[ valves ]
LNG
Liquefaction plants ( LNG trains )
LNG carriers
Receiving terminals & Regasification plants
Special process applications utilizing Velan valves down to -272 ° C
Butterfly valves
-160 ° C -256 ° F 113K
AEROSPACE FACILITIES -254 ° C -425 ° F
Rocket launch pads ( LOx , LH2 ) 19 K
Rocket engine test benches ( LOx , LH2 ) Transonic wind tunnels
RESEARCH LABS Particle accelerators : CERN LHC
Super conducting magnets
-272 ° C -457 ° F
Nuclear fusion : Tokamak , ITER 1.2 K
Velan provides two different designs of butterfly valve : double- and triple-offset metal seated valves . Both designs provide bi-directional flow capabilities . They are designed with disc rotation geometries to ensure tight shut-off sealing . Trapped cavities are eliminated .
In the double offset , an exceptionally tight shut-off is achieved with eccentric disc rotation combined with a unique sealing system , VELFLEX . This patent technology overcomes even high temperature fluctuations .
The triple-offset disc rotation geometry , TORQSEAL , ensures that the disc seal contacts the body seat only at the final shut-off position without rubbing or galling , providing a torque-generated resilient seat with sufficient wedging effect to ensure a uniform seal contact around the entire circumference of the valve seat when the valve is closed . The resiliency of the seal allows selfadjusting of the valve body and disc to prevent the risk of jamming during temperature transients .
A reinforced stainless-steel shaft is furnished for high cycles and smooth operation at very low temperature .
The VELFLEX double offset valve design allows for easy and quick in-line maintenance . Thanks to the side cover , free access to the seat and disc for inspection or maintenance is possible without disassembly of actuators , and no special tools are required .
Control valves
Velan has a quite unique portfolio of control valves for low-temperature applications designed for temperatures down to -272 ° C and working pressures up to PN70 .
The valves used are bellows seal globe control valves , with angle and / or straight patterns . Proprietary design features and material are developed for reliable and safe operation . Valves can be fitted with a tight double shell or jacket enabling vacuum insulation . Valves are manually or pneumatically operated , depending on the onsite applications .
Safety relief valves
The safety relief valves are specially designed for overpressure protection of liquefied helium lines in superconductivity applications . This is achieved by a magnetic safety device developed specifically to protect containers and pressure shells against overpressure of compressed fluids at ambient temperature or during a very low temperature discharge . In the event of a local temperature increase , called ‘ quench ’, the valve opens in less than 80 ms . Initially supplied for liquefied helium , it can be adapted to hydrogen applications .
Qualification and approval
Tests are performed in accordance with the most stringent customer requirements . Protection against explosion is required in conformance with ATEX , KOSHA , NAMUR standards as per the applicable legislations . Some customers require local certifications , such as KGS in Korea , or NK in Japan .
28 Hydrogen Tech World | Issue 9 | April 2023