Leaking or broken pipes or hoses may only result in flooding but can, if
the escaping fluids are flammable, water-polluting or toxic, have
catastrophic consequences. For this reason pipe break isolating valves
are fitted on the inlet side of such systems. These valves are set to a
certain flow volume and shut off reliably and without delay as soon as
this flow volume is exceeded.
RS 219 is a piston-controlled spring-loaded pipe break isolating valve.
Depending on the medium the valve cone can be fitted with a soft or
When the pipeline is depressurised the valve is open. Under operating
conditions the small pressure drop caused by the pipe break isolating
valve acts on the piston/spring system. If the flow volume increases
beyond the set value, an imbalance is introduced between the pressure
acting on the piston and the force of the spring causing the cone to
close. The resulting increase in the flow resistance reinforces the closing
force of the piston and causes the complete shutoff of the pipe section.
The closing or shutoff speed may be adjustable. Once the fault has been
removed the valve can be re-opened and re-activated by pushing the
button on the pilot valve. Rotating the adjusting screw clockwise
increases the shutoff trigger volume. In special cases an adjustable
shutoff delay may be fitted.
These valves are no shut-off elements ensuring a tight closing of the
valve. In accordance with DIN EN 60534-4 and/or ANSI FCI 70-2 they
may feature a leakage rate in closed position in compliance with the
leakage classes III or V:
- Leakage class III (metal sealing cone) = 0.1 % Kvs value
- Leakage class V (soft seal cone) = 1.8 x 10-5 x ?p x D* [l/h]
Operating instructions, know how and safety instructions must be
observed. All the pressure has always been indicated as overpressure.
We reserve the right to alter technical specifications without notice.