초록 ▼

A pressure relief by-pass control valve in a system flowing fluid of changing temperature. The vale incorporates a signalling mechanism to indicate when differential pressures have put the valve in a by-passing mode, including an indicator button displaceable by a valve member in moving toward an op

A pressure relief by-pass control valve in a system flowing fluid of changing temperature. The vale incorporates a signalling mechanism to indicate when differential pressures have put the valve in a by-passing mode, including an indicator button displaceable by a valve member in moving toward an open position. Temperature responsive structure closes and opens a gap in the connection between the valve member and the indicator button. As used with a heat exchanger, the valve signals the fact of a clogged heat exchanger core, while obviating giving of a false signal when high pressure differentials resulting from low temperature operating conditions occur.

대표청구항 ▼

A pressure relief by-pass control valve assembly, including a valve housing providing a through passage for a flowing fluid of changing temperature and an inlet opening to said passage for by-passing fluid flow, valve means installed in said housing normally closing said inlet opening and responding

A pressure relief by-pass control valve assembly, including a valve housing providing a through passage for a flowing fluid of changing temperature and an inlet opening to said passage for by-passing fluid flow, valve means installed in said housing normally closing said inlet opening and responding to a predetermined difference in fluid pressure between said inlet opening and said through passage to move to open said inlet opening, means utilizing opening movement of said valve means to signal externally of said housing an open by-pass, said means including a lost motion connection whereby an opening movement of said valve means may be without effect on said signalling means, and means influenced by a changing temperature of the flowing fluid to enable and disable said lost motion connection.