Fushiman P260 Pressure Reducing Valves (Valve Box Stainless Steel Casting: Oil-Prohibited Finish)

Manufacturer: Fushiman Co.,LTD.
Model: P260

Model	Nominal Diameter (mm)	Primary Side Pressure	Secondary Side Set Range	Maximum Operating Temperature	Body Material	Connection
P260	15〜250	MAX. 3.0MPa	0.03～2.5MPa	300°C	FC,FCD,SCPH,SCS	Flange

● The nominal diameter ranges widely from 15 to 250.
● Stable operation is ensured even under high or low differential pressure.
● All performance values are based on experimental data.
● If the primary pressure on the inlet side of the pressure-reducing valve fluctuates due to being controlled by a check valve or flow control valve, or if the pressure-reducing valve is used in series in a two-stage pressure reduction system, please use the P260-DHC model (page 10) for the second stage.

Specifications and Materials

Fluid	Pressure (MPa)		Maximum Operating Tempera-ture (°C)	Detection Method	Main Component Materials					Pipe Connec-tion
Fluid	Primary Side	Secondary Side Setting Range	Maximum Operating Tempera-ture (°C)	Detection Method	Valve Box	Main Valve Body & Seat	Piston & Cylinder	Pilot Valve Body & Seat	Diaph-ragm	Pipe Connec-tion
Steam	0.1 – 1.0	0.03 – 0.2 0.1 – 0.8 0.5 – 0.9	220	Internal or External	Cast Iron	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Flange JIS 10K Full Face
	0.1 – 1.6	0.03 – 0.2 0.1 – 0.8 0.5 – 1.44	220		Cast Iron	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Flange JIS 16K Full Face
	0.1 – 2.0	0.03 – 0.2 0.1 – 0.8 0.5 – 1.6	220		Ductile Cast Iron	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Flange JIS 20K Flat Face
	0.1 – 1.0	0.03 – 0.2 0.1 – 0.8 0.5 – 0.9	260		Cast Steel	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Flange JIS 10K Flat Face
	0.1 – 1.0	0.03 – 0.2 0.1 – 0.8 0.5 – 0.9	300		Cast Steel	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Flange JIS 10K Flat Face
	0.1 – 1.6	0.03 – 0.2 0.1 – 0.8 0.5 – 1.44	260		Cast Steel	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Flange JIS 16K Flat Face
	0.1 – 1.6	0.03 – 0.2 0.1 – 0.8 0.5 – 1.44	300		Cast Steel	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Flange JIS 16K Flat Face
	0.1 – 2.0	0.03 – 0.2 0.1 – 0.8 0.5 – 1.6(2)	260		Cast Steel	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Flange JIS 20K Flat Face
	0.1 – 2.0	0.03 – 0.2 0.1 – 0.8 0.5 – 1.6(2)	300		Cast Steel	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Flange JIS 20K Flat Face
	0.2 – 3.0	0.1 – 0.8 0.5 – 1.6 1.0 – 2.5	240		Cast Steel	Stainless Steel + Stellite Weld Overlay	Stainless Steel	Stainless Steel + Stellite Weld Overlay	Stainless Steel	Flange JIS 30K Flat Face
	0.1 – 1.0	0.03 – 0.2 0.1 – 0.8 0.5 – 0.9	184		Stainless Steel Cast Steel	Stainless Steel	Stainless Steel	Stainless Steel	Stainless Steel	Flange JIS 10K Full Face

Notes:
(1) Valve boxes with a nominal diameter of 15 to 40 are made of ductile cast iron.
(2) Manufactured up to 1.8 MPa.
(3) Optional. For installation areas of seismic piping, please refer to separate technical documents.

Remarks:

For a nominal diameter of 200, the maximum primary pressure is 1.6 MPa. For a nominal diameter of 250, the maximum is 1.0 MPa.
ASME Class 150 and 300 versions are also available.

Performance

Maximum Pressure Reduction Ratio			20 :1
Minimum Set Differential Pressure			10% of Primary Side Pressure (Minimum Value: 0.07 MPa)
Offset	Set Pressure Range (MPa)	0.03 – 0.2, 0.1 – 0.8	0.03 MPa or less
Offset	Set Pressure Range (MPa)	0.5 – 0.9 (1.44) (1.6)	0.05 MPa or less
Shutoff Pressure Rise	Set Pressure Range (MPa)	0.03 – 0.2, 0.1 – 0.8	0.02 MPa or less
Shutoff Pressure Rise	Set Pressure Range (MPa)	0.5 – 0.9 (1.44) (1.6)	0.04 MPa or less
Minimum Adjustable Flow Rate			5% of Rated Flow Rate
Valve Seat Leakage			0.05% or less of Rated Flow Rate

Structure and Dimensions

Notes:

The diagram shows the state when the flow rate is zero (valve fully closed).
The diagram represents an internal detection type.
Handles are not included in cast bronze products.
For nominal diameters of 200 and above, as well as for JIS 30K applications, some shapes may differ.

