Yoshitake GD-55R, 56R, and 91R are home boiler regulators used for hot water heat exchangers in cold areas. They feature back-flow prevention, negative pressure operation, pressure balancing, an automatic recovery drain tap, and a strainer.

Features

1. The valve is a pressure balance structure.
2. Pipes can be installed either horizontally or vertically.
3. Drain tap can operate by pushing and automatically recovers to the initial position.
4. GD-91R can be easily installed by a cap nut, since the outlet connection is a parallel screw.
5. Valve and diaphragm are made of chlorine resistance synthetic rubber.

Specifications

Specification	Value
Application	Cold and hot water
Inlet pressure	100-750 kPa
Standard set pressure	80±6 kPa
Body	Bronze
Diaphragm	Synthetic rubber
Valve · Check valve	Synthetic rubber
Strainer	Screen: Stainless steel, Frame: Synthetic resin
Strainer mesh	60 mesh
Maximum temperature	60°C
Connection	GD-55R · 56R: JIS Rc 3/4 GD-91R: JIS G 3/4
Install direction	Horizontal and vertical

INFO

Standard set pressure 65 kPa (JIS approved) is available for GD-55R-65 and GD-56R-65.

Dimensions (mm) and Weights (kg)

Pressure Characteristic Chart

Flow Characteristic Chart

Maximum Pressure of Water Pressure Reducing Valve, Relief Valve and Hot Water Heat Exchanger

Water pressure reducing valve	Relief valve for hot water maker	Max. pressure of hot water heat exchanger
80	95, 97	100
85	97	100
120	190	200
150	190	200
170	190	200

WARNING

Attention Using the bold font valves to simple boiler (100 kPa) is illegal.

Piping Example

Drawing and Parts List

No.	Part Name	Material	Qty
36	Label	Polyester	1
35	Label	Polyester	1
34	Push Nut	Stainless Steel	1
33	Spring	Stainless Steel	1
32	Cap	POM	1
31	Spring	Stainless Steel	1
30	Breaker Valve	Stainless Steel	1
29	O-Ring	NBR	1
28	O-Ring	NBR	1
27	Water Vent Plug	Brass	1
26	O-Ring	NBR	1
25	O-Ring	NBR	1
24	Strainer Cap	Brass	1
23	Push Nut	Stainless Steel	1
22	Spring	Stainless Steel	1
21	O-Ring	NBR	1
20	Strainer	Stainless Steel & POM	1
19	Disc	NBR	1
18	Holder	POM	1
17	Adjusting Screw	Brass	1
16	Spring Plate	Carbon Steel	1
15	Spring	Piano Wire	1

Specification	Value
Applicable fluid	Cold / hot water
Primary pressure	100~750 kPa
Set pressure	80 ± 6 kPa
Open flow rate	30L/min or more
Applicable temperature	0~60 °C (No freezing. Except when draining water.)
Pressure characteristics	Within tolerance of set pressure
Withstand pressure (water pressure)	1.75 MPa
Strainer	60 mesh

INFO

*Open flow rate is the flow rate when the primary pressure is maintained at 100 kPa and the secondary side is open.