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Yoshitake GDK-2000 Скачать руководство пользователя страница 1

EPDT-021a

MODEL GDK-2000

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.
The symbols used in this manual have the following meanings.

Warning

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

Caution

This symbol indicates a hazardous situation that, if not avoided, may result
in minor or moderate injury or may result in only property damage.

Table of Contents

1. Specifications··························································· 1-2
2. Dimensions and Weights ············································· 2
3. Operation ································································ 3-5

4. Nominal Size Selection

method

4.1 Pressure reducing valve specification selection chart ··· 6
4.2 Safety valve setting pressure chart ··························· 6
4.3 Characteristic chart ············································· 7
4.4 Nominal size selection chart ·································· 8
4.5 Nominal size selection calculation formula ················· 9

5. Installation

5.1 Precaution for installation ····································· 10
5.2 Installing accessories ·········································· 10
5.3 Piping before and after the pressure reducing valve ··· 11
5.4 Piping example ·················································· 12

6. Operation procedure

6.1

Precaution for operation ······································ 13

6.2 Adjusting procedure ············································ 13

7. Maintenance Procedure

7.1 Troubleshooting ················································· 14
7.2 Precaution for maintenance and inspection ·············· 15
7.3 Disassembly ····················································· 15
7.4 Precaution for reassembly ···································· 15
7.5 Exploded drawing ·············································· 16

Warranty Information

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Содержание GDK-2000

Страница 1: ...y property damage Table of Contents 1 Specifications 1 2 2 Dimensions and Weights 2 3 Operation 3 5 4 Nominal Size Selection method 4 1 Pressure reducing valve specification selection chart 6 4 2 Safe...

Страница 2: ...l Main diaphragm Stainless Steel Refer to Standard Loading Pressure Setting Pressure Chart Lines for system air pressure Caution Please confirm that the indications on the product correspond with the...

Страница 3: ...alculated as follows Loading pressure P P P2 0 037 0 2 0 237MPa 2 Dimensions and Weights The structure differs for nominal sizes 65A to 100A mm Nominal size Screwed JIS Rc Flanged JIS 20K RF d L H1 H...

Страница 4: ...valve seat 11 Main diaphragm 12 Main valve spring 31 Main diaphragm chamber 32 Reduced pressure sensing port 33 Air pressure control space 1 When the pressure reducing valve is mounted correctly the m...

Страница 5: ...in valve open The fluid then begins to flow from the inlet side to the reduced pressure side Fig 2 3 The flow of pressure proceeds from the reduced pressure sensing pipe through the reduced pressure s...

Страница 6: ...5 EPDT 021a Fig 4 Air pressure 4 In the absence of a reduced pressure load the pressure in the diaphragm chamber increases thereby pushing the main valve spring to close the valve Fig 4...

Страница 7: ...age pressure reduction is required In this case maximize the distance between the valves at least 3 meters The valve does not fulfill specified performance in the range C 4 2 Safety valve setting pres...

Страница 8: ...se 0 02 MPa or less Offset 10 or less of set pressure at outlet side Minimum value 0 05MPa 2 Pressure characteristics chart This chart shows variation in reduced pressure when the inlet pressure of 1...

Страница 9: ...ced pressure P2 is 0 4 MPa and its steam flow rate is 600 kg h first find the intersection point a of inlet pressure 0 6 MPa and reduced pressure 0 4 MPa Trace down vertically from this intersection p...

Страница 10: ...under the following conditions Nominal size 15A saturated steam Inlet pressure of 0 6 MPa 0 7 MPa A Reduced pressure of 0 4 MPa 0 5 MPa A you can find that Cv value of 15A is 5 0 from the chart The f...

Страница 11: ...ent the valve from functioning 5 Do not connect the sensing pipe close to valves and elbows Choose the position with the least vibration Recommended straight length 10 times the line pipe diameter Fai...

Страница 12: ...nstall a pressure gauge at both the inlet and outlet sides of the valve Failure to do so may hamper correct pressure adjustment 4 Install a steam trap to the inlet sides of the valve to prevent draina...

Страница 13: ...is long the operating pressure set pressure basic diagram will deviate slightly In such cases change the operating pressure to achieve the required set pressure Standard operating circuit The standar...

Страница 14: ...a wrong adjusting procedure may cause hunting scale problems or water hammer and can heavily damage the main parts of the valve Be sure to follow the procedure below see also 5 4 Piping example 1 Con...

Страница 15: ...ist please contact us 3 Incorrect pressure adjustment 3 Set correctly refer to 6 2 Adjusting procedure 4 Foreign substances stuck between the spindle 8 and the guide 9 4 Disassemble the product and re...

Страница 16: ...se malfunction due to rusting inside of the product and the pipes 5 After stopping operation of the product for an extended period conduct operational check of the product In the event of product fail...

Страница 17: ...for nominal sizes 65A to 100A The parts name shown in the rectangle boxes are available as consumable supply Apply lubricant agent for heat steam resistance recommendation SOLVEST No 110 paste STT In...

Страница 18: ...improvement without any prior notice After the discontinuation of the product Yoshitake supplies the repair parts for 5 years otherwise individually agreed 3 This warranty does not cover the damage d...

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