Yoshitake GP-1002 is a pilot-operated piston-type pressure reducing valve designed for steam applications. It features a ductile cast iron body with stainless steel trim, operating with an inlet pressure range of 0.1 to 0.5 MPa and providing a reduced pressure of 0.03 to 0.15 MPa. The spherical main valve ensures excellent sealability and significantly reduces valve seat leakage, complying with ANSI Class IV standards.

Features

• Significantly improved workability and durability compared with conventional pressure reducing valves.
• Spherical main valve offers great sealability and great reduction of valve seat leakage (compliant with ANSI Class IV).
• Compliant with SHASE-S106 Pressure Reducing Valves (by the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan).
• Simple and robust internal structure.

Dimensions and Weights

Nominal size	L	H1	H	Weight (kg)
15A	150	64	285	8.0
20A	155	64	285	8.5
25A	160	67	300	10.0
32A	190	82	323	14.0
40A	190	82	323	14.5
50A	220	93	347	20.0
65A	245	100	357	30.0
80A	290	122	404	35.0
100A	330	144	450	52.5

Operation

The pressure-reducing valve reduces pressure by throttling the valve. It 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.

Selection Charts

Specifications Selection Chart

Find the intersection point of the inlet and reduced pressures. If the intersection point is within range (B) or (C) as shown in the chart above, the pressures are controllable by the GP-1002.

Nominal Sizes Selection Chart (For Steam)

Installation

Example of Piping

WARNING

• Because of heavy weight, hold the valve with lifting equipment while piping.
• Install a safety valve at the valve outlet sides as a safety device for equipment. Joint relief pipe at outlet of safety valve and guide it to a safety place where steam can relief out.

INFO

• Remove foreign matter and scales from the lines before connecting the valve.
• Install a strainer (Recommendation: 80-100mesh or equivalent) at the valve inlet side.
• Install a pressure gauge at both the inlet and outlet sides of the valve.
• Install a steam trap to the inlet sides of the valve to prevent drainage problems.
• When installing quick open and close valves, such as a solenoid valve, secure at least 3 m from the valve.

Maintenance and Disassembly

Consumable parts and their recommended replacement periods:

Name of parts	Replace period
Diaphragm	2 years
Piston ring	3 years
Inner ring	3 years
Pilot valve assembly	5 years
Strainer	5 years
Gaskets	2 years