Dome valve adjustable top plate

The valve according to claim 7, wherein the valve upper plate is attached to the intermediate plate with the plurality of upper plate fasteners, and the intermediate plate is attached to the valve body with a plurality of valve body fasteners.

A method of adjusting a circumferential gap between a convex sealing surface and a resilient inflatable sealing ring of a valve, the valve comprising a valve upper plate defining an inlet, a valve body defining an outlet, and a fluid passage extending between the inlet and the outlet, a closure member having a convex sealing surface disposed in the fluid passage, a resilient sealing ring attached to the valve upper plate extending around the fluid passage, and, when the closure member is in the closed position, the resilient 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 the valve comprises a circumferential gap between the convex sealing surface and the sealing ring, and a plurality of movable adjustors, wherein the plurality of movable adjustors are capable of adjusting and/or defining the size of the circumferential gap between the convex sealing surface and the sealing ring, the method comprising:

• measuring the circumferential gap between the convex sealing surface and the sealing ring to obtain a measurement of the circumferential gap;
• and
• moving the plurality of adjustors to displace the valve upper plate from the valve body thereby adjusting the size of the circumferential gap.