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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Three comparative graphs showing oil pressure versus engine revolutions for a Phantom new type relief valve.

Identifier  ExFiles\Box 66a\4\  scan0029
Date  1st July 1927 guessed
  
PHANTOM NEW TYPE RELIEF VALVE.

Graph 1:
Y-Axis Label: LBS □"
X-Axis Label: ENG. REVS.
Line Labels: MAIN, ROCKER, GEARS
BOW SPRING E.74522, E.21860 - .005"
3.5 OZS. TO CLOSE VALVE .050" CLEARANCE.
MAIN SPRING E.75748. LOW PRESS. E.75757.
OIL TEMP. 60°C WATER TEMP. 80°C

Graph 2:
Y-Axis Label: LBS □"
X-Axis Label: ENG. REVS.
Line Labels: MAIN, ROCKER, GEARS
BOW SPRING. PRODUCTION.
MAIN SPRING E.75748
LOW PRESS SPRINGS. 8 OZS.
OIL TEMP. 64°C WATER TEMP. 82°C

Graph 3:
Y-Axis Label: LBS □"
X-Axis Label: ENG. REVS.
Line Labels: MAIN, ROCKER, GEARS
BOW SPRING. PRODUCTION.
MAIN SPRING E.75748.
LOW PRESS SPRINGS E.76290
OIL TEMP. 63°C WATER TEMP 82°C
  
  


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