Yoshitake GD-27BP Manuale utente

0EPDT-278

MODEL GD-27BP

Pressure Reducing Valve

with By-pass

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 reference.

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. Usage of the Product··················································1

2. Specifications

2.1 Specifications······················································1

2.2 Nominal size selection······································ 2 - 3

2.3 Flow rate characteristics chart·································3

2.4 Pressure characteristics chart ·································4

2.5 Noise characteristics chart ·····································4

3. Dimensions and weights··············································5

4. Structure··································································6

5. Operation·································································8

6. Installation

6.1 Piping example····················································8

6.2 Precaution for installation·······································8

7. Operation procedure

7.1 Precaution for operation·······································10

7.2 Adjusting procedure············································10

8. Maintenance

8.1 Troubleshooting·················································10

8.2 Precaution for maintenance and inspection··············11

8.3 Disassembly ·····················································12

8.4 Precaution for reassembly····································14

8.5 Tool for regulation and maintenance·······················15

9. Exploded view·························································16

1EPDT-278

1. Usage of the Product

In addition to pressure reducing function, the product has by-pass function and stop function and can be used

for a wide range of pressure control in a water supply system and others for the general households,

multistoried buildings, industrial plants, and plant facilities.

2. Specifications

2.1 Specifications

Model

GD-27BP

Nominal size

20-100A

Application

Cold and hot water

Inlet pressure

1.0 MPa or less

Reduced

pressure

0.05 - 0.35 MPa

0.30 - 0.70 MPa

Min. differential pressure

0.05 MPa

Max. pressure reduction

ratio

10:1

Max. temperature

90C

Material

Body

CAC406

Valve seat

CAC406

Valve disc

FKM

Diaphragm

EPDM

Connection

JIS 10K FF flanged

Installation posture

Horizontal or vertical installation is possible

(For 100A, horizontal piping with upward posture only.

See *1 below.)

The product conforms to the standard of the Japanese Water Supply Act.

The product does not use brass material for the wetted surface area.

Pressure gauge connection port is JIS R1/4.

Pressure reducing function is set when shipped from our factory.

*1 Installation posture of 100A

Caution

Please confirm that the indications on the product correspond with the specifications

of the ordered product model before use.

* If they are different, please contact us without using the product.

Vertical piping

Horizontal piping with

sideways posture

Horizontal piping

with upward posture

2EPDT-278

2.2 Nominal size selection

Rated flow table (The pressure difference before and after the product is 0.15 MPa or more)

Nominal size

20A

25A

32A

40A

50A

65A

80A

100A

Rated flow (L/min)

100

150

250

300

450

700

Nominal size selection chart

Nominal size 20A - 50A

3EPDT-278

Nominal size selection chart

Nominal size 65A -100A

2.3 Flow rate characteristics chart

Reduced pressure

range

Offset

0.05 - 0.35MPa

0.10MPa or

below

0.30 - 0.70MPa

0.15MPa or

below

Offset

4EPDT-278

2.4 Pressure characteristics chart

This chart shows variation in the reduced pressure when the inlet pressure of 0.6 MPa is changed

between 0.15 MPa and 1.0 MPa after the reduced pressure is set at 0.1 MPa.

2.5 Noise characteristics chart (Fluid: Water)

5EPDT-278

3. Dimensions and Weights

(mm)

Size

Weight

(kg)

20A

200

137

25A

200

137

32A

245

177

40A

245

177

50A

260

186

65A

328

257

80A

402

112

274

100A

470

134

328

6EPDT-278

4. Structure

Switching of three functions (pressure reducing function, by-pass function and stop function) is conducted

by operating stems at inlet side and outlet side and pointing the arrow at a certain point of the plate. See the

next page for the arrow position and fluid flow in each function.

Caution

1. Do not switch to stop function and by-pass function for purpose other than inspection or blow.

2. The insertion port of plug [42] is for installation of pressure gauge. Do not use this port for the

purpose of airtight or pressure capacity test.

* Failure to follow this notice may result in damage to the product.

3. When installing pressure gauge to the insertion port of plug [42], pressure is not applied to pressure

gauge at outlet side while in by-pass function due to structure of the product. To check pressure

while in by-pass function, see the value shown by pressure gauge at inlet side

7EPDT-278

■Pressure reducing function

■By-pass function

■Stop function

8EPDT-278

5. Operation

Spring [35] is compressed by adjusting screw

[32] and make diaphragm [16] pushed down, and

thereby open disc [12] directly connected to it.

Fluid coming in from the inlet side flows out

from the upper part of disc [12] to the outlet side,

and passes through the reduced pressure

detection hole, and is led to the bottom of

diaphragm [16].

Load of spring [35] and the reduced pressure

act to diaphragm [16], and the upper and lower

force keeps a balance and regulates the valve

opening. As a result, diaphragm [16] keeps

reduced pressure constant.

6. Installation

6.1 Piping example

6.2 Precaution for installation

Warning

1. Since the product is heavy, securely support it using lifting devices or the like when installing. See the

product weight specified in “4. Dimensions and Weights”on Page 5.

* Failure to follow this notice may cause a falling accident of the product, resulting in an injury.

2. Connect a blow-off pipe to the outlet side of safety relief valve, and lead it to a place where there is no

risk of physical damage even if fluid blows out.

* Failure to follow this notice may result in injury and scalds in the event that high temperature fluid

blows out.

Caution

1. Do not disassemble the product unless it is necessary.

* Failure to follow this notice may prevent the product from functioning properly.

2. Before installing the product in the piping, be sure to remove foreign substances and scale from the

piping.

* Failure to follow this notice may prevent the product from achieving its intended performance due to

the ingress of foreign substances and scale into the product.

3. Be sure to install a strainer at the inlet side of the product.

* Failure to follow this notice may prevent the product from achieving its intended performance due to

the ingress of foreign substances and scale into the product. It is recommended to use a strainer of 40

mesh or more.

9EPDT-278

4. Install a safety relief valve at the outlet side of the product for protection of equipment at outlet side.

* Failure to follow this notice may result in damage of the equipment.

5. Be sure to install pressure gauges at the inlet and outlet sides of the product.

* Failure to follow this notice hampers correct pressure adjustment.

6. If a quick operating valve such as a solenoid valve is installed, place it at a distance of at least 3

meters from the product.

* Failure to follow this notice may result in malfunction or a drastically shortened service life of the

product.

7. For two-stage pressure reduction, keep a distance of at least 3 meters between each product.

* Failure to follow this notice may prevent the product from functioning properly due to malfunction.

8. Install the product properly by checking the inlet, outlet and in proper posture.

* Installing the product in wrong directions prevents the product from functioning properly.

9. Install pipes so that excessive load, torque or vibration is not applied to the product.

10. On water pressure test for inlet side piping of the product, close stop valve at inlet side of the product or

switch the product function to stop function before the test. On water pressure test for outlet side

piping of the product, switch the product function to stop function before the test.

11. Install stop valve at inlet side of the product since stop valve is necessary for strainer cleaning or

pressure control at by-pass function.

12. The product can be installed either horizontally or vertically (For 100A, horizontal installation only).

13. Secure enough space for function switching operation. For disassembly and inspection, space more

than the space indicated by H3 andH4 below is needed.

(mm)

Nominal size

20A

25A

32A

40A

50A

65A

80A

100A

160

170

190

200

210

230

260

320

330

440

460

550

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