Dimensions

(mm)

Valve Body Material	Nominal Diameter /Dimensions		15	20	25	32	40	50	65	80	100	125	150	200	250
Cast Iron	L	JIS10K	145	150	160	175	190	210	235	265	310	360	400	490	620
	L	JIS16K	145	150	160	175	190	210	235	270	315	365	405	500	—
	H₁		78	73	71	77	85	95	112	123	150	174	202	248	300
	H₂		171	176	178	188	198	212	231	248	305	337	367	482	549
	K		115	115	115	115	111	111	111	111	162	162	162	194	194
Ductile Cast Iron	L	JIS20K	149	154	164	179	194	206	231	266	—	—	—	—	—
	H₁		82	77	75	79	85	95	110	121	—	—	—	—	—
	H₂		171	176	178	188	198	212	231	248	—	—	—	—	—
	K		115	115	115	115	111	111	111	111	—	—	—	—	—
Cast Steel	L	JIS10K	182	186	186	206	212	228	252	270	318	358	398	496	630
		JIS16K	182	186	186	206	212	228	252	274	326	362	402	504	638
		JIS20K	186	190	190	210	216	232	256	278	330	370	410	512	650
		JIS30K	194	194	195	218	224	240	268	290	—	—	—	——	—
	H₁		77	77	75	77	85	95	110	124	151	175	207	248	303
	H₂		177	177	179	189	199	213	232	249	305	337	367	482	552
	K		107	107	107	107	103	103	103	103	147	147	147	194	194
Stainless Steel / Cast Steel	L	JIS10K	182	186	186	206	212	228	252	270	318	358	398	——	—
	H₁		75	75	75	85	85	95	110	124	151	175	207	——	—
	H₂		179	179	179	198	198	212	231	248	305	337	367	—	—
	K		117	117	117	113	113	113	113	113	162	162	162	——	—

Notes:

K indicates the dimensions when the adjustment spring is free.
H₁, H₂, and K values for JIS 30K may differ slightly.

Mass

(kg)

Nominal Diameter	15	20	25	32	40	50	65	80	100	125	150	200	250
Cast Iron JIS10K	8	8.5	10	12	14	18	26	32	51	71	105	195	315
Ductile Cast Iron JIS20K	9	9.5	11	13	15	19	27	35	—	—	—	—	—
Cast Steel JIS20K	10	11	13	14	17	22	30	39	60	92	131	228(4)	341(5)
Cast Steel JIS30K	12	13	15	16	20	24	35	43	—	—	—	—	—
Stainless Steel Cast Steel JIS10K	9	10	12	15	16	21	28	35	55	86	124	—	—

Notes:

(4) Mass of JIS 16K
(5) Mass of JIS 10K

Piping Example

Please install it vertically on a horizontal pipe.
Maintenance space as shown in the table below is required for the pressure reducing valve.

Disassembly & Maintenance Required Space (mm)

Nominal Diameter	15	20	25	32	40	50	65	80	100	125	150	200	250
Distance Below Pipe Center (mm)	200	200	200	200	220	250	270	300	350	410	460	560	700

Nominal Diameter Selection for Alarm Safety Relief Valve

The table below shows the nominal diameter of the alarm safety relief valve used on the secondary side of a P260 type pressure reducing valve (for steam: 1.0 MPa, 220°C or below).

