A blower for an HVAC system, the blower includes a housing with an intake and an outlet, a fan or blower wheel disposed within the housing and configured to draw air into the housing via the intake and to exhaust air from the housing through the outlet, and an adjustable cutoff plate configured to be moved between at least a first position defining a first cutoff angle and a second position defining a second cutoff angle.

An electrical submersible well pump (ESP) has a motor electrical connector mounted to an exterior of the motor. A motor sensor connects to an interior side of the motor electrical connector. Seal first and second electrical connectors mount to an exterior of a seal/motor adapter. A seal internal wire within the seal section electrically connects interior sides of the seal first and second electrical connectors together. An external motor jumper wire extends alongside the motor between the motor electrical connector and the seal first electrical connector. A pump electrical connector mounts to an exterior of a pump/seal adapter and connects to a pump sensor within the pump. An external seal jumper wire connects between the seal second electrical connector and the pump electrical connector.

An electric priming pump device detachably couples to a centrifugal water pump on the suction side of the water pump, for priming thereof. The device comprises an enclosure and a base, wherein the enclosure contains a rotary vane peripheral bypass vacuum motor which is pressed against the base to form an air-tight seal. The device generates a vacuum for priming through use of a rotary vane peripheral bypass vacuum motor, which can remove large volumes of air quickly. An opening in the base receives a check valve fitting to protect the motor from water and slows loss of vacuum pressure after use. Additionally, a cone shaped protective cover protects components in the device and provides space for branding or advertisement.

An impeller assembly and a pump for pumping a liquid, including a pump chamber and an impeller arranged to rotate in the pump chamber, the impeller being suspended in a lower end of an axially extending drive shaft unit, wherein the lower end of the drive shaft unit is received in a cylinder-shaped recess of the impeller, wherein the impeller is displaceable back and forth in the axial direction in relation to the drive shaft unit. The impeller further includes an axially extending hole that connects the cylinder-shaped recess and the pump chamber and that the drive shaft unit includes an axially extending pin that projects from the lower end of the drive shaft unit, wherein the pin is arranged in the hole.

The invention relates to a method for determining a pumped flow (Q) from a pump by a flowmeter that comprises an internal pressure sensor configured to measure the static liquid pressure (H-in) at the inner surface of the flowmeter, and an external pressure sensor configured to measure the static liquid pressure (H-out) at the outer surface of the flowmeter. The method comprises measuring the static liquid pressure (H-in) at the inner surface, measuring the static liquid pressure (H-out) at the outer surface, determining the Static head (H-stat) of the pump based on the measured static liquid pressure (H-in), the measured static liquid pressure (H-out) and a pressure difference (H-diff) corresponding to the difference in height position between the internal pressure sensor and the external pressure sensor, and determining the pumped Flow (Q) by using the determined Static head (H-stat) of the pump from a predetermined pump specific Q-(H-stat)-relationship.

A hydraulic system includes at least one circulation pump assembly (2) provided with a speed controller (4, 26), at least one hydraulic circuit (A, B) connected to the circulation pump assembly (2) as well as at least one mechanical switch device (86, 88; 120, 122) which is mechanically subjected to pressure by a fluid in the hydraulic circuit (A, B) and which can be moved into at least two different switch positions. The mechanical switch device (86, 88; 120, 122) moves by the circulation pump assembly (2) hydraulic coupling via the fluid. The speed controller is configured to initiate a movement of the switch device (86, 88; 120, 122), by at least one hydraulic force acting upon the switch device (86, 88; 120, 122) and causing a movement of the switch device (86, 88; 120; 122) via the hydraulic circuit, via a speed adaptation of the circulation pump assembly (2).

Systems and methods for determining a pump flow (Q) of a pump are disclosed. A method for determining a pump flow (Q) of a pump includes calculating an inverse of a polynomial equation defining a DP-Q performance curve of a pump, where the inverse is a Q-DP polynomial equation defining the performance of the pump, receiving a pump head (DP) value from a pump head sensor associated with the pump, computing a pump flow based on the Q-DP polynomial equation, comparing the computed pump flow to a preset target flow rate, and automatically controlling a pump parameter of the pump such that the calculated flow rate becomes the preset target flow rate.

A centrifugal pump (7), with one or more pumping stages, includes a pressure controlled valve (15) inside the pump (7) for supporting self-priming, the pressure controlled valve (15). The pressure controlled valve (15) includes a pretensioned leaf spring (17) and a valve seat (18). The leaf spring (17) has an opened position and a closed position. In the open position the leaf spring (17) is distanced from the valve seat (18). In the closed position the leaf spring (17) closes the valve seat (18). The leaf spring (17) and valve seat (18) are arranged for soft closing.

A fluid pump includes a housing; an inlet passage; an outlet conduit; a pumping element within the housing; and a check valve assembly. The check valve assembly includes a valve stem within the outlet conduit such that a flow path is created radially between the outlet conduit and the valve stem, the valve stem moving along a check valve assembly axis between a closed position and an open position. The flow path includes a first restriction which increases velocity of fluid passing through the flow path; a first expansion, downstream of the first restriction, which decreases velocity of fluid passing through the flow path; a second restriction, downstream of the first expansion, which increases velocity of fluid passing through the flow path; and a second expansion, downstream of the second restriction, which decreases velocity of fluid passing through the flow path.

The invention relates to a centrifugal pump assembly having an electric drive motor (2), at least one impeller (14) driven by said electric drive motor (2) and a valve element (24; 24′) rotatable between two 5 valve positions driven by a fluid flow produced by said impeller (14), wherein the valve element (24; 24′) has a cover plate (104; 104′) extending transverse to the rotational axis (X) of the impeller (14) and facing the impeller (14), wherein the valve element (24; 24′) having protrusions (102, 102′) arranged on an outer surface side facing away 10 from the impeller (14) such that a flow can act on them for driving the valve element (24; 24′).