Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1975-06-16
1977-02-15
Rosenthal, Arnold
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 29, 251203, 251 30, F16K 31122
Patent
active
040079066
ABSTRACT:
Main steam isolation valves are required for both PWR and BWR nuclear steam supply systems. In the event of a main steam line rupture, these valves must prevent gross loss of steam. The pressure drop across the valves is a direct factor in the efficiency of the generating plant. The rate of steam flow through the valves is high. These conditions require large port diameter valves that are reliable, can close rapidly, have low pressure drops, and are suitable for operation at specified design pressure and temperature. The valve of the present invention includes a parallel seat, fully revolving, double disc gate valve and fully satisfies the above requirements. The valve of the present invention embodies a valve operating mechanism which is fully enclosed within the primary pressure containment of the valve. This precludes any part of the operator being damaged by missiles resulting from other system failures. The energy source for the operator is the steam in the pipeline itself, providing assurance that any time energy is needed to close the valve, it is available and, should the steam pressure fail, the valve will close by itself. Another energy source, in the form of an independent pressure system, is also included which may move the valve operator to open or close the valve or to "exercise" the valve. Solenoid actuated control valves selectively provide the mode of operation while electrical switches detect the position of the valve operator.
REFERENCES:
patent: 607265 (1898-07-01), McLean
patent: 2707483 (1955-05-01), Shafer
patent: 2859010 (1958-11-01), Ferrell
patent: 3379404 (1968-04-01), Anderson
Anchor/Darling Valve Company
Rosenthal Arnold
LandOfFree
Main steam isolation valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Main steam isolation valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Main steam isolation valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1434387