product leaflet RS250/251
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Gas Pressure Regulator RS 250 / RS 251 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 Technical data 5 Structure and function 6 Installation example 6 Sectional view 7 KG* value and diaphragm assemblies 8 RE - Diaphragm assembly 8 Diaphragm assembly setpoint spring table 9 SSV setpoint spring table - control device 10 Dimensions, Connection, and Weight 12 Dimensional drawing 12 Dimensions and weight 12 Types of Models / Options 13 Design 15 Calculation of the required KG value 15 Device selection 15 Checking the gas velocities 15 Properties of Gases 16...

Application, Characteristics, Technical Data Application Gas pressure regulator (GDR), direct-acting (operating without auxiliary power), for systems acc. to DVGW work sheets G 491 (A) and G 600 (A) (TRGI) Particularly suitable for dynamic regulation sections (e.g. gas fireplaces, gas pressure regulating systems of gas distributors, industrial plants, 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 sheets G 260 / G 262 and neutral non-aggressive...

Technical data Type Nominal width Connection type DIN EN 1092 flanges PN 16 / ASME - B16.5 flanges Class 150 RF Material Housing / actuator housing/ Control device housing Corrosivity category C1 up to and including C5-I C5-M DIN EN ISO 12944-2 without additional coating an epoxy resin coating is recommended (see page13) Temperature range, Class 2 (operating/ambient temperature) Closing pressure zone group Function, strength, and tightness CE mark to PED/ PIN number Ex-protection Preferred installation position When used according to the designated use, the mechanical equipment does not...

Structure and function The spring-loaded gas pressure regulator RS 250 / 251 has the function of keeping the outlet pressure of a gaseous medium constant within allowable limit values (AC), 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” and “SSV”. The actuator housing can be provided with different valve seat diameters per nominal width. The gas pressure regulators are...

Sectional view Adjusting screw Diaphragm assembly Setpoint spring Main diaphragm Measurement line port Actuator housing Bypass valve Valve seat Closing spring Measurement line port SSV Safety shut-off valve (SSV)

KG value and diaphragm assemblies (KG value for natural gas: d = 0.64 (ρn = 0.83 kg/m³), tu = 15° C) Nominal width Diaphragm assembly Ø Valve seat Ø 17.5 mm Connection type RE - Diaphragm assembly Regulator type Diaphragm assembly Standard / outlet pressure ranges [mbar] Outlet pressure range with high-pressure spindle HDS [mbar] (illustration with HDS on p. 12)

Diaphragm assembly setpoint spring table Spring data Spring no. Specific command range Wds [mbar] RE 275 * High-pressure spindle HDS required (illustration p. 12) Spring data Spring no. Specific command range Wds [mbar] RE 385-2 * High-pressure spindle HDS required (illustration p. 12)

SSV setpoint spring table - control device RS 250: DN 25 - 100 / RSP 251: DN 50 - 80 small ball lock ND to Wds o 200mbar Spring data Feder Nr. Lower response pressure Upper response pressure Δpwu [mbar] Δpwo ** [mbar] Lower response pressure Upper response pressure Δpwu [mbar] RS 250: DN 25 - 100 / RSP 251: DN 50 - 80 small ball lock MD-R to Wds o 3500mbar Spring data Farbe Feder Nr. [RAL] Lower response pressure Δpwu [mbar] Upper response pressure Δpwo ** [mbar] Lower response pressure Δpwu [mbar] Upper response pressure

RS 250: DN 150 - 200 / RS 251: DN 100 large ball lock ND to Wds o 200mbar Spring data Farbe Feder Nr. [RAL] FM 400 Lower response pressure Upper response pressure Δpwu [mbar] Δpwo [mbar] Lower response pressure Upper response pressure Δpwu [mbar] Δpwo [mbar] RS 250: DN 150 - 200 / RS 251: DN 100 large ball lock MD-R bis Wds o 3500mbar Spring data Feder Nr. Lower response pressure Δpwu [mbar] Upper response pressure Δpwo [mbar] Lower response pressure Δpwu [mbar] Upper response pressure Δpwo [mbar] Standard spring If the control device is set up for simultaneous monitoring of upper and lower...

Dimensions, Connection, and Weight Dimensional drawing Safety diaphragm Dismounting dimensions for springs / HDS Reactivation / setting SSV RS 250 Nominal width SM safety diaphragm weight 275 [kg] 330 Example: R250/050/330 with HDS and safety diaphragm Weight (regulator + HDS + SM): 15 kg + 0.6 kg + 3 kg = 18.6 kg Dimensions (A + HDS + SM): 346 mm + 125 mm + 32.5 mm = 503.5 mm

Types of models / Options Safety diaphragm Safety diaphragm In the model with safety diaphragm, the safety diaphragm is located above the main diaphragm. When the main diaphragm is damaged, the safety diaphragm makes contact with the top cover of the diaphragm assembly and limits any inadmissible escape of gas into the surrounding atmosphere to a maximum of 30l/h (air). (Option not available for hydrogen version H2) BV breather valve The BV breather valve is used as for securing the installation room against inadmissible escape of gas from diaphragm comparator compartments of safety...

Reed contact / inductive transmitter Reed contacts and inductive transmitters are used to monitor the position (closed or open position) of the safety shut-off valve via remote display. Reed contact SSV manual and remote release The direct-acting safety solenoid valve is used as electromagnetic remote release for closing the safety shut-off valve when power is applied or in case of power failure. Epoxy resin coating in RAL colors To protect the gas pressure regulator from external influences, starting from a corrosivity category C5-M we recommend an epoxy resin coating. Types of models...