Readily demountable fill valve

Valve apparatus adapted to be fixed to an adaptor to provide a valve assembly for controlling liquid flow into a reservoir, the adaptor having a liquid inlet passage therein and a valve seating face, the apparatus including:

• a valve body having an outlet opening for directing liquid into the reservoir and an inlet opening, the valve body being configured to be demountably fixed to the adaptor;
• a pressure-responsive member received in the valve body, the pressure-responsive member being movable in response to variations in a control pressure in a control chamber on a first side of the pressure responsive member with which the liquid inlet passage communicates opposite a second side of the pressure responsive member also in communication with the liquid inlet passage, the pressure-responsive member having a valve surface for sealing against the valve seating face of the adaptor to stop flow of liquid from the inlet passage into the outlet opening;
• biasing means acting on the pressure-responsive member such that liquid pressure acting on the first side of the pressure-responsive member acts together with the biasing means to force the valve surface toward the valve seating face of the adaptor;
• and
• retaining means for retaining the biasing means and pressure-responsive member together as a unit, the retaining means including:
• a retainer for abutting an end of the biasing means, a pin having a first end fixed to the retainer, the pin extending through the biasing means and being received to slide in an aperture in the pressure-responsive member, and a stop for preventing the biasing means from pulling a second end of the pin through the aperture in the pressure-responsive member;
• wherein the valve body, the pressure-responsive member, and the biasing means are arranged such that they are demountable from the adaptor as a unit, and
• wherein one of a latch flange and cooperating latch tabs are fixed to the valve body for engagement respectively with latch tabs or a latch flange provided on the adaptor, the flange and a mating one of the tabs defining inter-engaging lock surfaces, the lock surfaces being urged toward one another by the biasing means acting to hold the valve surface against the seating face.