Yoshitake GP-1200 Manuel utilisateur

■EPDT-101■

Model GP-1200&GP-1210

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.

―――――――――The following safety symbols are used in this manual. ――――――――





Warning





Caution

Contents

1. Features･････････････････････････････････････････････････････ 1

2. Specifications････････････････････････････････････････････････ 1

3. Dimensions and Weights･････････････････････････････････････ 2

4. Operation････････････････････････････････････････････････････ 3

5. Nominal Size Selection Method

5.1 Standard loading pressure -setting pressure

chartline･････････････････････････････ 3

5.2 Specifications selection chart ･････････････････････････････ 4

5.3 Safety valve setting pressure chart ･･･････････････････････ 4

5.4 Characteristics chart･･････････････････････････････････････ 4

5.5 Nominal size selection chart ･･････････････････････････････ 5

5.6 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 during operation ･････････････････････････････ 8

7.2 Adjustment procedures･･･････････････････････････････････ 8

8. Maintenance Procedure

8.1 Troubleshooting ･･････････････････････････････････････････ 9

8.2 Precautions during maintenance and inspection ･････････ 10

8.3 Disassembly･････････････････････････････････････････････ 10

8.4 Precautions during reassembly ･･････････････････････････ 11

8.5 Exploded drawing ･･･････････････････････････････････････ 12

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.)

■EPDT-101■

‑1‑

1. Features

GP-1000 Series pressure reducing valves for steam are pilot-operated valves which can be used with

confidence for small to large flow rate, in a host of applications ranging from building utilities systems,

air-conditioning systems, and factory systems, etc.GP-1200 and 1210 models can be used as pneumatic,

remote type valves, making them well suited for systems where the pressure setting is frequently

changed, or for centralized control system.

2. Specifications

Model GP-1200 GP-1210

Connection Flanged (JIS 10K FF) JIS Rc Screw

Nominal size 15～100A 15～50A

Application Steam

Inlet pressure 0.1～1.0 MPa

0.05～0.9 MPa

Reduced pressure 90% or less of inlet pressure (gauge pressure)

Loading air pressure See the “Standard loading pressure-setting pressure chart line”. (P.3)

Min. differential pressure 0.05 MPa

Max. pressure reducing ratio 20：1

Max. temperature 220℃

Valve seat leakage 0.01% or less of rated flow

Body Ductile cast iron

Valve Stainless steel

Valve seat Stainless steel

Piston/Cylinder Brass or Bronze

Material

Gasket Non asbestos

Body hydraulic test 2.0 MPa

lStainless steel main components (piston & cylinder) are also available. (GP-1200S,1210S)

lStainless steel type is also available for GP-1200 [15-50A]. (GP-1200SS: Wetted parts stainless steel)

Caution

(1) Please collate with attached nameplate and specification of ordered model.

※Please consult factory in case they do not match each other.

■EPDT-101■

‑2‑

Rc1/4 Air loading

pressure port

Rc1/4 Air loading

pressure port

3. Dimensions and Weights

•ＧＰ－1200

(㎜)

Size ＬＨＨ

１Weight（kg）

15A 150 220 64 8.0

20A 155 220 64 8.5

25A 160 235 67 10.0

32A 190 258 82 14.0

40A 190 258 82 14.5

50A 220 282 93 20.0

65A 245 292 100 30.0

80A 290 339 122 35.0

100A 330 385 144 52.5

•ＧＰ－1210

(㎜)

Size d ＬＨＨ

１Weight（kg）

15A Rc 1/2 150 220 64 7.0

20A Rc 3/4 155 220 64 7.0

25A Rc 1 160 235 67 8.5

32A Rc 1-1/4 190 258 82 12.0

40A Rc 1-1/2 190 258 82 12.5

50A Rc 2 220 282 93 18.0

■EPDT-101■

‑3‑

Rc1/4 Air loading

pressure port

4. Operation

No. Parts name

1 Body

8 Pilot diaphragm

9 Main valve

11 Main valve seat

12 Piston

13 Cylinder

17 Pilot valve

18 Pilot valve seat

26 Strainer

41 Inlet press. passage

42 Reduced press. Sensing port

43 Diaphragm chamber

44 Air 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 air pressure control space, diaphragm, pilot valve, and

piston for pressure sensing and activation.

