Roll seal control valve
First Claim
1. In a diaphragm control valve, including:
- a) a housing having an inlet, an outlet, and a passageway for the flow of liquid from the inlet to the outlet, the passageway surrounded by a valve seat having a seat sealing surface;
b) a valve member including a diaphragm within the housing, the diaphragm displaceable towards or away from said valve seat to control the flow therethrough;
c) the housing further including a rigid cover between the outlet and passageway, a control chamber is formed between the cover and the diaphragm, and the cover attached to the housing by slotted grillwork surrounding the valve seat;
d) the diaphragm includes an outer flexible peripheral section secured to the cover and in alignment with said valve seat, a valve-closure section having a valve sealing surface surrounding a center area, the valve-closure section displaceable with respect to the valve seat for controlling the flow therethrough, e) the valve sealing surface contacting the seat sealing surface when the valve member is fully closed; and
f) a pilot valve fluidly connected to the control chamber;
an improvement comprising;
g) a liquid passageway across the sealing surfaces when the valve is fully closed, h) the slotted grillwork includes vanes, each vane having a diaphragm side and a downstream side and each vane extends from the valve seat to the housing thus forming a slot between adjacent vanes, i) said diaphragm pressed against the diaphragm side of the vanes when fully closed, j) said liquid passageway having a width less than the width of two slots, k) a closure at the vane downstream side of all slots having access to said liquid passageway, l) an opening in each closure, and m) a check valve over the opening.
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Accused Products
Abstract
A water system uses a pressure reservoir of an extremely small size. A valve device is placed between a water pump and the pressure reservoir. The valve device has a constant outlet pressure to limit the flow from the pump at high pressures. The pump is turned on and off by a pressure on/off switch. The valve device maintains the pressure to the reservoir at or below the on switch pressure except for a trickle flow. The trickle flow fills the reservoir when there is little or no water usage from the reservoir. The trickle flow is achieved by a notch in the valve surfaces of the valve device or by a projection preventing the surfaces to seal. Each time the valve opens any debris in the notch is washed from the notch thereby keeping the notch free of debris. Back flow of the trickle is prevented with a roll seal valve by restricting the trickle to a flow path and incorporating a check valve in the flow path.
30 Citations
5 Claims
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1. In a diaphragm control valve, including:
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a) a housing having an inlet, an outlet, and a passageway for the flow of liquid from the inlet to the outlet, the passageway surrounded by a valve seat having a seat sealing surface;
b) a valve member including a diaphragm within the housing, the diaphragm displaceable towards or away from said valve seat to control the flow therethrough;
c) the housing further including a rigid cover between the outlet and passageway, a control chamber is formed between the cover and the diaphragm, and the cover attached to the housing by slotted grillwork surrounding the valve seat;
d) the diaphragm includes an outer flexible peripheral section secured to the cover and in alignment with said valve seat, a valve-closure section having a valve sealing surface surrounding a center area, the valve-closure section displaceable with respect to the valve seat for controlling the flow therethrough, e) the valve sealing surface contacting the seat sealing surface when the valve member is fully closed; and
f) a pilot valve fluidly connected to the control chamber;
an improvement comprising;
g) a liquid passageway across the sealing surfaces when the valve is fully closed, h) the slotted grillwork includes vanes, each vane having a diaphragm side and a downstream side and each vane extends from the valve seat to the housing thus forming a slot between adjacent vanes, i) said diaphragm pressed against the diaphragm side of the vanes when fully closed, j) said liquid passageway having a width less than the width of two slots, k) a closure at the vane downstream side of all slots having access to said liquid passageway, l) an opening in each closure, and m) a check valve over the opening. - View Dependent Claims (2, 3, 4, 5)
n) between the cover and the inlet the vanes do not extend to the housing and o) the downstream edge of the valves are parallel to the axis of the valve.
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4. The valve as defined in claim 1 wherein
h) a liquid output of a pump is connected to the inlet of the housing; -
i) a motor is driving connected to the pump, j) a liquid distribution system is connected to the outlet of the housing, and k) the pilot valve is connected to the outlet of the housing.
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5. The valve as defined in claim 4 wherein:
- said liquid passageway is large enough to permit a flowing of sufficient liquid to prevent damage to the pump or motor by their continued operation.
Specification