25P-TI-3-016-US~1.pdf

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Pi lo t O pe ra te d Pr es su re

Local regulation may restrict the use of this product below the conditions quoted. Limiting conditions refer to standard connections only.

In the interests of development and improvement of the product, we reserve the right to change the specification.

Downstream Pressure Ranges For the following downstream pressures, three color-coded pilot valve springs are available:

Yellow: 3 to 30 psi Blue: 20 to 100 psi Red: 80 to 250 psi

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Pi lo t O pe ra te d Pr es su re Pilot Operated Pressure Regulator 6" 25P

The 25P is a self-actuated pilot-operated pressure regulator.

Downstream pressure is fed back through an external sens-ing line to the pressure pilot, which adjusts the opening of the main valve so as to maintain the set pressure. The valve meets Class IV shut-off specifications but is not suitable for dead-end service.

Model 25P

Sizes 6"

Connections ANSI 125, 250 ANSI 150,300

Construction Cast Iron Cast Steel

Options Reduce Orifice Designated by

"S"

A1

D

C

¼" NPT

sensing line connections

B

E

Typical Applications The 25P is a reliable, accurate regulator to reduce steam from a high supply pressure to the most efficient operating pressure of the equipment, and to protect the equipment from dangerously high pressures.

Capacities For selection and sizing data, see TI-3-030-US

Sample Specification The pressure regulator shall be of the pilot-actuated dia-phragm operated type. The main valve shall be single-seated with hardened stainless steel trim; the regulator body shall be cast iron. The pilot shall be externally mounted to the regula-tor body.

Dimensions (nominal) in inches and millimeters

ANSI 125/150 ANSI 250/300

Size A1 A1 B C D E Weight

6" 18.1 18.9 19.75 14.9 17.1 32.1 595 lb 460 481 502 380 435 815 270 kg

TI-3-016-US 7.18

Cast Steel

The product should not be used in shaded area.

The product should not be used in shaded area.

Pressure psig (barg)

T em p er at ur e ˚F

T em p er at ur e ˚C

50 150

(7)

0 200 (14)

250 300 (20)

ANSI 150

Steam saturation curve

A N

S I 3

Cv Values Size 6" 6" "S"

Cv value 280 156

260500

Limiting Operating Conditions Cast Iron

Pressure psig (barg)

T em p er at ur e ˚F

T em p er at ur e ˚C

50 150

(7)

(14)

250 300 (20)

ANSI 125 A

N

S I 2

Steam saturation curve

450 232

Note: Maximum temperature for Stainless Steel tubing is 600˚F

Spirax Sarco, Inc., 1150 Northpoint Blvd., Blythewood, SC 29016 • Phone: (803) 714-2000 • Fax: (803) 714-2222

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Pi lo t O pe ra te d Pr es su re

R eg ul at or s

Pi lo t O pe ra te d Pr es su re

Pilot Operated Pressure Regulator 6" 25P

TI-3-016-US 7.18

Installation The regulator should be installed in a horizontal line with suitable bypass and isolating valves. A steam trap should be installed upstream to prevent condensate from reaching the regulator. The trap and regulator should both be protected with a strainer separator set. The pressure sensing line should be located in a straight section of the downstream piping at least 10 pipe diameters from the nearest fitting.

Complete installation instructions are given in IM-3-000-US.

Maintenance Complete maintenance instructions are given in IM-3-000-US and ADVP 3029, a copy of which is supplied with each regulator. Available spare parts are shown on TI-1-1121-US and TI-3-0271-US.

No. Part Material 1 Valve Body Cast Iron ASTM A 126 CL B Cast Steel ASTM A 216 WC B 2 Cover Cast Iron ASTM A 126 CL B Cast Steel ASTM A 216 WC B 3 Cover Bolts Steel AISI 1038 4 Main Valve Head Stainless Steel ASTM A 743 CA 40 5 Main Valve Seat Stainless Steel ASTM A 743 CA 40 7 Valve Return Spring Stainless Steel AISI 302 8 Valve Stem Stainless Steel AISI 304 10 Cover Gasket Graphite BS 2815 A 11 Stem Bushing Brass ASTM B16 12 Lower Diaphragm Case Cast Iron ASTM A 126 CL B Cast Steel ASTM A 216 WC B 13 Diaphragm Plate Stainless Steel ASTM A 743 CA 40 14 Main Diaphragm (2 ply) Stainless Steel AISI 301 15 Tube & Orifice Brass ASTM B16 16 Tubing Assembly Copper ASTM B280 (122) 17 Diaphragm Gasket (2) Graphite BS 2815 A 43 Adjustment Screw Stainless Steel AISI 304 44 Jam Nut Brass ASTM B16 45 Pilot Valve Spring Steel AISI 1060 46 Upper Diaphragm Case Cast Iron ASTM A 126 CL B Cast Steel ASTM A 216 WC B

No. Part Material 47 Lower Diaphragm Case Cast Iron ASTM A 126 CL B Cast Steel ASTM A 216 WC B 48 Spring Plate Steel ASTM A569 49 Diaphragm Stainless Steel ASTM A240 50 Diaphragm Plate Brass ASTM B36 51 Head & Seat Assembly Stainless Steel AISI 440 Stainless Steel AISI 440F 54 Diaphragm Case Screws Steel 5/16" - 18 x 1" ASTM A449 60 Pilot Gasket Graphite

Construction Materials

S p ir ax S ar co

, I nc

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