TI-D340-02BR Rev. 01

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In the interests of development and improvement of the product, we reserve the right to change the specification. © Copyright 2019

DescriptionSV561H is a full nozzle, high capacity Safety Valve, designed with flat seat and metal / metal seal. Its modern design with two adjustment rings, allows the precise adjustment of the differential pressure (blowdown). It is suitable for use in boilers.

Available TypesSV561H valves are available wih NPT threaded connections according to ASME B1.20.1 Standard and test lever.

Construction StandardThe SV561H Safety Valves are designed and manufactured according ASME Code, Section I requirements. The building materials comply with ASME Code, Section I PG 73.3, and seat tightness complies with requirements of PG-73.5.3 of this code.

CertificationsA manufacturers' Typical Test Report is provided as standard for each valve which will include material certification, valve set and hydraulic test pressure in accordance with EN 10204 2.2.

MaterialsSee pages 2 for details.

Dimensions & WeightSee pages 2 for details.

Capacity TableSee pages 2 for details.

SV561HSafety Valve

Set Pressure Maximum 20,7 bar g Minimium 1,0 bar gTemperature Maximum 232ºC Minimum 120ºC Maximum backpressure 2,1 bar g

How to orderFor the correct sizing and selection of the SV561H, the following information is necessary:1) Required capacity (flow):2) Operation pressure and Set pressureSpirax Sarco has a computer sizing program (PSV Calc) which performs sizing and selection functions. Additionally, it will select materials, configure the complete valve and provide a data sheet.

Limiting Conditions

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TI-D340-02SV561H Safety Valve

Steam Capacity - 3% Overpressure - kg/h

For sizing purpose using the ASME actual areas, the certified coefficient of discharge Kd for air, gas and steam is 0.859. lb/h = kg/h x 2,2046

D E F G H J

0,810 1,453 2,405 3,464 5,425 8,8641,0 79 141 234 337 527 8611,5 97 174 288 415 650 10622,0 115 207 342 493 772 12622,5 134 240 397 571 895 14623,0 152 273 451 650 1017 16623,5 170 305 505 728 1140 18634,0 189 338 560 806 1263 20634,5 207 371 614 884 1385 22635,0 226 405 670 965 1511 24685,5 244 438 726 1045 1637 26756,0 263 472 782 1126 1763 28816,5 282 506 838 1206 1889 30877,0 301 540 894 1287 2016 32937,5 320 574 950 1368 2142 35008,0 339 607 1005 1448 2268 37068,5 357 641 1061 1529 2394 39129,0 376 675 1117 1609 2521 41189,5 395 709 1173 1690 2647 432510 414 743 1229 1771 2773 453112 489 878 1453 2093 3278 535614 565 1013 1677 2416 3783 618116 640 1148 1901 2738 4288 700618 716 1284 2125 3060 4793 783120 791 1419 2349 3383 5298 8656

20,7 817 1466 2427 3496 5475 8945

lb/h=Kg/h/0.4536

coeficientededescargaKd paravaporé0.859Paraodimensionamentoutilizando-seasáreasatuais(ASME),o

PressãodeAbertura(barg)

DesignaçãodoOrifício/ÁreaAtual(cm²)

TabeladeCapacidade-Vapord'água-3%Sobrepressão-Kg/h

Standard Materials Nº Part Materials 01 Body (Base) Stainless Steel T 316 08 Lower Ring Stainless Steel T 316 04 Lower Lock Screw Brass - 05 Upper Lock Screw Brass - 09 Disc Stainless Steel T 316 10 Upper Ring Stainless Steel T 316 17 Stem Terminal (Orifíces F /G/ H e J) Brass 18 Stem Retainer Brass 19 Stem Brass - 20 Spring Support Brass 21 Spring 120 a 201 °C Carbon Steel 21 Spring 202 a 232 °C Stainless Steel T 302 22 Bonnet ASTM A 126 Cl B - 24 Pressure Screw Brass 25 Lock Nut Carbon Steel 27 Lifter Nut Brass 28 Nut Carbon Steel 29 Bonnet Carbon Steel 30 Bonnet Screw Blackened Carbon Steel 33 Lever Carbon Steel 39 Lever Pin Brass 40 Name Plate Stainless Steel T 316 41 Seal Wire Lead

SetPressure

(barg)

Orifice / Flow Area (cm²)

Dimensions and Weights approximate in mm and kg NPTM x NPTF threaded connections

ConnectionsOrifice

Effective Areacm ²

DimensionsWeight

Inlet Outlet A B C

½" ¾" D 0,810 56,0 37,0 175,3 0,9

¾" 1" E 1,453 63,4 40,0 199,5 1,2

1" 1.¼" F 2,405 70,0 49,0 227,8 1,9

1.¼" 1.½" G 3,464 83,0 57,5 252,5 3,4

1.½" 2" H 5,425 85,0 67,0 289,5 4,5

2" 2.½" J 8,864 100,4 86,0 327,0 7,6