Yoshitake GP-2000CS pressure reducing valve for steam is a pilot-operated diaphragm type valve. It can control a larger flow of fluid than piston types, offering superior controllability for pressure fluctuation of the inlet side or load fluctuation of the outlet side. It can be widely used in building utilities systems, air-conditioning systems, and factory systems.

Features

• The large diaphragm area and external sensing structure achieve stable reduced pressure control and a large Cv value.
• A 200 mesh integral screen prevents most scale problems on the pilot valve.
• The spherical valve provides a tight seal meeting ANSI Class IV.

Specifications

Model	GP-2000CS
Application	Steam
Reduced pressure sensing method	External sensing *
Max. inlet pressure	3.0 MPa / 1.0 MPa / 2.0 MPa
Reduced pressure	0.02-0.15 MPa, 0.1-1.4 MPa, 1.3-2.0 MPa / 0.02-0.15 MPa, 0.1-0.85 MPa / 0.02-0.15 MPa, 0.1-1.4 MPa, 1.3-1.7 MPa
Minimum differential pressure	0.05 MPa
Maximum pressure reduction ratio	20:1
Maximum temperature	260°C
Valve seat leakage	0.01% or less of rated flow rate
Body Material	Cast carbon steel (WCB)
Main valve & seat Material	Stellite overlaid stainless steel
Pilot valve & seat Material	Stainless steel
Diaphragm Material	Stainless steel
Connection	JIS Rc screwed, JIS 10K FF flanged, JIS 20K RF flanged, JIS 30K RF flanged, ASME/EN flanged

INFO

• Please prepare a sensing pipe at your end. Joint size is as follows:

• JIS Rc, JIS SW, JIS 10K FF, 20K RF and 30K RF: Rc 1/4
• NPT, ASME class 150 and 300: NPT 1/4 Make the length of the sensing pipe less than 5 m. When installing the pressure reducing valve, be sure to connect the sensing pipe and joint. Unless the sensing pipe is connected, the valve will not operate.

Dimensions and Weights

JIS Rc Screwed

Nominal size	d	L (mm)	H (mm)	H1 (mm)	Weight (kg)
15A	Rc 1/2	150	398	200	16.0
20A	Rc 3/4	150	398	200	16.0
25A	Rc 1	160	404	226	21.5
32A	Rc 1-1/4	180	434	226	24.0
40A	Rc 1-1/2	200	434	226	24.0
50A	Rc 2	230	498	276	37.0

JIS 30K RF Flanged

Nominal size	L (mm)	H (mm)	H1 (mm)	Weight (kg)
50A	230	498	216	42.0
65A	294	552	251	75.5
80A	314	575	264	84.0
100A	358	658	321	133.0

Specifications Selection

Based on the selection chart above, select a pressure reducing valve in the optimum manner. Find the intersection point of the inlet pressure (P1) and the reduced pressure (P2). Two-stage pressure reduction is required if the intersection point lies in range (A). The pressures are controllable with a single pressure reducing valve if the intersection point is within range (B). The valve does not fulfil specified performance in range (C). To adopt two-stage pressure reduction, separate two pressure reducing valves as far away from each other as possible (at least 3M).

When selecting a nominal size, set the flow rate at 80 to 90% of the rated flow rate, allowing for the pressure loss and heat loss of the stop valve, strainer, etc. to be used before or after the pressure reducing valve.

Characteristic Charts

Flow Characteristic Chart Shut-off pressure rise: 0.02 MPa or less. Offset: 10% or less of setting pressure at outlet side (Minimum value: 0.02 MPa).

Pressure Characteristic Chart This chart shows variation in reduced pressure when the inlet pressure of 1.75 MPa is changed between 0.2 MPa to 2.0 MPa while the reduced pressure is set at 0.14 MPa.

Operation

The pressure reducing valve reduces pressure by throttling action, composed of the main valve, main valve seat, adjusting spring, pilot diaphragm, pilot valve, and main diaphragm.

1. When the adjusting spring is free of load, the main valve and pilot valve are closed. High-pressure fluid applies inlet pressure to the upside of the main valve and downside of the pilot valve.

2. Turning the adjusting screw clockwise compresses the spring, bending the pilot diaphragm to open the pilot valve. Fluid enters the main diaphragm chamber and also flows to the outlet side.

3. Increased flow through the pilot valve raises operating pressure in the main diaphragm chamber, overriding the main valve spring load and opening the main valve.

4. Outlet pressure is led to the pilot diaphragm chamber via the sensing pipe, balancing with the adjusting spring load. The pilot valve travel controls the main valve travel to maintain reduced pressure.

5. When fluid does not flow at the outlet, pressure in the pilot diaphragm chamber rises to close the pilot valve. The main valve is then closed by the main valve spring.

Installation and Piping

WARNING

1. Before installing the product, remove foreign substances and scale from the piping.
2. Make sure to install a strainer (80 mesh) to the inlet side of the product.
3. Install a safety valve for equipment protection at the outlet side of the product.
4. Make sure to install pressure gauges at the inlet and outlet sides of the product.
5. Make sure to install a trap at the inlet side of the product to prevent hazards caused by condensate.

Sensing Pipe Connection Connect the sensing pipe and the joint from the connection port of the product to the outlet piping. Make the connection port of the product be above the level of the side opposite to the connection port of the product. Make the length of the sensing pipe less than 5 meters.

Exploded View