(1) When the pressure reducing valve is mounted correctly, main valve [9] and pilot valve [17] should

be closed when air pressure is no-pressure because of spring force. Slowly open the gate valve and

allow the high pressure fluid to flow in. Inlet pressure is applied to the downside of the main valve.

High pressure fluid passes through strainer [26] via inlet pressure passage [41] to also apply inlet

pressure to the downside of the pilot valve.

(2) Introducing air pressure into air chamber [44] flexes pilot diaphragm [8] to open the pilot valve.

(3) Inlet pressure via inlet pressure passage and pilot valve enters the upside of the piston. The pressure

overrides the pressure on the downside of the main valve and the load of main valve spring, to open

the main valve. The fluid then begins to flow from the inlet side.

(4) Reduced pressure is led to diaphragm chamber [43] via reduced pressure sensing port [42]. The

diaphragm receives the reduced pressure to be balanced with the air loading pressure, and control

the pilot valve travel.

(5) The change of pilot valve travel changes the flow rate of fluid to the upside of the piston, and

controls the main valve travel to obtain appropriate reduced pressure.

5. Nominal Size Selection Method

5.1 Standard loading pressure-setting pressure chart line

The setting pressures corresponding

to the loading pressure are shown left.

(P1: 1.0 MPa) As slight deviations

from the loading pressure-setting

pressure chart line shown left may

occur depending on conditions, such

as the length of the air line, etc., a

setting pressure which is high enough

to cover such deviations should be

selected.

SettingpressureMPa

LoadingpressureMPa

0.8

0.6

0.4

0.2

01.00.80.60.40.2

■EPDT-101■

‑4‑

5.2 Pressure reducing valve specification selection chart

Find the intersection point of the

inlet and reduced pressures. The

GP-1200 (1210) valves are suitable

within range (A). When within

range (B), maximum performance

cannot be obtained.

5.2 Safety valve setting pressure chart

Determine the reduced pressure of

pressure reducing valve. Find the

intersection point (A) with the chart

curve. Next, find point (B) by

proceeds horizontally from point (A)

to the left until the ‘Setting pressure

of safety valve’ axis. The setting

pressure of the safety valve should

be higher than the pressure of the

point (B).

5.3 Characteristics chart

(1) Flow rate characteristics chart

•Shut-off pressure raise : 0.02 MPa or less

•Offset : 0.03 MPa or less

(Setting pressure: 0.05~0.1 MPa)

: 0.05 MPa or less

(Setting pressure: 0.1~0.9 MPa)

(2) Pressure characteristics chart

Reduced pressure is set to 0.1 MPa

when inlet pressure is 1.0 MPa. The

chart indicates a variation in reduced

pressure when the inlet pressure is

changed from 1.0 to 0.3 MPa.

ReducedpressureMPa

0.80.60.40.2

1.6

1.2

0.8

0.4 BA

Settingpressureof

safetyvalve

MPa

10050

Offset

Shut‑offpressureraise

5Flowrate

Setting

pressure

(%)0

Reduced

pressure

Min.adjustableflowrate Ratedflow

0.8

0.08

InletpressureMPa

1.0

0.60.40.2

0.16

0.14

0.12

0.10

ReducedpressureMPa

0.1 0.8 0.9

0.70.60.50.40.30.2

0.6

1.0

0.8

0.4

0.2

InletpressureMPa

ReducedpressureMPa

Controllablerange(A)

Maximumperformance

isimpossiblewithin

thisrange(B)

■EPDT-101■

‑5‑

5.4 Nominal size selection chart

[Ex.1]

For example, take a pressure reducing valve whose inlet pressure (P1) is 0.6 MPa, reduced pressure (P2)

is 0.4 MPa, flow rate 800 kg/h. First, find the point of intersection (A) of inlet pressure 0.6 MPa and

reduced pressure 0.4 MPa. Vertically proceed from point (A) to come across the flow rate 800 kg/h,

and regard this point as (B). Point (B) is between 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, find the point of intersection (C) of inlet pressure 0.8 MPa and

the diagonal line. Move leftward down the diagonal line to intersection point (D) where the diagonals

line intersect with the reduced pressure 0.05 MPa. Vertically proceed from point (D) to come across

the flow rate 600 kg/h, and regard this point as (E). Point (E) is between nominal sizes 32A and 40A.

