Abstract A valve is provided which has only two positions of adjustment. In one position, complete flow is permitted through the valve while in the other position flow through the valve is positively cut off. Such a valve is highly desirable, for example, in a pipeline feeding a highly combustible fuel to a furnace or the like. When the furnace is not in use so that the workmen enter the furnace to perform various repair operations thereon, possibly using welding torches and the like, it is an absolute necessity that no combustible fuel be admitted to the furnace proper. If the flow of fuel is controlled only by a valve capable of movement between various positions of adjustment it is possible, and, unhappily, this has happened that any fuel entering the furnace may be ignited with disastrous results.
In a line blind valve having a valve body with a passage therethrough, opposite valve seating members positioned in a spaced relation across said passage with the seats on such members each flared outwardly at an acute angle to a plane normal to said passage, a rod having a threaded portion midway of its length and also having a wedge-shaped valve member at each end thereof, one of said valve members being solid and the other having an aperture therein, such valve members each being adapted to fit snugly between said valve seating members in a seating position one to permit fluid flow through the valve body and the other to cut off any fluid flow through the valve body, each of the valve members being mounted rotatably at opposite ends of said rod, the upper end of the valve body having a threaded nut mounted thereon to receive the threaded portion on the rod to enable each of the valve members to be forced selectively into seating position between the opposite valve seating members.
Claim 2
Dependent Claim
175 words
In a line blind valve having a valve body with a passage therethrough, opposite valve seating members positioned in a spaced relation across said passage with the seats on such members each flared outwardly at an acute angle to a plane normal to said passage, a rod having a threaded portion midway of its length and also having a wedge-shaped valve member at each end thereof, one of said valve members being solid and the other having an aperture therein, such valve members each being adapted to fit snugly between said valve seating members in a seating position one to permit fluid flow through the valve body and the other to cut off any fluid flow through the valve body, each of the valve members being mounted rotatably at opposite ends of said rod, the upper end of the valve body having a threaded nut mounted thereon to receive the threaded portion on the rod to enable each of the valve members to be forced selectively into seating position between the opposite valve seating members.