Page 1

Vent Valve RMG 915

General Description

915.00 Edition 03/2001

Your competent partner

serving the gas industry - WORLDWIDE

Vent Valve RMG 915 Application • to protect indoor stations from gas leakages out of diaphragm chambers, can replace installation of venting lines • for the vent line connections at the diaphragm assemblies, pilots, and measuring units of the following valves: RMG 265, RMG 268, RMG 610, RMG 402, RMG 409 (only up to pe = 25 bar) RMG 300, RMG 320, RMG 330 (for regulating lines of slow reaction only) RMG 322, RMG 332, RMG 408

Characteristics • approved by DIN-DVGW • can limit gas leakages resulting from diaphragm deficiency to the max. permissible standard value of 30 l/h (air) • easy installation by screwing valve into vent bore

1. Technical data max. permissible service pressure pzul

25 bar

max. permissible gas leakage qn

30 l/h (air)


G 1/2 or M 16x1.5


body diaphragm

ambient temperature

-15 °C ... +60 °C

aluminium rubber-like plastic material (NBR)

2. Dimensions in mm 42

30 44

G 1/2 or M 16 x 1.5



Vent Valve RMG 915 3. Design and operation

valve seat body spring valve sealing restrictor bore

The standards DIN 3380 and DIN 3381 for gas pressure regulators and safety devices impose the obligation to limit gas leakages resulting from diaphragm deficiencies to a max. permissible value of 30 l/h. The vent valve RMG 915 was designed in order to meet this requirement, so that the installation of vent lines is not necessary. The vent valve consists of body, a diaphragm, and a spring and functions like a flow-regulator. In the non-working position the valve sealing connected to the diaphragm is lifted from the valve seat by the force of the spring, thus creating an open passage-way through the control element and the restrictor bore in the diaphragm to the chamber to be vented. Any gas leakages due to normal stroke movements of the valve or resulting from a diaphragm deficiency will cause a differential pressure at the restrictor bore moving the valve sealing towards the valve seat to initiate the flow control process. The diaphragm surface, restrictor bore and spring force are sized and adjusted to one another so as to make sure that the maximum permissible leakage limit cannot exceed a flow of 30 l/h. Quickly succeeding stroking movements may lead to a short pressure increase in the chamber to be vented. The venting effect, however, remains uninterrupted. In the eventuality of a diaphragm deficiency causing a pressure increase of more than 0.5 bar, the vent valve will close and remain closed.

operational diagram

air leakage rate qn in l/h


standard flow limitation

reaction under normal valve stroke movements

reaction upon diaphragm deficiency > 30 l/h

pressure in diaphragm chamber p (bar)


We supply you with products for gas pressure regulation: RMG REGEL + MESSTECHNIK GMBH Osterholzstraße 45, 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 3,15517 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 regulators, safety devices, electronic control systems

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

other companies of the RMG Group RMG Messtechnik GmbH Otto-Hahn-Straße 5, 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, 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, 34123 Kassel, Germany Telephone (++49) 561 5007-0 • Fax (++49) 561 5007-207 design and assembly of gas pressure regulating and metering stations

Die RMG Group of Companies on the internet:

Your competent partner

serving the gas industry - WORLDWIDE

We reserve the right for technical changes

Read more
Read more
Similar to
Popular now
Just for you