Application Areas for
Fully-Welded Ball Valves
Oil, gas and product pipelines
Compressors, measuring and control stations
Gas storage facilities
Plants for the oil, gas and petrochemical industries
Liquefied gas
On/offshore platforms
Ship construction
Power stations
District heating/steam
Pig trap stations
Special applications
Fully-Welded Ball Valves
RAV fully-welded ball valves guarantee maximum reliability and, based-on experience, a very long service life.
The ball valves are extremely reliable, absolutely maintenance-free and are particularly suited for applications in
enclosed pipeline systems.
RAV ball valves meet all of the important approval guidelines and standards!
In general, RAV ball valves are manufactured for extreme requirements – as series product, as special series as well as
special productions at the customer’s request.
Construction Characteristics
Fully welded housing
Trunnion mounted ball
Spring-loaded seat rings
Metallic or soft seals
”Double Block and Bleed”-version
Full or reduced bore
Flanged, welded or threaded connections
Blow-out proof shaft
Shaft seals replaceable under full
pressure in open and closed position
No static charging
Maintenance-free bearings
Optional
Injection of a sealant for emergency sealing
Shaft extension
Pipe extensions for drainage, venting and
emergency sealing
Special coatings
Ball valves for underground installation
Bypass directly on the ball valve
Locking
We will be pleased to send you other designs and the detailed design properties on request!
Special Requirements
Gases and Dangerous Liquids
Fully-welded RAV ball valves for the transportation of gases and hazardous liquids are component-tested by RWTÜV: with the
right selection of suitable materials for housing, ball and seals, they are deployed for all media in these application ranges.
Fire-Safe Ball Valves
In emergencies, RAV fire-safe ball valves guarantee reliable function even at temperatures above
+650 °C.
The emergency seal of these ball valves is provided by their special design and the use of special materials.
The special sealing systems
Sealing systems in the channel
Fully-welded RAV ball valves from a nominal diameter of DN 25 are equipped, as a standard,
with spring-supported seat rings which ensure a tight seal even at the lowest pipeline pressures. The contact pressure of the
seals is supported by the sealing ring design from the pipeline pressure and increases in proportion to the operating pressure.
Depending on the application optionally various sealing systems are available:
Soft seal
Primary metallic seal – secondary soft seal
Purely metallic seal
Double Block and Bleed
The pressure release of the cavity is achieved by means of a venting joint. By means of the seat ring on the
upstream and the downstream sides, the tight seal of the cavity is ensured both for the open and the closed valve.
Therefore is it possible to test the tightness of the ball valve for the cavity under operating pressure.
Self-Venting Seat Ring
If a non-permitted overpressure occurs in the cavity, the seat ring design effects
automatic release into the pipeline.
Double-Acting Seat Ring System
In this design, successive seat rings seal on the upstream and the downstream side. The cavity is not released
automatically. By pressurising the cavity, proof of tightness in the open and the closed position can be obtained.
