초록 ▼

A valve is disclosed for venting and relieving pressure within a blister in a built-up, multiple layer roof structure, which includes a hollow shaft having one open end adapted to be inserted into the blister and the other end covered by an air permeable, water impermeable membrane protected by a ho

A valve is disclosed for venting and relieving pressure within a blister in a built-up, multiple layer roof structure, which includes a hollow shaft having one open end adapted to be inserted into the blister and the other end covered by an air permeable, water impermeable membrane protected by a housing. The exterior of the shaft is threaded to permit penetration into the blister and holding of the valve. Air is vented through the membrane and out a passage provided in the housing.

대표청구항 ▼

An apparatus comprising: a roof structure having a top and a bottom layer and at least one intermediate layer between said top and bottom layers; a housing having an interior chamber in fluid communication with the exterior of said housing via a fluid passage; an open-ended hollow shaft having a fir

An apparatus comprising: a roof structure having a top and a bottom layer and at least one intermediate layer between said top and bottom layers; a housing having an interior chamber in fluid communication with the exterior of said housing via a fluid passage; an open-ended hollow shaft having a first portion disposed in said housing in fluid communication with said chamber, and a second portion extending from said housing communicating with said intermediate layer of said roof structure; and a membrane disposed over the open end of said first portion of the shaft to separate said shaft end from said chamber, said membrane being gas permeable and liquid impermeable to permit passage of gases across said membrane and preclude passage of liquid across said membrane, thereby allowing gases to be vented from said intermediate layer of said roof structure without allowing liquid to penetrate into said intermediate layer of said roof structure.