Yoshitake GP-1000 Installation & Operation Manual Download Page 1

EPDT-081a

Model GP-1000 Series

PRESSURE REDUCING VALVE

Installation & Operation Manual

Please read this bulletin thoroughly before using the pressure reducing valve, so that you may

do so correctly and safely. Please carefully store this bulletin in a handy place.

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The following safety symbols are used in this manual. 

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Warning

Caution

Contents

1. Features

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2. Specifications

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3. Dimensions and Weights

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4. Operation

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5. Nominal Size Selection Method

5.1 Specifications selection chart

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5.2 Safety valve setting pressure

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5.3 Characteristics chart

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5.4 Nominal size selection chart

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5.5 Nominal size selection calculation formula

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6. Installation

6.1 Example of piping

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6.2 Precautions during installation

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7. Operating Procedure

7.1 Precautions during operation

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7.2 Adjustment procedures

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8. Maintenance Procedure

8.1 Troubleshooting

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8.2 Precautions during maintenance and inspection

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8.3 Disassembly

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8.4 Precautions during reassembly

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8.5 Exploded drawing

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After Sale Service

This symbol indicates a potentially hazardous situation that, if not
avoided, could result in death or serious injury.

This symbol indicates a hazardous situation that, if not avoided, may
result in minor or moderate injury. (“Caution” may also be used to
indicate other unsafe practices or risks of property damage.)

Summary of Contents for GP-1000

Page 1: ...Nominal size selection chart 5 5 5 Nominal size selection calculation formula 6 6 Installation 6 1 Example of piping 6 6 2 Precautions during installation 7 7 Operating Procedure 7 1 Precautions duri...

Page 2: ...9 1 4 MPa 0 03 0 15 MPa Reduced pressure 90 or less of inlet pressure gauge pressure Min differential pressure 0 05 MPa Max pressure reducing ratio 20 1 Max temperature 220 Valve seat leakage 0 01 or...

Page 3: ...67 10 0 32A 190 323 82 14 0 40A 190 323 82 14 5 50A 220 347 93 20 0 65A 245 357 100 30 0 80A 290 404 122 35 0 100A 330 450 144 52 5 GP 1010 1012 Size d Weight kg 15A Rc 1 2 150 285 64 7 0 20A Rc 3 4...

Page 4: ...in Inlet pressure is applied to the downside of the main valve High pressure fluid passes through strainer 28 via inlet pressure passage 42 to also apply inlet pressure to the downside of the pilot va...

Page 5: ...0 4 Reduced pressures more than 0 08 0 4 0 6 Reduced pressures more than 0 1 0 6 0 8 Reduced pressures more than 0 12 0 8 1 4 Reduced pressures 15 5 3 Characteristics chart 1 Flow rate characteristic...

Page 6: ...nominal sizes 40A and 50A Select the larger nominal size 50A Ex 2 For example take a pressure reducing valve whose inlet pressure P1 is 0 8 MPa reduced pressure P2 is 0 05 MPa flow rate 600 kg h First...

Page 7: ...nd the pressure reducing is 0 4 MPa or less find the appropriate correction coefficient C using chart below and multiply the rated Cv value and obtain the corrected Cv value Ex Take a pressure reducin...

Page 8: ...e valve Failure to do so may hamper correct pressure adjustment 6 Install a steam trap to the inlet sides of the valve to prevent drainage problems Failure to do so may result in drainage problem affe...

Page 9: ...ushing down At this time do not turn with too much torque or do not turn excessively Rust generated in the valves and lines may cause malfunction 7 2 Adjustment procedures Follow the steps below and s...

Page 10: ...hragm 5 is damaged 1 Disassemble and remove the foreign matter When any scratches are identified lap the main valve and main valve seat Change the parts if scratches still exist after lapping 2 Disass...

Page 11: ...g water hammer etc resulting in damage to the valve and other equipment 6 Remove condensate completely from the line and close the stop valves before and after the valve when not using it for long per...

Page 12: ...valve and pilot valve seat change into pilot valve assembly 2 Move the sliding section pilot valve piston etc two to three times and confirm they move smoothly If the sliding parts do not move correc...

Page 13: ...alve assembly 5 years 24 Gasket 5 years 26 27 Gasket 2 years 28 Strainer 5 years 30 Gasket 2 years Note Apply a liquid sealant for heat and steam resistant Recommendation NEVER SEEZ Standard grade to...

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