Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to regulate or vary operation of device
Patent
1975-03-03
1978-01-03
Pendegrass, Verlin R.
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to regulate or vary operation of device
137458, 176 60, G21C 900
Patent
active
040664988
ABSTRACT:
A pressurized water nuclear reactor having a safety vessel containing a steam generator from which a live steam line extends, a shut-off and safety device includes valve means having a displaceable valve member connected in the live steam line within the safety vessel, and control piston means connected to the valve member for controlling opening and closing of the valve means, the control piston means comprising a control cylinder and a control member displaceable in the control cylinder and having a pair of opposite sides having working surfaces respectively subjectible to differences of pressure applied thereto in respective portions of the control cylinder located adjacent thereto for displacing the control member in respective directions so as to displace the valve member in corresponding directions to open and close the valve means, the portions of the control cylinder located adjacent the sides of the control member having means for effecting a pressure difference between the respective cylinder portions, means for changing the pressure difference so as to close the valve means in response to occurrence of a leak in the live steam line, and means for limiting the pressure difference to a value dependent upon the highest permissible pressure in the steam generator, the valve member being displaceable by the highest permissible pressure in the steam generator to open the valve means.
REFERENCES:
patent: 2912997 (1959-11-01), Griswold
patent: 3529630 (1970-09-01), Podolsky
patent: 3734134 (1973-05-01), Vogeli
patent: 3842858 (1974-10-01), Bobo
Hoffmann Jurgen
Hofmockel Albrecht
Lepie Gunther
Kraftwerk Union Aktiengesellschaft
Lerner Herbert L.
Palo Ralph
Pendegrass Verlin R.
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