A dense-phase powder pump for conveying powder-type materials, in particular coating powder, includes at least one powder conveying chamber with a filter element that has at least regions thereof accommodated in a casing body and at least one pinch valve that is or can be connected to an end region of the powder conveying chamber. In particular, the pinch valve includes a valve element with at least regions that are sleeve-like, wherein the peripheral wall thereof can be squeezed together transverse to the valve element longitudinal axis in order to change the through-flow cross-section, and also includes a substantially tubular support structure, in which at least regions of the valve element are accommodated, wherein the support structure consists of multiple shell elements which are arranged one after another around the peripheral wall in the peripheral direction of the peripheral wall of the valve element, each having an arched cross-section, and which are placed on the outside of the valve element in a radial direction relative to the valve element longitudinal axis.

A fluid flow control valve includes a valve body with a fluid flow lumen therethrough and a valve member located within the fluid flow lumen. At least one of the valve body and valve member is resilient and respectively sized for movement between a normally closed position in which the valve member and a fluid lumen surface are in sufficient annular contact to block fluid flow through the fluid flow lumen and an open position in which at least one of the valve body and valve member flexes to a spaced apart position that allows fluid flow between them. Downstream fluid pressure may contact the valve body to enhance sealing. A fluid absorbent member may also be employed with the valve body. Flow control devices, such as medical fluid injection devices, and methods may employ this valve.

The pump can have a support having a guide extending around an axis, a radial position of the guide relative the axis varying around the axis, and a first oil passage formed in the support; a rotary assembly mounted to the support via support bearings, and rotatable around the axis, the rotary assembly having a second oil passage and a cylinder, the cylinder extending radially relative the axis, an inlet port fluidly connecting the first oil passage to the cylinder, and an outlet port fluidly connecting the cylinder to the second oil passage, and a piston slidingly mounted in the cylinder, a radially-outer end of the piston further slidingly engaged with the guide.

A Venturi pump used for sucking powder from a supply, diluting the same, then feeding it to a gun via a conveyor pipe. The pump comprises an outer body, at least one powder suction duct, at least two air connections, of which a first air connection is capable of supplying an injector to create a vacuum inside the suction duct and a second air connection is capable of supplying a dilution air circuit separate from the powder flow. The pump including at least one powder outlet nozzle centered on an axis of diffusion, the inlet of which is located downstream from the first air connection and the suction duct. At least one protection barrier contains a non-return valve disposed inside the dilution air circuit and at least one outlet tip of the dilution circuit disposed around the nozzle and also connected to the conveyor pipe.

A membrane vacuum pump has at least one working space which is bounded by a membrane deformable to change the size of the working space and by a wall in which at least one inlet and at least one outlet are formed for a medium which is sucked into the working space which increases in size in so doing in a suction phase and is expelled via the outlet from the working space which decreases in size in so doing in a compression phase. The membrane vacuum pump furthermore has a controllable actuator unit for deforming the membrane by a contactless action on the membrane by means of electrical and/or magnetic fields.

The pump can have a support having a guide extending around an axis, a radial position of the guide relative the axis varying around the axis, and a first oil passage formed in the support; a rotary assembly mounted to the support via support bearings, and rotatable around the axis, the rotary assembly having a second oil passage and a cylinder, the cylinder extending radially relative the axis, an inlet port fluidly connecting the first oil passage to the cylinder, and an outlet port fluidly connecting the cylinder to the second oil passage, and a piston slidingly mounted in the cylinder, a radially-outer end of the piston further slidingly engaged with the guide.

A dense-phase powder pump for conveying powder-type materials, in particular coating powder, includes at least one powder conveying chamber with a filter element that has at least regions thereof accommodated in a casing body and at least one pinch valve that is or can be connected to an end region of the powder conveying chamber. In particular, the pinch valve includes a valve element with at least regions that are sleeve-like, wherein the peripheral wall thereof can be squeezed together transverse to the valve element longitudinal axis in order to change the through-flow cross-section, and also includes a substantially tubular support structure, in which at least regions of the valve element are accommodated, wherein the support structure consists of multiple shell elements which are arranged one after another around the peripheral wall in the peripheral direction of the peripheral wall of the valve element, each having an arched cross-section, and which are placed on the outside of the valve element in a radial direction relative to the valve element longitudinal axis.

A valve for a displacement pump includes a valve body having an annular strikeface and defining an annular receptacle, and an annular seal received in the receptacle of the valve body, the seal including an annular contact surface, wherein the seal defines a cumulative displacement ratio of (i) at least one of at most 0.20 at a location that is spaced 40% from an inner diameter (ID) of the contact surface of the seal moving towards an outer diameter (OD) of the contact surface, (ii) at most 0.35 at a location that is spaced 55% from the ID of the contact surface moving towards the OD of the contact surface, and (iii) at most 0.45 at a location that is spaced 65% from the ID of the contact surface moving towards the OD of the contact surface.