Spirax Sarco 25P Pilot Valve Type Pressure Reducing Valve ½" - 5"

Description

Spirax Sarco 25P Pilot Operated Pressure Reducing Valves ½" - 5" are self-acting pilot operated pressure reducing valves. The downstream pressure is sensed through an external pressure sensing tube, which regulates the main valve opening and maintains pressure stabilization. The valve can be closed when there is no load downstream. The main valve of this pressure reducing valve has a single seat, carbide spool finish, the valve body is ductile iron (or cast steel), and the pilot valve is bolted directly to the main valve.

Available Models

Available types	SKU
1/2" 25P SG Blue	6090328
3/4" 25P SG Blue	6090331
1" 25P SG Blue	6090334
1 1/4" 25P SG Blue	6090337
1 1/2" 25P SG Blue	6090340
2" 25P SG Blue	6090343
DN15 25P SG Blue	6090349
DN20 25P SG Blue	6090352
DN25 25P SG Blue	6090355
DN32 25P SG Blue	6090358
DN40 25P SG Blue	6090361
DN50 25P SG Blue	6090364
DN65 25P SG Blue	6095200
DN80 25P SG Blue	6095203
DN100 25P SG Blue	6095206
DN125 25P SG Blue	3267145
DN150 25P CI Blue	60003504
DN15 25P CS Blue	9307015005
DN20 25P CS Blue	9307020005
DN25 25P CS Blue	7307025005
DN40 25P CS Blue	9307040005
DN50 25P CS Blue	9307050005
DN65 25P CS Blue	9307065005
DN80 25P CS Blue	9307080005
DN100 25P CS Blue	9307100005
DN150 25P CS Blue	9307150006

Downstream pressure range

• Yellow spring: 0.2 bar g - 2.1 bar g
• Blue Spring: 1.4 bar g - 7.0 bar g
• Red spring: 5.6 bar g - 14.0 bar g

Sizes and pipe connections

• ½" - 2": Threaded BSPT (BS21)
• ½" - 4": Flanges PN 16, 25 (ductile iron), PN 40 (cast steel)
• 5": flange PN16, 25 (ductile iron)
• Other connection sizes on request from Spirax Sarco.

weights

caliber	Weight (cast iron) (kg)
1/2"	10.8 (thread), 11.4 (flange)
3/4"	10.2 (thread), 12.2 (flange)
1"	13.6 (threaded), 16 (flanged)
1 1/4"	16 (thread), 18.8 (flange)
1 1/2"	15.8 (threaded), 20.4 (flanged)
2"	26 (threaded), 31.2 (flange)
2 1/2"	62.4 (flange)
3"	74.6 (flange)
4"	112.2 (flange)
5"	132 (flange)

makings

Item	Part	makings
1	valve body	Ductile Iron QT400 - 18
2	bonnets	Ductile Iron QT400 - 18
3	Bonnet bolts	Steel SAEJ429 Grs
4	main spool	Stainless steel AISI 420
5	Main valve seat (1/2" - 2")	Stainless steel AISI 420
5	Main valve seat (2 1/2" - 5")	Stainless steel AISI 304
6	Main seat gasket	copper (chemistry)
7	Valve return spring	Stainless steel AISI 302
8	filter	Stainless steel AISI 304
9	tappet	Stainless steel AISI 304
10	Stem sleeve (1/2" - 2")	brass
10	Stem sleeve (2 1/2" - 5")	steel (chemistry)
11	Bonnet Gasket	Asbestos-free
12	Spring guide	Steel SAEJ995
13	Nuts (1/2" - 2")	brass
13	Nuts (2 1/2" - 5")	steel (chemistry)
14	Pressure balancing tube	Stainless steel AISI 304
15	diaphragm roof	Ductile Iron QT400 - 18
16	Valve stem bushings	Stainless steel AISI 304
17	Diaphragm Bottom Cover (1/2" - 2")	brass
17	Diaphragm Bottom Cover (2 1/2" - 5")	foundry iron
18	Top bar guide (1/2" - 2")	brass
18	Top bar guide (2 1/2" - 5")	stainless steels
19	diaphragm plate	Ductile Iron QT400 - 18
20	Diaphragm disk top bar	Stainless steel AISI 304
21	Nuts (2 1/2" - 5")	steel (chemistry)
22	Main diaphragm (1/2" - 3")	phosphor bronze
22	Main diaphragm (4" - 5")	stainless steels
23	trocar	Stainless steel AISI 304
24	Stubs and Damping Holes	12L14
25	receiver group	Stainless steel ASTM B280
26	plug	Steel 12L14
27	attachment bolt	Steel SAE1060
28	Adjustment screw (1/2" - 2")	brass
28	Adjustment screw (2 1/2" - 5")	stainless steels
43	Pilot valve spring	Copper non-asbestos
44	locknut	steel (chemistry)
45	spread litter in a cowshed, pigsty etc	Stainless steel AISI 304
46	diaphragm roof	Ductile Iron QT400 - 18
47	spring-loaded plate	Stainless Steel ASTM B283
48	Diaphragm bottom cover	Brass SAE1010
49	Pilot valve spring	Steel SAE1010
50	diaphragm plate	Ductile Iron QT400 - 18
51	distant (socially aloof)	Phosphor bronze AISI 302
60	Pilot valve gasket	Graphite/asbestos AISI 302
61	Pilot valve mounting nut	Steel SAE J 429 Grs
62	Diaphragm Chamber Nut	Steel/1 - 18x1" SAE J429 Grs

mounting

Pressure reducing valves should be installed in horizontal piping with bypass and shut-off valves, with a trap and strainer upstream of the valve and a straight section of at least 10 times the pipe diameter before and after the downstream pressure sensing pipe.

flux

caliber	Cv value
1/2"	3.4
3/4"	6.5
1"	10.5
1 1/4"	14
1 1/2"	20
2"	35
2 1/2"	56
3"	74
4"	115
5"	123

typical application

The 25P is precise and reliable, reducing steam from high pressure to the effective operating range of the equipment and preventing damage to the equipment.