Yoshitake GP-1210S is a pilot-operated, pneumatic remote type pressure reducing valve for steam. It features a simple and robust internal structure and is well-suited for systems where the pressure setting is frequently changed, or for centralized control systems. The "S" designation indicates that the trim parts (piston and cylinder) are made of stainless steel for enhanced durability.

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.
• Can be used as pneumatic, remote type valves, making them well suited for systems where the pressure setting is frequently changed.

Specifications

Model	GP-1210S (GP-1210)
Application	Steam
Inlet Pressure	0.1 - 1.0 MPa
Reduced Pressure	0.05 - 0.9 MPa (90% or less of inlet pressure)
Minimum Differential Pressure	0.05 MPa
Maximum Pressure Reduction Ratio	20:1
Maximum Temperature	220°C
Valve Seat Leakage	0.01% or less of rated flow
Connection	JIS Rc Screw
Body Material	Ductile cast iron
Valve & Valve Seat Material	Stainless steel
Piston & Cylinder Material	Stainless steel (for S type)

Dimensions and Weights

Size	d	L	H	H1	Weight (kg)
15A	Rc 1/2	150	220	64	7.0
20A	Rc 3/4	155	220	64	7.0
25A	Rc 1	160	235	67	8.5
32A	Rc 1-1/4	190	258	82	12.0
40A	Rc 1-1/2	190	258	82	12.5
50A	Rc 2	220	282	93	18.0

Rc1/4 Air loading pressure port.

Operation

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

1. When the pressure reducing valve is mounted correctly, the main valve and pilot valve should be closed when air pressure is no-pressure because of spring force.
2. Introducing air pressure into the air chamber flexes the pilot diaphragm to open the pilot valve.
3. Inlet pressure via the 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 the main valve spring, opening the main valve.
4. Reduced pressure is led to the diaphragm chamber via the reduced pressure sensing port. The diaphragm receives the reduced pressure to be balanced with the air loading pressure, and controls the pilot valve travel.

Installation

WARNING

Because of heavy weight, hold the valve with lifting equipment while piping. In case installing a safety valve as a safety device at the outlet side, joint relief pipe at the outlet of the safety valve and guide it to a safety place where steam can relief out.

• Install a strainer (Recommendation: 80-100mesh or equivalent) at the valve inlet side.
• Install a safety valve at the valve outlet side as a safety device for equipment.
• 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, install it at the inlet side as much as possible, and secure at least 3 m from the valve.
• Install the valve perpendicularly to horizontal lines.
• Provide the by-pass line.

TIP

Provide space on the top and bottom of the valve so that the valve can be easily disassembled and inspected.