Select the larger nominal size 40A.

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0

(E)

(D)

(B)

(A)

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

200

10000

8000

10000

8000

10

100A

80A

65A

W:Flowratekg/h

:InletpressureMPa

：ReducedpressureMPa

300

20

800

600

400

Nominal

size

50A

40A

32A

25A

20A

15A

(C)

600

800

1000

2000

3000

4000

6000

6000

4000

3000

2000

1000

400

300

200

100

80

60

40

30

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0

：ReducedpressureMPa

W:Flowratekg/h

■EPDT-101■

‑6‑

5.5 Nominal size selection calculation formula

The appropriate nominal size can be calculated by obtaining the Cv value for the operating conditions

in question, as shown below.

•Cv value calculation formula

•Rated Cv value table (When Cv correction coefficient is C=1)

Nominal size 15A 20A 25A 32A 40A 50A 65A 80A 100A

Rated Cv value 1 2.3 4 6.5 9 16 25 36 64

※Correction of rated Cv value

If the inlet pressure exceeds 0.7 MPa, and the pressure reducing ratio exceeds 10:1,

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 reducing valve whose inlet

pressure is 0.8 MPa, reduced pressure is 0.05

MPa. Find the inlet and reduced pressure

intersection point (A) at the left chart, then

draw a horizontal line in the leftward

direction to point (B) which indicates a

correction coefficient of 0.85. For a nominal

size of 25A, the corrected Cv value would be

calculated as follows:

4(rated Cv value) ×0.85(correction

coefficient) = 3.4

6. Installation

6.1 Example of piping

W: Max. steam flow rate [kg/h]

P1: Inlet pressure [MPa･A]

P2: Reduced pressure [MPa･A]

ΔP: P1−P2 [MPa]

k: 1+0.0013 ×{super-heated steam

temp.[℃]−saturated steam

temp.[℃]}

)PP(P138

Cv 21 +∆

1120P

Cv =

Air pressure

Non-return

valve

Standard unit

3 port

solenoid valve

Stop

valve GP-1200

Pressure reducing valve

Safety

valve

Reducer

Blow

1810

Trap

Sight glass

By-pass

stop valve

Strainer

Drain separator

DS-1

Pressure

gauge Pressure

gauge

Stop

valve

Stop

valve

Stop

valve

Relief

pipe

P:ReducedpressureMPa

0.100.080.060.040.02

(B) (A)

1.0

0.9

0.8

0.7

0.9

0.8

C:Correction

coefficient

:InletpressureMPa

0.7

1.0

■EPDT-101■

‑7‑

6.2 Precautions during installation

Warning

(1) Because of heavy weight, hold the valve with lifting equipment while piping. Refer to

“3. Dimensions and Weights” table for the valve weight.

※Failure to do so may result in injury due to dropping the valve.

(2) In case installing safety valve as safety device at outlet side, joint relief pipe at outlet

of safety valve and guide it to safety place where steam can relief out.

※Failure to do so may result in burns.

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 do so may prevent the valve from functioning correctly.

(3) Install a strainer (Recommendation: 100-mesh or equivalent) at the valve inlet side.

※Failure to do so may hamper correct pressure control, which affects the original

performance.

(4) Install a safety valve at the valve outlet sides as safety device for equipment.

※Failure to do so prevents problem identification, resulting in equipment damage.

(5) Install a pressure gauge at both the inlet and outlet sides of the 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, affecting the original performance.

(7) When installing quick open and close valves, such as a solenoid valve, install it at

inlet side as much as possible, and secure at least 3 m from the valve.

※Failure to do so may result in malfunction or drastically shortened service life.

(8) When pressure reducing in two stages, secure at least 3 m between the valves.

※Failure to do so may result in malfunction, affecting the original performance.

(9) Install the valve in proper direction of the fluid flow.

※Failure to do so may affect the original performance.

(10) Do not apply excessive load, torque or vibration to the valve.

※Doing so may result in malfunction or drastically shortened service life.

(1) Install the valve perpendicularly to horizontal lines.

(2) Provide the by-pass line. (See 6.1 Example of piping)

(3) When the pressure reducing ratio is large, install a reducer to keep the flow velocity in the pipe

below 30 m/s or less.

