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Yoshitake GP-27 Product Manual

Pressure reducing valve
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PRESSURE REDUCING VALVE
Thank you very much for choosing the Yoshitake's product. To ensure the correct and safe use of the product,
please read this manual before use. This manual shall be kept with care for future references.
The symbols used in this manual have the following meanings.
Warning
Caution
1. Specifications···························································· 1
2. Dimensions and Weights ············································· 2
3. Operation ································································· 3
4. Nominal Size Selection method ····································· 4
MODEL GP-27
PRODUCT MANUAL
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 or may result in only property damage.
4.2 Characteristic chart ·············································· 4-5
4.3 Nominal size selection chart ·································· 6
4.4 Nominal size selection calculation formula ················ 7
5.1 Piping example ···················································· 7
5.2 Precaution for installation ······································ 7-8
6.1 Precaution for operation ········································ 9
6.2 Adjusting procedure ·············································· 9
7.1 Troubleshooting ················································· 10
7.2 Precaution for maintenance and inspection ·············· 11
7.3 Disassembly ····················································· 11
7.4 Precaution for reassembly ···································· 12
7.5 Exploded view ··················································· 13

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EPDT-393a

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Summary of Contents for Yoshitake GP-27

  • Page 1: Table Of Contents

    PRESSURE REDUCING VALVE PRODUCT MANUAL Thank you very much for choosing the Yoshitake’s product. To ensure the correct and safe use of the product, please read this manual before use. This manual shall be kept with care for future references.

  • Page 2: Specifications

    1. Specifications Model GP-27 Connection JIS 10K FF Flanged Application Steam Inlet pressure 0.1-1.0 MPa 0.03-0.8 MPa Reduced pressure 80% or less of Inlet pressure (gauge pressure) Min. differential pressure 0.07 MPa Max. pressure reducing ratio 10:1 Max. temperature 220 ℃...

  • Page 3: Dimensions And Weights

    2. Dimensions and Weights (mm) Nominal Size Weight（kg） 125A 150A 200A EPDT-393a...

  • Page 4: Operation

    3. Operation Parts name Body Spring Chamber Main valve Main valve seat Piston Cylinder Pilot valve seat Strainer Diaphragm Adjusting screw Lock nut Main valve spring Adjusting spring Pilot valve Inlet press. passage Reduced press. sensing port Diaphragm chamber The pressure-reducing valve reduces pressure by the throttling the valve. The valve is composed of the main valve and main valve seat for throttling, and adjusting spring, diaphragm, pilot valve, and piston for pressure sensing and activation.

  • Page 5: Nominal Size Selection Method

    4. Nominal size selection method 4.1 Pressure reducing valve specification selection chart Based on the selection chart, select a pressure reducing valve in the optimum manner. On the selection chart, first find the intersection point of the inlet pressure and the reduced pressure. Two-stage pressure reduction is required if the intersection point lies in range (A), or the pressures are controllable with a single pressure reducing valve if the intersection point is within range (B).
  • Page 6 (2) Pressure characteristics chart This chart shows variation in reduced pressure when the inlet pressure of 0.3 MPa is changed between 0.3 MPa and 1.0 MPa while the reduced pressure is set at 0.2 MPa. EPDT-393a...

  • Page 7: Nominal Size Selection Chart

    4.3 Nominal size selection chart [Example] When selecting the nominal size of a pressure reducing valve with its inlet pressure (P ) is 0.6 MPa, its reduced pressure (P ) 0.4 MPa and its steam flow rate 8000 kg/h, first find the intersection point (A) of inlet pressure 0.6 MPa and reduced pressure 0.4 MPa.

  • Page 8: Nominal Size Selection Calculation Formula

    4.4 Nominal size selection calculation formula An appropriate nominal size can be calculated by obtaining Cv value for the operating conditions in question, as shown below. • Calculation formula for Cv value  W: Max. steam flow rate [kg/h] : Inlet pressure [MPa･A] ...
  • Page 9 Caution 1. Do not disassemble the valve unreasonably. * Disassembling the valve at your discretion may affect the original performance. 2. Remove foreign matter and scales from the lines before connecting the valve. * Failure to follow this notice may prevent the valve from functioning correctly. * Repairs caused by foreign substances or scales will be charged even during the warranty period.

  • Page 10: Operation Procedure

    6. Operation procedure 6.1 Precaution for operation Warning 1. Do not touch the product with bare hands directly. * Failure to follow this notice may result in scalds. 2. Before applying steam to the product, confirm that there is no risk when steam flows into the piping end and that piping joints are securely connected.

  • Page 11: Troubleshooting

    7. Troubleshooting 7.1 Troubleshooting Trouble Cause Remedy 1. Working pressure is improper. 1. Correct the working pressure. Reduced pressure of 2. The strainer [12] is clogged. 2. Disassemble and clean. desired level is not 3. Foreign matter exists between 3. Disassemble and remove the foreign obtained.

  • Page 12: Precaution For Maintenance And Inspection

    7.2 Precaution for maintenance and inspection Warning 1. Completely discharge the pressure inside of the product, piping and equipment prior to disassembly and inspection. When fluid is hot, cool down the product to the condition that it can be touched with bare hands.

  • Page 13: Precaution For Reassembly

    7.5 Precautions for reassembly Caution 1. Check that there is no damage or scratch on the main valve, main valve seat, pilot valve, and pilot valve seat. When there is damage or scratch on the main valve and main valve seat, lap them. If the damage or scratch still exists even after lapping, then replace the part.

  • Page 14: Exploded View

    7.6 Exploded view Parts name Parts name Body Spring Bottom Spring Cover Top Cover Spring Spring Plug Chamber Bolt Main Valve Name Plate Main Valve Guide Pipe Seat Piston Gasket Cylinder Gasket Pilot Valve Gasket Spindle Pilot Valve Gasket Seat Strainer Pilot Valve Cap Diaphragm...

  • Page 15: Warranty Information

    ( e.g. in case of corrosion due to outdoor use). Fire, flood, earthquake, thunder and other natural disasters. Consumable parts such as O-ring, gasket, diaphragm and etc. Yoshitake is not liable for any damage or loss caused by malfunction or defect of the product. PDD-046f...

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