| 摘要 |
PURPOSE:To prevent an abnormal rise in hydraulic pressure from occurring, by installing both of a relief valve having the higher setting than an ordinary relief valve and a motor operated valve operating on a pressure switch consisting in the setting pressure being still higher than the sand one, in a filter ring system for a high pressure control oil device of a steam turbine. CONSTITUTION:In a filter ring system for a high pressure control oil device consisting of a circulating pump 9, an earth filter 12, a selector valve 15, an oil tank, etc., an ordinary relief valve 7 is installed at the discharge side of the pump 9. In addition, such a relief valve 35 as having the setting pressure of 10% higher than that of the relief valve 7 and a motor operated valve 37 operating on a pressure switch 36 consisting in the setting pressure of 20% still higher than that of the valve 7 both are installed in an interconnecting passage between the selector valve 15 and a circulating tank 16. With this constitution, even when hydraulic pressure in a system abnormally rises due to an operation miss, etc., these relief valves positively operate and any damage to the system is thus prevented. |
