Watts 252A User Manual
For Steam, Liquid or Air Applications
ES-252A
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Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Series 252A
Stainless Steel
Strainer Screen
Replaceable
Stainless Steel
Seat and Valve
Disc.**
Stainless Steel
Disc and Stem
Guide (This
stainless steel
trim is standardly furnished at
no extra cost)
Laminated Metal
Diaphragm
Adjusting Springs
for reduced pressure
ranges between 3
and 140 psi (.21 and
9.8 bars)
Series 252A
Process Steam Pressure
Regulators
Sizes 1⁄
2" –
3
⁄
4" (15 - 20mm)
Series 252A Process Steam Pressure Regulators are designed to
offer highly sensitive response to reduced pressure changes and
maintain fullest possible volume without appreciable reduced
pressure drop. These regulators are ideal for use on applications
such as oil lines, testing fixtures, autoclaves, steam tables, steam
irons, single radiators, vulcanizers, sterilizers and process lines.
The series 252A features a sensitivity adjuster to eliminate any
vibrating condition that may arise from critical flow requirements.
Features
• Bronze body construction
• Serviceable in line
• Standard sensitivity adjuster
Models
252A – Bronze body for pressures up to 300psi (21 bars)
252AT – Tight seating for dead end and liquid service. Utilizes
Teflon
®
valve disc, maximum operating temperatures are 300°F
(204°C) at 300psi (21 bars) and 400°F (204°C) at 200psi (14 bars)
For information on
1
⁄2
" – 1" stainless steel construction, see literature
ES-152SS.
Specifications
Valve shall be manufactured out of bronze and have a maximum
working pressure of up to 300psi. Valve shall feature a sensitivity
adjuster to eliminate vibrating conditions. Valves shall be serviceable
in line and have stainless steel trim and strainer. Valve shall be a
Watts Regulator Company Series 252A.
Materials
Body: Bronze
Trim: Stainless Steel
Strainer: Stainless Steel
Diaphragm: Laminated Metal
Seat: Replaceable Stainless Steel
Disc: Replaceable Stainless Steel
Pressure – Temperature
252A Maximum Working Pressure: 300psi (21 bars)
252AT – Maximum Temperature: 300°F (149°C)
Maximum Working Pressure: 300psi (21 bars), and
Maximum Temperature: 400°F (204°C)
Maximum Working Pressure: 200psi (14 bars)
** When utilizing a Teflon®valve disc in the 252AT, the maximum
operating temperatures are 300°F at 300psi (149°C at 21 bars)
and 400°F at 200psi (204°C at 14 bars).
A Plus Feature
Sensitivity Adjuster
Basic Design Feature
Teflon®is a registered tradename of E.I. duPont deNemours Co., Inc.
ES-252A 0403 © Watts Regulator Co., 2004 Printed in U.S.A.
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.wattsreg.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
A
D
C
Flow
Flow
Pressure Drop
Pressure Drop
Series 252A
Adjusting Spring Range Chart
SIZE *ADJUSTABLE RANGES SPRING AND MODEL NO.
in. mm psi bars
1
⁄
2
15 3 – 15 .21 – 1.05 145
1
⁄
2
15 10 – 50 .70 – 3.51 146
1
⁄
2
15 30 – 140 2.11 – 9.84 141
3
⁄
4
20 3 – 15 .21 – 1.05 145
3
⁄
4
20 10 – 50 .70 – 3.51 146
3
⁄
4
20 30 – 140 2.11 – 9.84 141
*The minimum reduced pressure ranges shown are recommended
only when very sensitive regulation service is needed for specific
requirements. However, all valves may be adjusted below the working
range minimums shown for lower regulation or complete shut off.
SIZE (DN) DIMENSIONS WEIGHT
AC D
in. mm in. mm in. mm in. mm lbs. kg.
1
⁄215 6 152 7 178 115⁄1649 11 4.99
3
⁄
4
20 6 152 7 178 1
15
⁄
16
49 11 4.99
bars psi
1.4 20
1.0 15
0.7 10
0.3 5
00
24681012 gpm
7.6 15.2 22.8 30.4 38 45.6 lpm
bars psi
1.4 20
1.0 15
0.7 10
0.3 5
00
5101520253035gpm
19 38 57 76 95 114 133 lpm
Quick Reference Capacity Chart For Average Conditions
From From From From From From From From From
psi bar psi bar psi bar psi bar psi bar psi bar psi bar psi bar psi bar
Initial Pressure 50 3.52 75 5.27 100 7.03 125 8.79 150 10.55 175 12.3 200 14.06 225 15.82 250 17.58
Up To Up To Up To Up To Up To Up To Up To Up To Up To
Reduced Pressure 20 1.41 35 2.46 50 3.52 60 4.22 70 4.92 80 5.62 90 6.33 100 7.03 125 8.79
in. mm *Maximum Capacities in Lbs. of Steam Per Hour
252A
1
⁄
2
"1580111 143 175 205 237 270 299 332
252A
3
⁄4"20285 394 506 620 726 841 956 1060 1178
*1 Lb. Steam Equals 970 BTU Per Hour
252A Size 1⁄2" (15mm)
252A Size 3⁄4" (20mm)
Range 30 - 140
Range 10 - 50
Range 3 - 15
Range 30 - 140
Range 10 - 50
Range 3 - 15
Dimensions — Weights
Capacity
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