Yoshitake GP-1000TSS and GP-1000TAS are pilot-operated pressure reducing valves designed for air and non-corrosive gases. The GP-1000TSS features stainless steel wetted parts, while the GP-1000TAS is constructed entirely of stainless steel for maximum corrosion resistance. They offer a stable reduced pressure with an inlet pressure range of 0.1 to 1.0 MPa and zero valve seat leakage.

Features

1. Stainless steel is used for wetted parts (GP-1000TSS) and all parts (GP-1000TAS), improving corrosion resistance.
2. Free of valve seat leakage. Improved workability as a result of refinement of sliding parts.
3. Simple and robust internal structure.

Specifications

Item	Description
Application	Air, Other non-dangerous fluids
Inlet pressure	0.1-1.0 MPa
Reduced pressure	0.05-0.9 MPa
Adjusted reduced pressure	90% or less of inlet pressure (gauge pressure)
Minimum differential pressure	0.05 MPa
Maximum pressure reduction ratio	20:1
Application temperature	5-80°C
Valve seat leakage	None
Connection	JIS 10K FF flanged

Material

Part	Material
Body	Cast stainless steel
Valve	Stainless steel (NBR contained)
Valve seat	Stainless steel
Piston, cylinder	Stainless steel
Diaphragm	Stainless steel

WARNING

Use on a compressed air system with air from oil-free compressors may cause deterioration of rubber parts in a short time (ozone crack). Please consult with us before such installation.

Dimensions (mm) and Weights (kg)

Nominal size	L	H1	H	Weight
15A	150	67	288 (298)	8.3 (8.5)
20A	155	67	288 (298)	8.8 (9.0)
25A	160	70	303 (313)	10.5 (10.7)
32A	190	85	326 (336)	14.8 (15.0)
40A	190	85	326 (336)	15.3 (15.5)
50A	220	96	350 (360)	20.8 (21.0)

The above values in parentheses are the dimensions and weights of the GP-1000TAS.

Performance Charts

Loading Air Pressure-set Pressure Chart

Specifications Selection Chart Find the intersection point of the inlet and reduced pressures. If the intersection point is within range (A), the pressures are controllable. The valve does not fulfill specified performance if the intersection point lies in range (B).

Table of Corrected Cv Values If the inlet pressure exceeds 0.7 MPa, and the pressure reducing ratio exceeds 10:1, find the appropriate correction coefficient C using chart above, and multiply the rated Cv value, and obtain the corrected Cv value.

Flow Characteristic Chart

Pressure Characteristic Chart This chart shows variation in reduced pressure when the inlet pressure of 1.0 MPa is changed between 0.3 MPa and 1.0 MPa while the reduced pressure is set at 0.1 MPa.

Nominal Sizes Selection Chart (Fluid: 20°C Air)

Operation

No.	Parts name
1	Body
5	Diaphragm
8	Adjusting spring
9	Adjusting screw
11	Main valve
12	Main valve seat
14	Piston
15	Cylinder
18	Pilot valve
19	Pilot valve seat
28	Strainer
42	Inlet press. passage
43	Reduced press. Sensing port
44	Diaphragm chamber

The pressure reducing valve reduces pressure by the throttling the valve. The valve is composed of the main valve and main valve seat for throttling, and adjusting spring, diaphragm, pilot valve, and piston for pressure sensing and activation.

1. When the pressure reducing valve is mounted correctly, releasing the compression of adjusting spring allows the spring to close main valve and pilot valve. Slowly open the gate valve and allow the high pressure fluid to flow in.
2. Turing adjusting screw clockwise compresses the spring, which flexes diaphragm to open the pilot valve.
3. Inlet pressure via inlet pressure passage and pilot valve enters the upside of the piston. The pressure overrides the pressure on the downside of the main valve and the load of main valve spring, to open the main valve. The fluid then begins to flow from the inlet side.
4. Reduced pressure is led to diaphragm chamber via reduced pressure sensing port. The diaphragm receives the reduced pressure to be balanced with the adjusting spring load, and control the pilot valve travel.
5. The change of pilot valve travel changes the flow rate of fluid to the upside of the piston, and controls the main valve travel to obtain appropriate reduced pressure.

Exploded Drawing