(4) Provide space on the top and bottom of the valve so that the valve can be easily disassembled

and inspected. (See Fig.1)

(mm)

Fig.1

Nominal

size AB

15A

20A 125

25A 240 135

32A

40A 260 155

50A 270 175

65A 280 190

80A 300 225

100A 320 265

■EPDT-101■

‑8‑

7. Operating Procedure

7.1 Precautions during operation

Warning

(1) Do not touch the valve directly with bare hands.

※Doing so may result in burns.

(2) Before flow the steam in pipe line, make sure steam can flow without any dangerous at

the end of pipe line and pipe line is connected tightly.

※In case steam blow off, it may result in burns.

Caution

(1)Close the stop valves before and after the pressure reducing valve, and remove all

foreign matter and scales via the by-pass line before operation. And, open each stop

valve slowly.

※Failure to do so may prevent the valve from functioning correctly. And, It may cause

hunting, water hammer, etc., resulting in damage to the valve and other equipment

when the stop valve is opened quickly.

(2)Secondary pressure at by-pass line must be lower than set pressure.

※Safety valve blows in case secondary pressure at by-pass line becomes higher than

set pressure.

(3)When adjusting pressure, slowly increase loading air pressure.

※Incorrect adjustment may cause hunting, water hammer, etc., resulting in damage to

the valve and other equipment.

(4)Remove condensate completely from the line, and close the stop valves before and

after the valve when not using it for long periods of times.

※Rust generated in the valves and lines may cause malfunction.

7.2 Adjustment procedures

Follow the steps below, and slowly turn the adjusting screw to set pressure. Incorrect adjustment may

cause hunting, water hammer, etc., resulting in damage to the valve and other equipment.

（1）Close the stop valve at inlet and outlet side of the pressure reducing valve, and taking sufficient

time not to blow the safety valve, blow off the fluid to remove foreign matter via the by-pass

line. After blowing, close the by-pass line stop valve.

（2）Slowly open the stop valve at the inlet side of the pressure reducing valve, and adjust the travel of

the stop valve at the outlet side of the pressure reducing valve so that a little fluid flows.

（3）Set operating air pressure to no-pressure. And slowly increase the operating pressure until the

desired pressure is reached while observing the pressure gauge on the outlet side.

（4）Slowly open the stop valve at the outlet of the pressure reducing valve, and readjust the desired

pressure.

（5）After adjustment, secure the handle of the standard unit’s pressure reducing valve.

■EPDT-101■

‑9‑

8. Maintenance Procedure

8.1 Troubleshooting

Problem Cause Solution

Pressure does not

reach the desired

value.

1．Incorrect pressure is being used.

2．Strainer [26] is clogged.

3．Foreign matter exists between

piston [12] and cylinder [13].

4．Piston ring [14] is damaged.

5．Nominal size is too small for the

specifications.

6．Pressure is not adjusted correctly.

7．Strainer installed before pressure

reducing valve is clogged.

8．Pressure gauge is faulty.

9．Operating air pressure is being in-

sufficient.

1．Correct the pressure.

2．Disassemble and clean the strainer.

3．Disassemble and remove the foreign

matter. When any scratches are

identified, polish them away using a

paper. Change the parts if scratches

still exist after polishing.

4．Replace the piston ring.

5．Change the nominal size appro-

priately.

6．Observe the adjustment procedures

and readjust pressure.

7．Disassemble and clean it.

8．Replace it.

9．Raise the operating air pressure to

necessary set pressure.

Reduced pressure

raises above than

the specified value.

1．Foreign matter exists between

main valve [9] and main valve seat

[11], or scratches exist.

2．Foreign matter exists between

pilot valve [17] and pilot valve seat

[18], or scratches exist.

3．Foreign matter exists between

piston [12] and cylinder [13].

4．Trap is not provided for dead-end

line.

5．By-pass valve is leaking.

6．Diaphragm [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．Disassemble the pilot valve as-

sembly, and clean or replace it.

3．Disassemble and remove the foreign

matter. When any scratches are

identified, polish them away using a

paper. Change the parts if scratches

still exist after polishing.

4．Install a trap.

5．Repair or replace it.

