repair Kit for Valve Guide 2 The spring retainer and coil spring guide cannot be removed individually as they are incorporated with the coil ...

Страница 9: ...e carried out only by trained maintenance personnel 1 Removing the Protective Caps Before installation be sure to remove all protective seals and caps covering the product inlet and outlets Found in 2 locations 2 Tolerance Angle for Installation Make sure the DR8 is installed vertically so that the arrow mark on the body matches the direction of steam flow the outlet is horizontal and the adjustme...

Страница 10: ...ve Outlet Valve Pressure Gauge Steam Trap Bypass Valve Secondary Side Safety Valve Relief Valve Outlet Valve Pressure Gauge Primary Side Pressure Gauge Inlet Valve Steam Trap 6 Two stage Pressure Reduction Employ 2 stage pressure reduction if the required reduction is not possible due to DR8 operating range limitations when it is not possible to reduce to the desired pressure using a single pressu...

Страница 11: ... Installing the bypass valve makes blowdown easier Blowdown is especially important for newly installed piping or after the system has been shut down for a long period of time This will reduce operation failure caused by condensate or foreign matter The bypass valve should not be opened too quickly If a safety valve or relief valve is installed perform blowdown staying clear of pressurized blow ou...

Страница 12: ...pressurized blow out from the safety valve 2 Make sure that the shut off and bypass valves located upstream and downstream of the DR8 are completely closed 3 Remove the cap and loosen the locknut then turn the adjustment screw counterclockwise to free the coil spring 4 Slowly fully open the shut off valve at the inlet of the DR8 5 Slightly open the shut off valve at the outlet of the DR8 6 Turn th...

Страница 13: ...ons may result in damage to the product or burns or other injury due to malfunction or the discharge of fluids CAUTION Parts Inspection When parts have been removed or during periodic inspections use the following table to inspect the parts and replace any that are found to be defective Part Inspection and Maintenance Frequency Diaphragm Protective Sheet If hunting or chattering takes place cracks...

Страница 14: ...is especially important to perform an inspection immediately after the initial run of a new line or before or after equipment such as a heater is 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 steam from the piping both upstream and downstrea...

Страница 15: ...OTE The spring retainer and coil spring guide cannot be removed individually as they are incorporated with the coil spring Disassembling the Diaphragm Section Hold the valve in place with an adjustable wrench across the flats on the upper part of the valve and use another wrench to remove the high nut After removing the high nut remove the plain washer the upper diaphragm retainer and the diaphrag...

Страница 16: ...e inlet clamp s holding the body valve guide and adapter for sizes 15 to 20 mm 1 2 to 3 4 in only Remove the adapter and the inlet clamp gasket for sizes 15 to 20 mm 1 2 to 3 4 in only Separate the valve guide from the body The valve comes off with the valve guide Valve Inlet Clamp Gasket Valve Guide ...

Страница 17: ...dy and valve cracks or deterioration of the diaphragm and protective sheet wear on the valve guide cracks or deterioration of the retainer gasket and if there are no abnormalities clean and reassemble the parts The following parts will require cleaning before reassembly Diaphragm protective sheet valve valve guide retainer gasket body lower diaphragm retainer adapter for sizes 15 to 20 mm 1 2 to 3...

Страница 18: ...e spring retainer and coil spring guide cannot be removed individually as they are incorporated with the coil spring 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 ...

Страница 19: ...If no abnormalities are found these parts can be reused When there are scratches or erosion on these parts the body and or valve need to be replaced Viewing the valve seat section of the body from the inlet side Valve Seating surface 3 The retainer gasket may be re used if it has no cracks or deterioration If any abnormalities are found it needs to be replaced 4 Applying anti seize to all non wett...

Страница 20: ...ed that the Acceptable Operating Range Correct Usage of the DR8 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 steam is being supplied Check the primary secondary piping and valves of the unit The valve at the primary side is closed The filter at the primary side is clogged Cl...

Страница 21: ... low Check the flow rate check the model selection replace with a more suitable unit if necessary Hunting never stops The reduction ratio is too high 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 Condensate is entrained Install a separator or a ste...

Страница 22: ...ith the Specifications or 10 failure to follow the instructions contained in the TLV Instruction Manual for the Product Duration Of Warranty This warranty is effective for a period of the earlier of i three 3 years after delivery of Products to the first end user in the case of sealed SST Series Products for use in steam pressure service up to 650 psig ii two 2 years after delivery of Products to ...

Страница 23: ...CIAL 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 HEREBY INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE CANNOT BE EXCLUDED SUCH DAMAGES ARE EXPRESSLY LIMITED IN AMOUNT TO THE PURCHASE PRICE OF THE DEFECTIVE PRODUCT ...

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