Gas Pressure Regulator R 51 Product information © 01.2023

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Table of Contents Application, Characteristics, Technical Data 4 Application 4 Characteristics 4 Types of models / Options 4 Gas Pressure Regulator 4 Technical data 5 Structure and function 6 Sectional view 7 KG* value and diaphragm assemblies 8 Diaphragm assembly setpoint spring table 8 Dimensions, Connection, and Weight 9 Dimensions and weight 9 Dimensional drawing 9 Connection of the measuring lines and breather lines 9 Types of Models / Options 10 Design 11 Calculation of the required KG value 11 Checking the gas velocities 11 Properties of Gases 12 Order Data 12 Contact 13 Observe the following...

Application, Characteristics, Technical Data Application Gas pressure regulator (GDR), direct-acting (operating without auxiliary power), for systems acc. to DVGW work sheet G 491 (A) and G 600 (A) (TRGI) Particularly suitable for dynamic regulation sections (e.g. natural gas supply systems, low flow regulators, burner circuits, gas motor operation). Can be used as an equipment component on gas consumption facilities as defined in Regulation (EU) 2016/426. Can be used for the gases defined in DVGW work sheet G 260 / G 262 and neutral non-aggressive gases. (other gases on request) Characteristics...

Technical data Type Max. inlet pressure pu,max Nominal width Connection type (ASME flanges on request) Material Housing / actuator housing DIN EN ISO 12944-2 without additional coatings an epoxy resin coating is recommended (see page 7) Temperature range, Class 2 (operating/ambient temperature) Closing pressure zone group Function, strength and tightness CE mark acc. to PED/ PIN number CE-0085-CR0137 Ex protection The mechanical parts of the device do not have any potential ignition sources of their own and therefore do not fall within the scope of ATEX 95 (94/9/EC). Electrical components fitted...

Structure and function The spring-loaded gas pressure regulator R51 has the function of keeping the outlet pressure of a gaseous medium constant within allowable limit values, independently of the effect of interferences, such as changes in the inlet pressure and/or in the gas tap, in the connected regulation section on the outlet side. The gas pressure regulator is composed of the actuator housing and the "diaphragm assembly plus actuator" functional unit. The valve seat model is pre-pressure-compensated. The gas flows through the actuator housing in the direction of the arrow. The internal...

Sectional view Diaphragm assembly Adjusting screw Internal measurement port Main diaphragm Actuator housing

KG* value and diaphragm assemblies Nominal width Flow rate coefficient KG* [m³/ (h*bar)] Diaphragm assembly Diaphragm assembly setpoint spring table *) Spring data d = 0.64 (ρn = 0.83 kg/m³, tu = 15° C) and external measurement port. With an internal measuring line, the maximum AC flow rate is limited to 100 ³/h. with high-pressure spring plate (HD1) with high-pressure screw spindle

Dimensions, Connection, and Weight Dimensions and weight Nominal width DN Dimensional drawing Example: R51/025/160 with HD2 Weight (regulator + HD2): 3.6kg + 0.4kg = 4kg Dimensions (A + HD2): 178mm + 112mm = 290mm Dismounting dimensions for springs / HD2 Connection of the measuring lines and breather lines Nominal width Diaphragm assembly External measurement line Breather line Connection* for: tube 10 x 1.5 (thread G 1/4) Connection* for: tube 10 x 1.5 (thread G 1/4) *) Threaded pipe connections to DIN EN ISO 8434-1 (DIN 2353) 9

Types of Models / Options BV breather valve The BV breather valve is used to secure the installation room against inadmissible escape of gas from diaphragm comparator compartments of safety shut-off valves. In case of a defect, the impermissible escape of gas into the surrounding atmosphere is limited to a maximum of 30l/h (air). It also serves as a substitute for an expensive and complex installation of breather lines. (Option not available for hydrogen version H2) RSD2 throttle valve The RSD2 is a throttle valve which regulates the volume flow in the sensing/impulse line by means of a continuously...

Design Note All calculated pressures are absolute pressures for natural gas. (p+1 bar) The required KG value for a gas pressure regulator is determined with the smallest inlet pressure or lowest pressure drop. Calculation of the required KG value pd / pu > 0.5 Value flow rate coefficient KG at a subcritical pressure ratio KG = Qn / pd⋅(pu-pd) Example: pd / pu ≤ 0.5 Value flow rate coefficient KG at a supercritical pressure ratio KG = 2∙Qn / pu Device selection pu Inlet pressure (bar) pd Outlet pressure (bar) Qn Standard volumetric flow rate (m³/h) For spring-loaded devices, a capacity reserve...

for natural gas (ρn = 0.83 kg/m³; t = 15°C) f - natural gas conversion factor- L Gas f Hs,n Gas f Hs,n [kWh/m³] [kWh/m³] Acetylene 0.84 16.25 Sewage gas 0.84 Ammonia 1.04 4.83 Carbon monoxide 0.81 3.51 Butane 0.55 37.23 Carbon dioxide 0.65 Chlorine 0.51 - Air 0.80 Landfill gas approx. 0.80 Methane 1.08 11.06 Natural gas L 1.00 9.77 Propane 0.64 28.03 Natural gas H 1.03 11.45 Oxygen 0.76 Ethane 0.78 19.55 Sulphur dioxide 0.53 Ethylene 0.97 16.516 Nitrogen 0.81 Mine gas (30% CH4) 0.86 Hydrogen 3.04 13.43 Helium 2.15 - Order Data Example: Order selection Type R51 DN - Nominal width RE - Diaphragm...

Contact Management ALEXANDER CHRISTIANI Technical Inside Sales Department MINDAUGAS PECKAITIS Phone: Mail: Head of Sales & Marketing FRANZ FEICHTNER Inside Sales Department SEBASTIAN HUCKESTEIN Head of Inside Sales Department MANUEL SCHEPP Inside Sales Department STEFANIE MÜLLER If you want to know more about solutions from MEDENUS for the gas industry, please contact your local contact person or go to our internet site at www.medenus.de Trade representation worldwide medenus.de/de/kontakt.html Gas-Druckregeltechnik GmbH Im Langen Feld 3 D-57462 Olpe Phone: +49 (0)2761 82788-0 Fax: +49 (0)2761...