Flow control devices herein have a housing defining a plurality of parallel conduits. The first conduit has a normally closed check valve defined to open under a first preselected pressure differential controlling flow through the first conduit in a first direction of flow. The second conduit has a normally neutral check valve defined to open under a second preselected pressure differential in a second direction of flow that is opposite the first direction of flow. The third conduit defines a restriction profile, i.e., has a restrictor, having a third preselected pressure differential. The flow control devices are included as part of an engine system, more specifically a crankcase ventilation breach detection system.

A breach detection system for an internal combustion engine having a crankcase, an intake manifold, a positive crankcase ventilation valve, a crankcase ventilation tube with a flow control system therein, and a pressure sensor between the flow control system and the crankcase. The flow control system subdivides the crankcase ventilation tube into a plurality of parallel conduitsa first conduit having a normally closed check valve that opens under a first preselected pressure drop in a first direction from the air intake to the crankcase, and a second conduit having either a second check valve that opens under a second preselected pressure drop in a second direction opposite the first direction or a restriction profile having a third preselected pressure drop that is the same in both the first and second direction. When the pressure sensor detects no pressure drop there is a breach in the system.

A valve assembly for a refrigerant circuit, having at least two ball valves, which each have a ball as a control element and an actuator for adjusting the associated ball, and also a refrigerant circuit having heat pump functionality for a vehicle having such a valve assembly.

The invention relates to a valve for interruption of a fluid flow along a fluid flow path passing through the valve, the valve includes an inlet adapter, a valve body connected to the inlet adapter, a seal arranged between the inlet adapter and the valve body with a seal opening through the seal for the fluid flowing when the valve is open, a motor control gear unit, and a sealing body with a ball segment-shaped sealing surface element and bearing element arranged on the side of the sealing surface element. The sealing body is mounted within the valve body so as to be rotatable around an axis running substantially perpendicular to the fluid flow path and through the bearing element.

Embodiments of a valve assembly and a plumbing system incorporating the same are provided herein. In some embodiments, a valve assembly for use with an enclosed environment includes a housing having an interior volume, an inlet disposed at a first end of the housing and fluidly coupled to an environment surrounding the housing, and an outlet disposed at a second end of the housing opposite the first end and fluidly coupled to the enclosed environment; a first valve having a first valve seat and a first sealing member at least partially extending through a first opening in the first valve seat in a closed position; and a second valve disposed beneath the first valve and having a second valve seat and a second sealing member at least partially extending through a second opening in the second valve seat in a closed position.

Valve assemblies for reciprocating downhole pumps are provided. The valve assembly may comprise: a flow cage comprising a housing and a tubular insert; an annular valve seat positioned below the tubular insert; and an elongated sealing member positioned above the annular valve seat and at least partially received into the tubular insert. In some embodiments, the elongated sealing member may be more stable and may more securely engage the valve seat compared to spherical valve balls. Related methods are also provided.

A combination control and check valve assembly for a wet piping system includes a control valve in the form of a ball valve and a one-way check valve mounted within the flow pathway of the ball valve. A valve actuation assembly is mounted to the valve assembly to selectively rotate the ball valve between the open and closed positions thereof. The valve actuation assembly is mounted to a first side of the valve assembly and rotationally fixed to the ball, whereby rotation of the valve actuation assembly rotates the ball between the open and closed positions. A side opening is formed in a second side of the valve assembly that is angularly spaced from the first side. The side opening is positioned to align with the fluid flow pathway of the ball valve in the closed position thereof to provide access to the check valve.

Embodiments of air admittance valve assembly and plumbing system incorporating the same are provided herein. In some embodiments, a valve assembly comprising a housing, a first valve comprising a first valve sealing member and a first valve seat, and a second valve comprising a second valve sealing member and a second valve seat, and a pipe, an inlet, an outlet, a first zone, a second zone, a third zone, the first and second valve sealing member is closed by gravity and open based upon the pressure differential between the first zone, second zone and third zone.

A valve apparatus for use in industrial plants and systems. The valve apparatus can a first ball valve, a second ball valve, a third ball valve, and a fourth ball valve disposed between first and second blocks. A bleed valve assembly is disposed between the first ball valve and the second ball valve, and the fourth ball valve is disposed between the second and third ball valves. The bleed valve assembly is configured with threads or a cam lock for connection to a flex hose. The bleed valve assembly can include a globe valve. The valve apparatus can be implemented as a DBB (Double-Block and Bleed) valve assembly that includes the first, second, third, and fourth ball valves. The fourth ball valve disposed between the second and third ball valves can function as an extra bleed valve.

A water resistant hand pump fabricated entirely from plastic components is provided. The pump comprises a pump housing, actuator, piston, chaplet, stem and a pump spring where the pump spring is in the form of an elastic dome made from an elastomeric polymer. The all plastic hand pump is suitable for dispensing liquids and creams from a dispenser bottle. Used pumps do not require disassembly to be recycled.