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Safety Relief Valve RMG 846

Technical Description

846.00 edition 12/2004

Reliable and accurate

gas pressure regulation and metering

GB

Safety Relief Valve RMG 846 Application • as leakage relief valve (SBV) in gas pressure regulating stations • for natural gas and all non-corrosive gaseous media

Advantages • simple design and easy mainteneance • can be mounted in any position • safe operation • high respose accuracy

1. Technical Data

2

max. permissible pressure PS

20 bar (ANSI 150)

setting ranges (Wa)

Wa (bar) 0,2 ,,, 0,5 0,4 ... 1,5 1,0 ... 2,5 2,0 ... 4,0 3,0 ... 7,0

valve seat diameter

7 mm

connections

inlet: G 1/2 a (male thread) outlet: G1/2 i (female thread)

venting of spring chamber

internal venting through discharge line

materials

main valve spring housing diaphragm setpoint spring

weight

0,5 kg

ambient temperature class II

-20°C to +60°C

function and strength

acc. to EN 334

setpoint spring no.

F1 F2 F2 F3 F4

forged aluminium alloy forged aluminium alloy NBR stainless steel

Safety Relief Valve RMG 846 2. Dimensions in mm

95

G 1/2

G 1/2

Ă˜ 50

3

Safety Relief Valve RMG 846 3. Design and Operation The safety relief valve RMG 846 was designed to automatically relieve a gas stream of surplus pressure, as soon as the pressure prevailing in the system to be protected rises up to the pre-set response pressure limit. The closes again after the pressure in the line has fallen to the closing point.

The RMG 846 is used as a leakage relief valve. It is installed downstream of the gas pressure regulator in order to prevent the shut-off valve (SSV) - in its function as a main safety device - from unintended release (i.e. the gas pressure regulator gives no tight shut-off on zero flow).

The pressure prevailing in the system to be monitored is fed to the lower side of the diaphragm through the measuring impulse line, whereas the force of the setpoint spring maintains on the upper side of the diaphragm. If the pressure to be monitored rises up to the pre-set response pressure limit, the diaphragm and the diaphragm plate are pushed upwards from the valve seat, so that the gas can flow into the discharge line.

If the pressure falls below the response pressure limit, the relief valve will close completely tight again as soon as the pressure is lowered to on the closing pressure level. The spring chamber is connected with the discharge line through a bore, so that the installation of a separate vent line is not necessary.

4

Safety Relief Valve RMG 846

"closed" position

"open" position

discharge line setpoint adjuster setpoint spring

diaphragm plate diaphragm

valve seat measuring line

5

Safety Relief Valve RMG 846

6

Safety Relief Valve RMG 846 4. Type Description (Example)

RMG 846

-

G1/2a / G1/2 i

-

F1

type inlet connection outlet connection setpoint spring

7

We supply you with products for gas pressure regulation: RMG REGEL + MESSTECHNIK GMBH Osterholzstrasse 45, D-34123 Kassel, Germany Telephone (++49) 561 5007-0 • Fax (++49) 561 5007-107 gas pressure regulators and safety devices

RMG-GASELAN Regel + Meßtechnik GmbH Julius-Pintsch-Ring 3, D-15517 Fürstenwalde, Germany Telephone (++49) 3361 356-60 • Fax (++49) 3361 356-836 gas pressure regulating equipment, displacement meters, complete stations

Bryan Donkin RMG Gas Controls Ltd. Enterprise Drive, Holmewood, Chesterfield S42 5UZ, England Telephone (++44) 1246 501-501 • Fax (++44) 1246 501-500 gas pressure regulating equipment, below ground gas control modules

Bryan Donkin RMG Co. of Canada Ltd. 50 Clarke Street South, Woodstock, Ontario N4S 7Y5, Canada Telephone (++1) 519 5398531 • Fax (++1) 519 5373339 domestic regulators and safety devices

The other RMG Companies: RMG Messtechnik GmbH Otto-Hahn-Strasse 5, D-35510 Butzbach, Germany Telephone (++49) 6033 897-0 • Fax (++49) 6033 897-130 turbine meters, vortex meters, correctors, flow computers, odorizers

Karl Wieser GmbH Anzinger Strasse 14, D-85560 Ebersberg, Germany Telephone (++49) 8092 2097-0 • Fax (++49) 8092 2097-10

works Beindersheim Heinrich-Lanz-Strasse 9, D-67259 Beindersheim/Pfalz, Germany Telephone (++49) 6233 3762-0 • Fax (++49) 6233 3762-40 data logging, monitor systems, danger alarm systems

WÄGA Wärme-Gastechnik GmbH Osterholzstrasse 45, D-34123 Kassel, Germany Telephone (++49) 561 5007-0 • Fax (++49) 561 5007-207 design and assembly of gas pressure regulating and metering stations

ZUG GAZOMET Sp. z o.o. ul. Sarnowska 2, 63-900 Rawicz, Poland Telephone (++48) 65 546 24 01 • Fax (++48) 65 546 24 08 ball valves, accessories, gas pressure regulating and meterign stations

The RMG Group of Companies on the internet: http://www.rmg.de

Serving the Gas Industry - WORLDWIDE

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