Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1978-10-10
1980-03-18
Weakley, Harold W.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251196, F16K 2500
Patent
active
041935772
ABSTRACT:
An improved spring plate (52) for insuring timely cooperation between the gate member (36) and segment member (38) of a linearly reciprocating gate assembly (34) which is expansible to seal the opposed seats of a gate valve. The two members have two pairs of interfacing wedge surfaces which should be in full contact when the assembly is traveling between the extremities of its stroke. Only at the ends of such stroke, as determined by a stop which halts movement of the segment member, should wedging and transverse expansion take place.
The spring plate (52) has the general shape of an inverted "T" plus a pair of curved spring fingers (60, 62) extending from the free top end of the upright leg (54) toward the opposite ends of the assembly. The base legs (56,58) of the inverted "T" pass under the two pins (72, 74) in the gate member, which are located at equal distances from the mid-length of the gate member. Each spring finger curves toward the end of the assembly and downwardly toward the base legs, but terminates short of them with a free end. As the plate is installed, these free ends are flexed so that they contact and are held by the gate pins, the tangent through the contact point being approximately normal to the direction of movement of the assembly.
REFERENCES:
patent: 2954960 (1960-10-01), Dunbar
patent: 3823911 (1974-07-01), Natho
ACF Industries Incorporated
Riddle Eugene N.
Weakley Harold W.
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