Yoshitake GP-1010T Series pressure reducing valves for air and non-corrosive gases are pilot-operated valves which can be used with confidence for small to large flow rates, in a host of applications ranging from building utilities systems, air-conditioning systems, and factory systems.

Features

• Far superior to conventional pressure reducing valve in workability and durability.
• Free of valve seat leakage. Improved workability as a result of refinement of sliding parts.
• Simple and robust internal structure.

Specifications

Model	GP-1000T	GP-1010T	GP-1200T	GP-1210T
Connection	Flanged (JIS 10K FF)	JIS Rc screwed	Flanged (JIS 10K FF)	JIS Rc screwed
Nominal size	15~100A	15~50A	15~100A	15~50A
Application	Air and non-corrosive gases	Air and non-corrosive gases	Air and non-corrosive gases	Air and non-corrosive gases
Control type	Spring type	Spring type	Air-loaded type	Air-loaded type
Inlet pressure	0.1-1.0 MPa	0.1-1.0 MPa	0.1-1.0 MPa	0.1-1.0 MPa
Reduced pressure	0.05-0.9 MPa	0.05-0.9 MPa	0.05-0.9 MPa	0.05-0.9 MPa
Min. differential pressure	0.05 MPa	0.05 MPa	0.05 MPa	0.05 MPa
Max. pressure reducing ratio	20:1	20:1	20:1	20:1
Max. temperature	80°C	80°C	80°C	80°C
Valve seat leakage	Zero	Zero	Zero	Zero

Note: Available with stainless steel made trim parts (piston, cylinder and valve) as GP-TS.

Caution

Please collate with attached nameplate and specification of ordered model. Please consult factory in case they do not match each other.

Dimensions and Weights

Size	d	L	H	H1	Weight (kg)
15A	Rc 1/2	150	285	64	7.0
20A	Rc 3/4	155	285	64	7.0
25A	Rc 1	160	300	67	8.5
32A	Rc 1-1/4	190	323	82	12.0
40A	Rc 1-1/2	190	323	82	12.5
50A	Rc 2	220	347	93	18.0

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 throttling the valve. The valve is composed of the main valve and main valve seat for throttling, and adjusting spring (air-loaded pressure when the remote control type is used), 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 [8] allows the spring to close main valve [11] and pilot valve [18]. Slowly open the gate valve and allow the high pressure fluid to flow in. Inlet pressure is applied to the downside of the main valve. High pressure fluid passes through strainer [28] via inlet pressure passage [42] to also apply inlet pressure to the downside of the pilot valve.
2. Turing adjusting screw [9] clockwise compresses the spring, which flexes diaphragm [5] 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 [44] via reduced pressure sensing port [43]. 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.

Selection Method

Specifications Selection

Find the intersection point of the inlet and reduced pressures. The GP-1000T series valves are suitable within range (A). When within range (B), maximum performance cannot be obtained.

Flow Rate Characteristics

• Shut-off pressure raise: 0.02 MPa or less
• Offset: 0.03 MPa or less (Setting pressure: 0.05~0.1 MPa); 0.05 MPa or less (Setting pressure: 0.1~0.9 MPa)

Pressure Characteristics

Nominal Size Selection

Installation

Warning

• Because of heavy weight, hold the valve with lifting equipment while piping. Failure to do so may result in injury due to dropping the valve.
• In case installing safety valve as safety device at outlet side, joint relief pipe at outlet of safety valve and guide it to safety place where the fluid can relief out. When the fluid temperature is high, failure to do so may result in burns.

Precautions

• Install a strainer (Recommendation: 80-100 mesh or equivalent) at the valve inlet side.
• Install a safety valve at the valve outlet sides 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 inlet side as much as possible, and secure at least 3 m from the valve.
• When pressure reducing in two stages, secure at least 3 m between the valves.
• Install the valve perpendicularly to horizontal lines.

Installation Space

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

Nominal size	A (Spring type)	B
15A	310	125
20A	310	125
25A	310	135
32A	330	155
40A	330	155
50A	340	175

(Unit: mm)

Operating Procedure

Warning

• Do not touch the valve directly with bare hands. When the fluid temperature is high, doing so may result in burns.
• Before flow the steam in pipe line, make sure the fluid can flow without any dangerous at the end of pipe line and pipe line is connected tightly.

1. Close the stop valve at inlet and outlet side of the pressure reducing valve, and taking sufficient time not to blow the safety valve, blow off the fluid to remove foreign matter via the by-pass line. After blowing, close the by-pass line stop valve.
2. Slowly open the stop valve at the inlet side of the pressure reducing valve, and adjust the travel of the stop valve at the outlet side of the pressure reducing valve so that a little fluid flows.
3. Loosen the lock nut, and slowly turn the adjusting screw to achieve the desired pressure (clockwise to increase, counterclockwise to reduce) while observing the pressure gauge on the outlet side.
4. Slowly open the stop valve at the outlet of the pressure reducing valve, and readjust the desired pressure.
5. After adjustment, tighten the lock nut.

Maintenance

Warning

Completely discharge internal pressure from the valves, lines, and equipment, and cool the valve down to a level where you can touch it with bare hands before disassembly and inspection. When the fluid temperature is high, failure to do so may result in injury or burns due to residual pressure or spillage around the valve.

Consumable Parts Replacement Periods

No.	Name of parts	Replace period
5	Diaphragm	2 years
16	O ring	3 years
18, 19	Pilot valve assembly	5 years
24	Gasket	5 years
26, 27	Gasket	2 years
28	Strainer	5 years
30	Gasket	2 years

Note: Apply a liquid sealant for heat and steam resistant (Recommendation: SOLVEST 110) to the sealing surface of the diaphragm bottom and the top cover.