Page 41 - ITAtube Journal 2/2019

Technical Papers
results in both reduced wear and in the valve being blow-out proof.
The modular design allows many con guration options for the high-pressure valves in terms of function, material choice, type of connection and application area, explains Göpfert AG. In addition to shut-off valves, examples include control valves, non-return valves, strainers, valves for panel mount- ing, valves with cutting ring t- tings or with welding ends, and valves with an external spindle thread. “As well as traditional hand wheel operation, our high-pressure valves can also be tted with actu- ators for use as automated valves,” the company states.
The tightness is also important, Bürkert adds. The pre-controlled valve with servo piston and two way pre-control has an additional radial seal and “enables very good tightness”, according to the company. The high pressure design covers pressures up to 250 bar.
Fossil and nuclear power generation
Schroeder Valves is active as a manufacturer of high-pressure valves in the areas of fossil and nuclear power generation, as well as descaling in steelmaking. The company’s high pressure range starts at the PN250, or class 1500 lbs, pressure rating. In classic (minimal owvalve)applications, this corresponds to operating pressures from approximately 140 bar, and goes up to approximately 400 bar. There are even applica- tion areas for high-pressure valves with operating pressures of several 1000 bars. The materials typically used in Schroeder Valves’ applica- tion areas are hardened martensi- tic steels.
“For minimal ow valves, the classic application is in the boiler feed water areas in fossil fuel and nuclear power plants, where to increase ef ciency, the water is rst brought to a high pres- sure before it is vaporised by the addition of heat and discharged through a turbine,” owner Axel Mücher explains. Other elds of application are the descaling of rolled metal in steelmaking, which involves using a high pressure water jet to blast the unwanted scale layers off the steel, and water injection, whereby high pressure water is injected into an oil or gas eld to increase the pressure inside the well and thus increase the ow rate.
Weight reduction as a target
Particular situations require special measures: high pressures cause very high forces on the walls of the pressurised parts of a valve, which in itself requires a thick construction. “The amount of material used and weight reduction therefore play a role for purely cost-based reasons,” says Mücher. Therefore, in terms of the geometrical design, one tries to enclose the pressurised volume in the most ef cient and materi- al-saving way.
One must also remember that valves must be integrated into pipelines, where their weight sometimes causes high operating forces, which must be borne by appropriate supporting structures. Mücher continues: “Any possible material-ef cient design is also in the interests of the user here.”
Users therefore pay close atten- tion to quality, costs and criteria such as weight reduction. Manu- facturers of high-pressure valves who do not want to come under pressure themselves must prepare for this. Then your business can run at full speed. Innovations in the elds of valves and associated products will be presented at the world`s no 1 fair for industrial valves, VALVE WORLD EXPO, from December, 1-3, 2020 at Düsseldorf Fairgrounds.
Messe Düsseldorf GmbH
Messeplatz 40474 Düsseldorf Gernany
Petra Hartmann-Bresgen, M.A.
Tel.: +49 (0)211 4560 541 Fax: +49 (0)211 4560 87 541
HartmannP@ messe-duesseldorf.de www.messe-duesseldorf.com
ITAtube Journal No2/May 2019
41