Yoshitake GPR-2000 primary pressure regulating valves for steam are diaphragm-type, pilot-operated primary pressure regulating valves applicable for heavy-duty use over a wide range of flow rates. Typical applications include construction sites, air-conditioning plants, and factory facilities.

Key features include large capacity with distinguished performance, and excellent sealability ensured by a spherical valve. The main valve, main valve seat, pilot valve, and pilot valve seat are made of stainless steel for distinguished durability. The valve offers a wide pressure adjustment range of 0.02 to 1.4 MPa depending on the specific model specifications.

Features

1. Large capacity and distinguished performance.
2. Excellent sealability ensured by spherical valve. Distinguished durability of stainless steel made valve and valve seat.
3. Wide range pressure adjustment.

Screwed type

Flanged type

Specifications

Application	Steam
Primary pressure sensing method	External sensing type *1
Pressure regulating range	0.02-0.15 MPa *2 0.1-1.0 MPa 1.0-1.4 MPa
Minimum differential pressure	15% of set pressure (gauge pressure) (Minimum value: 0.10 MPa)
Fluid temperature	220℃ or less
Valve seat leakage	0.01% of rated flow rate
Body Material	Ductile cast iron (FCD450)
Main valve Material	Stainless steel
Valve seat Material	Stainless steel
Pilot valve Material	Stainless steel
Pilot valve seat Material	Stainless steel
Diaphragm Material	Stainless steel
Connection	JIS Rc screwed, JIS 20K RF flanged, JIS 10K FF flanged

INFO

*1 External sensing method is used for the product because of controllability(performance). Available with internal sensing type, but the Cv value is different. *2 When the set pressure is between 0.02 MPa and 0.1 MPa, back pressure should not exist.

Dimensions and Weights

Screwed type (JIS Rc)

Nominal size	d	L (mm)	H1 (mm)	H (mm)	A (mm)	Weight (kg)
15A	Rc 1/2	150	170	398	200	14.5
20A	Rc 3/4	150	170	398	200	14.5
25A	Rc 1	160	175	404	226	18.8
32A	Rc 1-1/4	180	192	434	226	22.0
40A	Rc 1-1/2	180	192	434	226	22.0
50A	Rc 2	230	216	498	276	33.6

Available with NPT connection.

Flanged type (JIS 20K RF)

Nominal size	L (mm)	H1 (mm)	H (mm)	A (mm)	Weight (kg)
15A	146 (142)	170	398	200	16.0 (15.8)
20A	146 (142)	170	398	200	16.5 (16.3)
25A	156 (152)	175	404	226	21.5 (21.1)
32A	176 (172)	192	434	226	24.5 (24.0)
40A	196 (192)	192	434	226	25.0 (24.6)
50A	222 (218)	216	498	276	36.6 (36.4)
65A	282 (278)	251	552	352	64.9 (64.6)
80A	302 (294)	264	575	352	72.1 (69.9)
100A	342 (330)	321	658	401	108.0 (104.0)

INFO

• The values in parentheses are the dimensions and weights of JIS 10K FF flanged.
• Please contact us for flanged type other than the above.

Performance Charts

Specifications Chart In this range, keep the outlet pressure at 0 MPa.

Flow Rate Characteristics Chart

Operation

No.	Parts name
1	Body
2	Pilot body
6	Main valve
7	Main valve seat
12	Main diaphragm
13	Main valve spring
15	Screen
17	Pilot valve
18	Pilot valve seat
23	Pilot diaphragm
25	Spring
28	Adjusting Screw
32	Joint
33	Elbow
35,36,37	Pipe A, B, C
12-1	Main diaphragm chamber
23-1	Pilot diaphragm chamber
48-1	Inlet pressure sensing port

