Growth of Vacuum Systems' Business in Japan (for materials processing)

2009 ◽  
Vol 52 (10) ◽  
pp. 537-540
Author(s):  
Chikara HAYASHI
Keyword(s):  
Materials Processing ◽  
Vacuum Systems

A SYSTEM FOR PROTECTING AN OIL DIFFUSION PUMP AGAINST FAILURE OF THE MECHANICAL FORE PUMP, COOLING WATER, OR ELECTRICITY

1970 ◽  
Vol 28 ◽  
pp. 344-345
Author(s):  
W. C. Bigelow ◽  
F. B. Drogosz ◽  
S. Nitschke
Keyword(s):  
High Vacuum ◽  
Cooling Water ◽  
Effective Protection ◽  
Pump Line ◽  
Diffusion Pump ◽  
System Pressure ◽  
Control Relay ◽  
Vacuum Systems ◽  
Vacuum Gage ◽  
Pressure Switch

High vacuum systems with oil diffusion pumps usually have a pressure switch to protect against Insufficient cooling water; however, If left unattended for long periods of time, failure of the mechanical fore pump can occur with equally serious results. The device shown schematically in Fig. 1 has been found to give effective protection against both these failures, yet it is inexpensive and relatively simple to build and operate.With this system, pressure in the fore pump line is measured by thermocouple vacuum gage TVG (CVC G.TC-004) whose output is monitored by meter relay MRy (Weston 1092 Sensitrol) which is set to close if the pressure rises above about 0.2 torr. This energizes control relay CRy (Potter & Brumfield KA5Y 120VAC SPDT) cutting off power to solenoid-operated fore line valve Vf (Cenco 94280-4 Norm. Closed) which closes to prevent further leakage of air into the diffusion pump

CHANG-LIN TIEN'S CONTRIBUTIONS TO LASER MATERIALS PROCESSING

2005 ◽  
Vol 14 (14) ◽  
pp. 411-418
Author(s):  
T. Qiu ◽  
Jon P. Longtin ◽  
L. M. Phinney
Keyword(s):  
Materials Processing ◽  
Laser Materials ◽  
Laser Materials Processing
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