Yoshitake GD-43G-10 is a high-performance pressure reducing valve designed for air, carbon dioxide gas, nitrogen gas, and steam for washing or sterilization. The GD-41G and GD-43G series feature a pressure balance structure that maintains constant reduced pressure regardless of inlet pressure fluctuations, and uses stainless steel wetted parts for improved corrosion resistance.

Features

• Space saving and resource saving are achieved (used materials are shown on the body and lower cap, thus separate collection of parts for resource recycling is easy).
• Stainless steel (SCS14A and SUS316) is used for wetted parts, improving corrosion resistance.
• PTFE covers diaphragm contact surface to fluid, making the diaphragm less liable to deteriorate and highly durable.
• Special fluorine-contained rubber parts are resistant to corrosion.
• Pressure balance structure can keep the reduced pressure at a constant level without being affected by inlet pressure.
• Can be applied to piping washing, system washing, sterilization washing and steam for sterilization.
• Horizontal or vertical installation is available.

Specifications

Model	GD-41G	GD-43G-10	GD-43G-20
Application	Air, Carbon dioxide gas, Nitrogen gas; Steam for washing or sterilization	Air, Carbon dioxide gas, Nitrogen gas; Steam for washing or sterilization	Air, Carbon dioxide gas, Nitrogen gas; Steam for washing or sterilization
Inlet pressure	0.07-2.0 MPa* (0.2 MPa or less for steam for washing or sterilization)	0.07-1.0 MPa (0.2 MPa or less for steam for washing or sterilization)	0.07-2.0 MPa (0.2 MPa or less for steam for washing or sterilization)
Reduced pressure	(A) Yellow spring: 0.02-0.1 MPa (B) Red spring: 0.1-0.25 MPa (C) Black spring: 0.25-0.5 MPa	(A) Yellow spring: 0.02-0.1 MPa (B) Red spring: 0.1-0.25 MPa (C) Black spring: 0.25-0.5 MPa	(A) Yellow spring: 0.02-0.1 MPa (B) Red spring: 0.1-0.25 MPa (C) Black spring: 0.25-0.5 MPa
Minimum differential pressure	0.05 MPa	0.05 MPa	0.05 MPa
Maximum pressure reduction ratio	20:1	20:1	20:1
Fluid temperature	5-90°C (Max temperature of steam for washing or sterilization is 130°C. Allow an interval of at least four hours between steam blows.)	5-90°C (Max temperature of steam for washing or sterilization is 130°C. Allow an interval of at least four hours between steam blows.)	5-90°C (Max temperature of steam for washing or sterilization is 130°C. Allow an interval of at least four hours between steam blows.)
Body Material	Cast Stainless steel (SCS14A)	Cast Stainless steel (SCS14A)	Cast Stainless steel (SCS14A)
Valve disc Material	Special synthetic rubber (special FKM)	Special synthetic rubber (special FKM)	Special synthetic rubber (special FKM)
Diaphragm Material	Heat-resistant synthetic rubber and PTFE (PTFE applied to wetted face)	Heat-resistant synthetic rubber and PTFE (PTFE applied to wetted face)	Heat-resistant synthetic rubber and PTFE (PTFE applied to wetted face)
Connection	JIS Rc screwed	JIS 10K FF flanged	JIS 20K RF flanged

• The inlet pressure of GD-43G-10 is 0.07 to 1.0 MPa.

WARNING

If using for washing steam or sterilization steam, be sure that maximum temperature is 130°C and avoid continuous use for more than 30 minutes.

Dimensions and Weights

GD-43G Flanged Type

Nominal Size	D	C	g	t	f	n-h	Weight (kg)
15A	95	70	51	14(12)	1	4-15	2.8 (2.6)
20A	100	75	56	16(14)	1	4-15	3.0 (2.9)
25A	125	90	67	16(14)	1	4-19	4.0 (3.7)

• All dimensions are same except flange size. The values in parentheses are the weights and dimensions for the GD-43G-10.

GD-41G Screwed Type

Nominal size	d	Weight (kg)
15A	Rc 1/2	1.2
20A	Rc 3/4	1.1
25A	Rc 1	1.0

• All dimensions are same except connection size.

Selection Charts

Specifications Selection Chart (Air, carbon dioxide gas, and nitrogen gas)

Flow Characteristic Chart

Set pressure	Offset pressure
0.2 MPa or less	Within 0.05 MPa
More than 0.2 MPa	Within 0.08 MPa

Pressure Characteristic Chart

This chart shows variation in reduced pressure when the inlet pressure of 0.25 MPa is changed to 2.0 MPa while the reduced pressure is set at 0.20 MPa.

Nominal Sizes Selection Chart (For Air)

Cross Section Drawing