Yoshitake GD-200 series pressure reducing valves are designed for cold and hot water, oil (kerosene, heavy oils A and B), air, and other non-dangerous fluids. These ductile cast iron valves utilize a pressure balance structure to maintain reduced pressure at a constant level, unaffected by inlet pressure fluctuations. The series includes the standard GD-200, the GD-200H for higher inlet pressures (up to 2.0 MPa), and the GD-200C-N with a Nylon 11 coated body for excellent corrosion resistance.

Features

• The pressure balance structure can keep the reduced pressure at a constant level without being affected by inlet pressure.
• Highly wear-resistant and durable stainless steel valve seat.
• Maintenance and inspection can be conducted easily by disassembling simply from the upper side.
• A rubber disc prevents leakage when the valve is closed.
• The GD-200C-N provides excellent corrosion resistance due to inner and outer body surfaces coated with Nylon 11.
• Horizontal or vertical installation is possible. (For above 80A, horizontal piping with upward posture.)

Specifications

Model	GD-200	GD-200C-N	GD-200H
Application	Cold and hot water, Oil, Air, Other non-dangerous fluids	Cold and hot water	Cold and hot water, Oil, Air, Other non-dangerous fluids
Inlet Pressure	1.0 MPa or less	1.0 MPa or less	2.0 MPa or less
Minimum Differential Pressure	0.05 MPa	0.05 MPa	0.05 MPa
Maximum Pressure Reduction Ratio	10:1	10:1	10:1
Application Temperature	5-80°C	5-60°C	5-80°C
Body Material	Ductile cast iron	Ductile cast iron	Ductile cast iron
Valve Seat Material	Stainless steel	Stainless steel	Stainless steel
Valve Disc / Diaphragm	NBR	EPDM or FKM	NBR
Connection	JIS 10K FF flanged	JIS 10K FF flanged	JIS 20K RF flanged

Options

• GD-200, 200C-N, 200H are available with FKM type (except for GD-200H of 65A to 150A).
• GD-200, 200H are available with a pressure gauge (JIS Rc1/4). JIS Rc3/8 is also available upon request.

Dimensions and Weights

Nominal Size	L	H (GD-200)	H (GD-200H)	H1	Weight (kg) GD-200	Weight (kg) GD-200H
15A	145	310	310	57	8.2	8.2
20A	150	310	310	57	8.2	8.2
25A	150	333	333	67	10.0	10.0
32A	195	397	397	76	17.3	17.3
40A	195	397	397	76	17.3	17.3
50A	195	415	415	81	19.2	19.2
65A	270	555	555	110	40.0	40.0
80A	270	582	582	125	43.7	43.7
100A	308	645	645	143	70.0	70.7
125A	380	849	849	179	144.0	145.0
150A	400	918	918	204	173.0	175.0

Characteristics

Flow Characteristic Chart

Pressure Characteristic Chart

This chart shows variation in reduced pressure when the inlet pressure of 1.0 MPa is changed between 0.15 MPa and 1.0 MPa while the reduced pressure is set at 0.10 MPa.

Structure

If the adjusting screw is turned right, the diaphragm will be depressed with the spring and the valve disc connected with the spindle will open. Load to the diaphragm balances with the load of the spring, adjusting the opening of the main valve to regulate the reducing pressure.

Nominal Size Selection

Installation Cautions

• Install a strainer at the valve inlet side to ensure correct pressure control.
• Install a bypass line to allow for system operation during inspection and maintenance.
• For gas applications, install a trap to the inlet sides of the valve to prevent drainage problems.
• Ensure enough space above the center of the pipeline for maintenance.