P260 Type Pressure Reducing Valve Specifications		Safety Relief Valve Blowout Pressure (MPa)	P260 Type Pressure Reducing Valve – Nominal Diameter
Primary Side Pressure (MPa)	Set Pressure (MPa)	Safety Relief Valve Blowout Pressure (MPa)	15	20		25	32	40	50	65	80	100	125	150	200	250
0.3 or less	0.03	0.08	15-20	15	20	15-20	15-20	15-20	25	32	40	40G65 65	40G65 65	40H80 80	50J80	80K100
More than 0.3 and up to 0.6 or less	0.03	0.08	15-20	15	20	15-20	15-20	25	32	40	50	40G65 65	40H80 80	50J80	80K100	80L100
0.6 or less	0.05	0.1	15-20	15	20	15-20	15-20	25	32	40	50	40G65 65	40H80	50J80	80K100	80L100
More than 0.6 and up to 1.0 or less	0.05	0.1	15-20	15	20	15-20	15-20	25	40	50	65	40G65 80	40H80	50J80	80K100	80L100
0.7 or less	0.1	0.15	15-20	15	20	15-20	15-20	25	32	40	50	40G65 65	40H80 80	50J80	80K100	80L100
More than 0.7 and up to 1.0 or less	0.1	0.15	15-20	15	20	15-20	25	32	40	50	65	40G65 80	40H80	50J80	80L100	100M150
0.7 or less	0.2	0.28	15-20	15	20	15-20	15-20	15-20	25	32	40	40G65 65	40G65 65	40H80 80	50J80	80K100
More than 0.7 and up to 1.0 or less	0.2	0.28	15-20	15	20	15-20	15-20	25	32	40	50	40G65 65	40G65 80	40H80	50J80	80L100
0.9 or less	0.3	0.38	15-20	15	20	15-20	15-20	15-20	25	32	40	40G65 65	40G65 65	40H80 80	50J80	80K100
More than 0.9 and up to 1.0 or less	0.3	0.38	15-20	15	20	15-20	15-20	15-20	32	32	40	40G65 65	40G65 80	40G80 80	50J80	80K100
1.0 or less	0.4	0.48	15-20	15	20	15-20	15-20	15-20	25	32	40	40G65 50	40G65 65	40G65 80	50J80	80K100
1.0 or less	0.5	0.6	15-20	15	20	15-20	15-20	15-20	25	32	40	25E50 50	40G65 65	40G65 80	40H80	50J80
1.0 or less	0.6	0.7	15-20	15	20	15-20	15-20	15-20	15-20	25	32	25E50 40	40G65 65	40G65 65	40H80	50J80
1.0 or less	0.7	0.82	15-20	15	20	15-20	15-20	15-20	15-20	25	32	25E50 40	25E50 50	40G65 65	40G65 80	40H80
1.0 or less	0.8	0.92	15-20	15	20	15-20	15-20	15*20	15-20	15-20	25	25E50 32	25E50 40	40G65 50	40G65 80	40H80

Notes:

The table shows the nominal diameter of the alarm safety relief valve for failures such as overpressure in the P260 type pressure reducing valve (for steam). It has no relation to legal regulations.
For P260 type nominal diameters 15 to 80, the values indicate the nominal diameter of the RPF12 type safety relief valve. For P260 type nominal diameters 100 to 250, the upper row shows RPN6B type safety relief valve, and the lower row shows RPF12 type safety relief valve nominal diameters.
If the set pressure of the P260 type pressure reducing valve (for steam) falls between two values in the table, choose the nominal diameter corresponding to the smaller set pressure.
The relief capacity of the safety relief valve is approximately 5-10% of the rated flow of the reducing valve. The blowout pressure is indicated in the table below.
- If the set pressure is 0.5 MPa or higher, for 0.5 – 1.6 MPa (medium pressure) applications, add 0.02 MPa to the values in the table.

Alarm Safety Relief Valve Blowout Pressure

(MPa)

Set Pressure of Pressure Reducing Valve	Blowout Pressure of Safety Relief Valve
0.1 MPa or less	Set Pressure of Pressure Reducing Valve + 0.05 MPa or more
More than 0.1 MPa and up to 0.4 MPa	Set Pressure of Pressure Reducing Valve + 0.08 MPa or more
More than 0.4 MPa and up to 0.6 MPa	Set Pressure of Pressure Reducing Valve + 0.1 MPa or more
More than 0.6 MPa and up to 0.8 MPa	Set Pressure of Pressure Reducing Valve + 0.12 MPa or more
More than 0.8 MPa	Set Pressure of Pressure Reducing Valve + 15%

5. If the primary side pressure of the pressure reducing valve exceeds 1.0 MPa, or if the steam temperature exceeds 220°C, the required blowout amount of the safety relief valve should be calculated accordingly.

Please refer to the blowout capacity tables for RPF12 type, RPF13 type, or RPN6B type saturated steam to determine the appropriate nominal diameter for the safety relief valve.

Fushiman Co.

Specifications and Materials

Performance

Structure and Dimensions

Dimensions

Mass

Piping Example

Nominal Diameter Selection for Alarm Safety Relief Valve

Notes:

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