1. When adjusting screw [28] is turned in the clockwise direction, spring [25] is compressed and pilot valve [17] is closed. When the inlet stop valve is opened, a flow of steam is introduced. This flow of steam proceeds to the back side of main valve [6] and pilot valve, and also flows through inlet pressure sensing port [48-1] and into pilot diaphragm chamber [23-1].
2. As the inlet steam pressure increases, the pressure in the pilot diaphragm chamber also increases until it overcomes the adjustment spring load, thereby opening the pilot valve. The steam then proceeds through pilot valve seat [18] and through pipe A [35]. Part of the steam flow then proceeds through pipe B [36] and joint [32] to the outlet side of body [1]. The other part of the steam flow proceeds through pipe C [37] and elbow [33] to main diaphragm chamber [12-1]. As the steam pressure increases in the main diaphragm chamber, it forces the main valve open, releasing steam to the outlet side.
3. As the inlet steam pressure decreases, it is overcome by the spring load, causing the pilot valve to close. This decreases the steam pressure in the main diaphragm chamber, causing the main valve to close, and the flow of steam to stop. Because the inlet steam pressure in the pilot diaphragm is balanced against the spring load, the pilot valve opening increases and decreases in accordance with the rising and falling inlet pressure. The main valve opening is also adjusted in accordance with the amount of steam flowing into the main diaphragm chamber, thereby keeping the inlet pressure constant.

Selection of Nominal Size

Find the point of intersection of primary and secondary pressure, in case that the point is located within the range A and B, the valve is suitable to regulate the pressure.

• Range (A): Controllable at 0 MPa outlet pressure.
• Range (B): Controllable range.
• Range (C): Unable to fulfill the required function.

Nominal size selection chart

For example, take a primary pressure regulating valve whose inlet pressure(P1) is 0.6 MPa, outlet pressure(P2) 0.4 MPa, flow rate 600 kg/h. When determining the nominal size, find the point of intersection(A) of inlet pressure 0.6 MPa and outlet pressure 0.4 MPa. Vertically proceed from point(A) to come across the flow rate 600 kg/h, and regard this point as (B). Point(B) is between nominal sizes 20A and 25A. Select the larger nominal size (in this example, nominal size 25A).

Nominal size selection calculation formula

In case selecting the suitable valve size from calculation, find the Cv value with formula, which value will be defined by applying criteria, and select the valve size that fulfills the said Cv value.

Cv value chart

15A	20A	25A	32A	40A	50A	65A	80A	100A
5.0	7.2	10.9	14.3	18.8	32.0	60.0	78.0	120.0

Installation Procedures

Example of piping

Warnings/Cautions during installation

Warning

(1) As this product is considerably heavy in weight, please secure it with lifting devices for installation on piping.

• Falling the product may cause the injury of personnel.

(2) When installing the combination valve, be sure to connect the provided sensing pipe and joint.

• Unless the sensing pipe is connected, the valve will not operate. Further, steam may blow off, resulting burns.

Fig.1 Connect the provided sensing pipe (φ8-2m) and joint (φ8-R1/4) as shown in the illustration in Fig.1.

1. Wind sealing tape around the joint and insert the joint into the pressure sensing side.
2. Fully insert the sensing pipe into the valve and the pressure sensing side joint. Tighten the cap nut until it can no longer be rotated manually, and then turn the cap nut about one and quarter times with a tool.
3. Note that the sensing pipe must be connected so that the valve side is higher than the pressure sensing side.

Caution

(1) Do not disassemble the valve unreasonably. (2) Remove foreign matter and scales from the lines before connecting the valve. (3) Install a strainer (80 mesh) at the valve inlet side. (4) Install a pressure gauge at both the inlet and outlet sides of the valve. Further, install the gauge at the outlet side as close to the sensing pipe (pressure sensing side) as possible. (5) Install a trap to the bottom of rising pipes and the end of other pipes connected to the inlet and outlet sides of the valve. When connecting a branch pipe from the main line, be sure to connect the trap draining drip leg from the bottom of the main line. (6) Install the valve perpendicularly to horizontal lines with the diaphragm chamber located at the bottom. (7) Be extremely careful not to damage the copper pipe. (8) Do not apply excessive load, torque or vibration to the valve. (9) Use the sensing pipe (φ8-2m) and joint (φ8-R1/4) provided. (10) Use the gate valve as a stop valve at the inlet and outlet sides of the combination valve. (11) When installing, reserve the space shown below (Fig.2) in both upper and lower side of the pipe center of the product for the maintenance and checking.

Fig.2

Size	A (mm)	B (mm)	C (mm)
15A, 20A	340	340	180
25A	340	350	200
32A, 40A	360	380	200
50A	400	430	220
65A	420	370	260
80A	430	390	260
100A	450	470	280

Disassembly Drawing