Yoshitake GPK-2001 and GPK-2003 are remote control steam pressure reducing valves. They are superior to piston type valves in capacity and performance, being very effective in controlling inlet pressure and flow rate fluctuations. The spherical main valve offers great sealability and significantly reduces valve seat leakage (compliant with ANSI Class IV). The remote control capability makes pressure adjustment easy with a wide pressure setting range. The GPK-2001 and GPK-2003 can be selected based on the loading air pressure.

Features

• Superior capacity and performance compared to piston type valves.
• Spherical main valve reduces valve seat leakage (ANSI Class IV).
• Remote control for easy pressure adjustment and a wide pressure setting range.
• Ratio of control pressure to setting pressure: GPK-2001 is 1:1; GPK-2003 is 1:3.5.
• External sensing method is standard (internal sensing available upon request).

Specifications

Specification	GPK-2001	GPK-2003
Application	Steam	Steam
Sensing Method	External sensing	External sensing
Connection	JIS Rc screwed, JIS 20K RF flanged, JIS 10K FF flanged	JIS Rc screwed, JIS 20K RF flanged, JIS 10K FF flanged
Nominal Size	15–50A (Screwed), 15–100A (Flanged)	15–50A (Screwed), 15–100A (Flanged)
Inlet Pressure	0.1–2.0 MPa (JIS Rc, 20K), 0.1–1.0 MPa (JIS 10K)	0.25–2.0 MPa (JIS Rc, 20K), 0.25–1.0 MPa (JIS 10K)
Reduced Pressure	0.05–0.9 MPa (JIS Rc, 20K), 0.05–0.85 MPa (JIS 10K)	0.2–1.4 MPa (JIS Rc, 20K), 0.2–0.85 MPa (JIS 10K)
Min. Differential	0.05 MPa	0.05 MPa
Max. Reducing Ratio	20:1	10:1
Max. Temperature	220°C	220°C

Materials

Part	Material
Body	Ductile cast iron
Main Valve	Stainless steel
Main Valve Seat	Stainless steel
Pilot Valve	Stainless steel
Diaphragm	Stainless steel

Dimensions and Weights

Screwed Type (JIS Rc)

Nominal Size	L (GPK-2001)	L (GPK-2003)	H (GPK-2001)	H (GPK-2003)	Weight (GPK-2001)	Weight (GPK-2003)
15A	150	150	335	353	14.0 kg	17.5 kg
20A	150	150	335	353	14.0 kg	17.5 kg
25A	160	160	341	359	18.5 kg	22.0 kg
32A	180	180	371	389	21.5 kg	25.0 kg
40A	180	180	371	389	21.5 kg	25.0 kg
50A	230	230	435	453	33.0 kg	36.5 kg

Flanged Type (JIS 20K RF)

Nominal Size	L	H (GPK-2001)	H (GPK-2003)	Weight (GPK-2001)	Weight (GPK-2003)
15A	146	335	353	15.5 kg	19.0 kg
20A	146	335	353	16.0 kg	19.5 kg
25A	156	341	359	21.0 kg	24.5 kg
32A	176	371	389	24.0 kg	27.5 kg
40A	196	371	389	24.5 kg	28.0 kg
50A	222	435	453	36.0 kg	39.5 kg
65A	282	489	507	64.5 kg	68.0 kg
80A	302	512	530	71.5 kg	75.0 kg
100A	342	595	613	111.0 kg	114.5 kg
(Note: Length and weight vary slightly for JIS 10K FF connections)

Operation

The pressure reducing valve reduces pressure by throttling the valve. The assembly is composed of the main valve, main valve seat, a pressure adjusting air chamber, the main diaphragm, pilot diaphragm, and a pilot valve for pressure sensing and activation.

Caution

When installing the pressure reducing valve, be sure to connect the provided sensing pipe and joint. Unless the sensing pipe is connected, the valve will not operate. Furthermore, steam may blow off, resulting in burns.

Selection and Installation

When selecting a nominal size, use the Nominal Size Selection Chart to find the intersection of inlet pressure and reduced pressure. Set the flow rate at 80 to 90% of the rated flow rate, allowing for the pressure and heat loss of the stop valve and strainer to be used before or after the pressure reducing valve.

Installation Recommendations

• Install a strainer (80 mesh) at the pressure reducing valve inlet side, matching the nominal diameter.
• Install a bypass pipe around the pressure reducing valve to avoid stopping operations during maintenance.
• Install a steam trap to the inlet sides of the valve to prevent drainage problems.
• Ensure the sensing pipe is connected appropriately, observing a recommended straight length of 10 times the line pipe diameter from valves and elbows to minimize vibration.