The Yoshitake GD-47R is a direct/pilot type primary pressure regulating valve designed for steam applications. Equipped with a ductile cast iron (FCD450) body and stainless steel bellows, this pressure sustaining valve provides reliable external sensing control for heavy-duty uses with a wide range of flow rates. It is widely applicable in waste-heat boilers, air conditioning equipment, and various factory facilities.

Features

• Applicable on heavy-duty use for the wide range of flow rate.
• The application of this model is vast such as waste-heat boiler, air conditioning equipment and factory facilities.

Specifications

Application	Steam
Nominal size	50A
Pressure regulating range	0.2-0.9 MPa
Minimum differential pressure	0.05 MPa
Application temperature	220°C or less
Valve seat leakage	0.5% or less of rated flow rate
Primary pressure sensing method	External sensing type
Cv value	36
Connection	JIS 10K FF flanged

Materials

Part	Material
Body	Ductile cast iron (FCD450)
Valve	Stainless steel
Valve seat	Stainless steel
Bellows	Stainless steel

Included Accessories

An external sensing pipe (φ8-2 m) and an external joint (φ8-R 1/4) are included with the product.

Dimensions (mm) and Weight (kg)

Weight: 45 kg

Flow Characteristic Chart

Example of Piping

Sensing Pipe Connection Method

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

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. Sensing pipe should be connected as straight as possible, and should be cut if it is too long.

Cross-Sectional Drawing and Parts List

No.	Part Name	Material	Standard	Qty
28	Pipe	Copper	C1220T	1
27	Joint	Brass	C3604	2
24	Name Plate	Stainless Steel	SUS304	1
23	Gasket	Copper	C1100P	2
22	Gasket	Non-Asbestos	Non-Asbestos	1
21	Gasket	Non-Asbestos	Non-Asbestos	2
20	Plug	Steel	Steel	1
19	Bolt	Carbon Steel	SCM435	6
18	Bolt	Carbon Steel	SCM435	12
17	Lock Nut	Steel	Steel	1
16	Adjusting Screw	Steel	Steel	1
15	Top Spring Plate	Rolled Steel	SS400	1
14	Spring	Alloy Steel	SWOSC	1
13	Gasket	Copper	C1100P	1
12	Bottom Spring Plate	Rolled Steel	SS400	1
10	U Nut	Stainless Steel	SUS	1
9	Bellows	Stainless Steel	SUS316L	1
8	Guide	Stainless Steel	SUS403	2
7	Bottom Valve Seat	Stainless Steel	SUS420J2	1
6	Top Valve Seat	Stainless Steel	SUS420J2	1
5	Valve	Stainless Steel	SUS420J2	1

Note

This drawing may contain legally protected information such as confidential information. The production of prototypes and mass-produced products using this drawing, as well as the disclosure of content and information to third parties, is prohibited.