6．Replace the diaphragm.

Abnormal noise is

heard.

1．Nominal size is too large for the

specifications.

2．Pressure reducing ratio is too large.

3．Drainage problem is caused.

4．An abrupt OPEN/CLOSE valve is

located too close to the pressure

reducing valve.

5．Outlet pipe is too small.

1．Change the nominal size appro-

priately.

2．Reduce pressure in two stages.

3．Install a trap.

4．Allow as much as possible between

the valves.

5．Select a pipe size that will produce a

flow velocity of 30m/s or less.

Other 1．Springs and diaphragm are worn. 1．Replace the springs and diaphragm.

lForeign matter and scales in a pipe may cause most of problems of pressure reducing valve. Be

careful sufficiently to foreign matter in a pipe.

lPhenomenon alike valve trouble may happen by fault of pressure gauge, fluid leakage from by-

pass valve, forgetting to close the by-pass valve, clogging strainer, and etc. First, check the said

particulars before above troubleshooting.

lConsult factory when cannot make a judgement whether parts need replacement or not.

Ce manuel convient aux modèles suivants

Table des matières

Autres manuels Yoshitake Unité de contrôle

Yoshitake

Yoshitake GLV-20F Manuel utilisateur

Yoshitake

Yoshitake DP-200 Series Manuel utilisateur

Yoshitake

Yoshitake AL-150T Series Manuel utilisateur

Yoshitake

Yoshitake BLV-2SF Manuel utilisateur

Yoshitake

Yoshitake DP-100 Series Manuel utilisateur

Yoshitake

Yoshitake GLV-16 Manuel utilisateur

Yoshitake

Yoshitake GLV-10F Manuel utilisateur

Yoshitake

Yoshitake PD-3 Manuel utilisateur

Yoshitake

Yoshitake TA-22ML Manuel utilisateur

Yoshitake

Yoshitake GP-27 Manuel utilisateur

Yoshitake

Yoshitake GD-27BP Manuel utilisateur

Yoshitake

Yoshitake AL-250 Manuel utilisateur

Yoshitake

Yoshitake GD-400 Manuel utilisateur

Yoshitake

Yoshitake SCV-3 Manuel utilisateur

Yoshitake

Yoshitake GP-2000 Manuel utilisateur

Yoshitake

Yoshitake AF-10EN Manuel utilisateur

Yoshitake

Yoshitake GD-21 Manuel utilisateur

Yoshitake

Yoshitake SCV-4 Manuel utilisateur

Yoshitake

Yoshitake BLV-1S Manuel utilisateur

Yoshitake

Yoshitake SU-20H Manuel utilisateur

Yoshitake

Yoshitake REDMAN DD-2 Series Manuel utilisateur

Yoshitake

Yoshitake OB-3 Manuel utilisateur

Yoshitake

Yoshitake MD-53 Manuel utilisateur

Yoshitake

Yoshitake TA-16 Series Manuel utilisateur

Manuels Unité de contrôle populaires d'autres marques

Festo

Festo Compact Performance CP-FB6-E Manuel de la liste des pièces

Elo TouchSystems

Elo TouchSystems DMS-SA19P-EXTME Manuel utilisateur

JS Automation

JS Automation MPC3034A Manuel utilisateur

JAUDT

JAUDT SW GII 6406 Series Guide rapide

Spektrum

Spektrum Air Module System Manuel utilisateur

BOC Edwards

BOC Edwards Q Series Manuel utilisateur

KHADAS

KHADAS BT Magic Manuel utilisateur

Etherma

Etherma eNEXHO-IL Manuel utilisateur

PMFoundations

PMFoundations Attenuverter Manuel utilisateur

GEA

GEA VARIVENT Manuel utilisateur

Walther Systemtechnik

Walther Systemtechnik VMS-05 Manuel utilisateur

Altronix

Altronix LINQ8PD Instructions de montage

Eaton

Eaton Powerware Series Manuel utilisateur

WAGO

WAGO 750-407/040-000 Manuel utilisateur

Sony

Sony CCU-590 Manuel utilisateur

Graco

Graco 25D614 Manuel utilisateur

Task Force Tips

Task Force Tips YE-RF-900 Manuel de programmation

Shini

Shini SPV-U Series Manuel utilisateur