EFV MRS Series Manual Reset Adjustable Excess Flow Valve

EFV MRS series: manual reset for maximum control

The EFV MRS excess flow valve is specifically designed for situations where safety protocols require an operator to physically check the system after an incident. Because the valve does not reopen automatically, you prevent media from flowing unintentionally before the cause of the excess flow, such as a faulty regulator or burst fitting, has been fixed. You can also accurately adjust the switch point in the field for optimal protection.

Why choose the MRS version?

The EFV MRS excess flow valve offers a unique combination of precision and physical safeguarding. Engineers frequently use this valve because of the following advantages:

• Physical reset: the unit only reopens when an operator operates the built-in balancing valve.
• Bubble-tight shut-off: the piston forms a gas-tight seal as soon as it touches the seat.
• Field-adjustable: you can easily change the actuation point externally by turning the adjusting screw.
• Safety with toxic media: ideal for gas distribution systems where leakage poses an immediate hazard.
• Optional signalling: fit the valve with a reed switch for direct notification to your central control room.

How does the manual reset work?

The operating principle of the EFV MRS excess flow valve combines magnetic force with a manual bypass system:

1. Detection: at excessive flow, the pressure difference overcomes the magnetic attraction, after which the piston blocks the outlet.
2. Complete stop: unlike "controlled bleed" models, this valve shuts off the flow completely.
3. Pressure equalisation: to reopen the valve, the operator turns the handle of the balancing valve on the side.
4. Reset: this lets medium flow from the inlet side to the outlet side until the pressure is equal. The piston then returns to the active position by magnetic repulsion, after which the operator closes the balancing valve again.

Technical specifications EFV MRS series

Toepassingen in High-Risk Omgevingen

The EFV MRS excess flow valve is the standard in sectors where uncontrolled outflow leads to standstill or danger:

• Gas distribution systems: safe shut-off in case of rupture of central lines.
• Toxic gas analysers: prevents the escape of hazardous substances in case of instrument failure.
• Plant lines: protection of plant installations against sudden pressure loss.
• Regulator & fitting protection: immediate intervention in case of mechanical failure of system components.

Looking for a model that resets automatically after pressure equalisation? Then look at our standard EFV series. For help choosing the right material for aggressive media, contact our specialists directly or consult the ChemTec documentation.