Dome valve adjustable top plate

A kit of parts for a valve comprising:

• a valve upper plate defining an inlet, the valve upper plate housing a resilient sealing ring and the valve upper plate being attached onto a valve body defining an outlet;
• a closure member disposed in a fluid passage between the inlet and the outlet, the closure member having a convex sealing surface,
• wherein the valve upper plate has openings arranged in a circular pattern with fasteners inserted therein to attach the valve upper plate to the valve body, and the valve plate having further openings with a plurality of movable adjustors inserted therein,
• wherein the plurality of adjustors are movable to adjust a size of a circumferential gap between the convex sealing surface and the sealing ring, and
• wherein to adjust or define the size of the circumferential gap, the at least two movable adjustors are rotated such that the at least two movable adjustors protrude out from the valve upper plate and onto the valve body in a direction towards the outlet by varying distances to displace the valve upper plate relative to the valve body.

A valve comprising:

• a valve upper plate having an inlet;
• a valve body having an outlet;
• a fluid passage extending between the inlet and the outlet;
• a closure member disposed in the fluid passage between the inlet and the outlet, the closure member having a convex sealing surface, and the closure member being rotatable between a closed position in which the closure member extends across the fluid passage with the convex sealing surface oriented towards the inlet and an open position in which fluid is able to flow through the fluid passage from the inlet to the outlet;
• a resilient sealing ring attached to the valve upper plate and extending around the fluid passage, and, when the closure member is in the closed position, the sealing ring is moveable between a first configuration in which the sealing ring forms a seal around a circumference of the convex sealing surface and a second configuration in which there is a circumferential gap between the convex sealing surface and the sealing ring;
• and
• at least two movable adjustors, wherein the at least two movable adjustors are movable to adjust or define a size of the circumferential gap between the convex sealing surface and the sealing ring,
• wherein to adjust or define the size of the circumferential gap, the at least two movable adjustors are rotated such that the at least two movable adjustors protrude out from the valve upper plate and onto the valve body in a direction towards the outlet by varying distances to displace the valve upper plate relative to the valve body.