A lead-free brass alloy contains 57.0 to 60.0% wt. Cu, 1.0 to 2.0% wt. Al, 1.5 to 2.5% wt. Mn, 0.1 to 1.0% wt. Fe, at most 0.5% wt. Ni, at most 0.5% wt. Sn, 0.5 to 2.0% wt. Si, less than 0.1% wt. Pb, balance Zn and also unavoidable impurities. Wherein the copper equivalent (CuEq) is in the range from 52.0 to 58.0%.

A pulsation damper (100) for a condensate pump comprising a body (105) having a fluid inlet (115), a fluid outlet (125), an inner wall portion (107) and an outer wall portion (108), wherein the inner (107) and outer (108) wall portions define an inner fluid region (160) and an outer fluid region (165), wherein the inner fluid region (160) is in fluid communication with the outer fluid region (165), wherein a fluid flow path is formed from the fluid inlet (115) to the fluid outlet (125) via the inner fluid region (160), wherein the outer fluid region (165) is in fluid communication with an air inlet (130) and configured to maintain an air pocket, and wherein the air pocket is configured to dissipate pulsations within liquid entering the fluid inlet (115) prior to being discharged from the fluid outlet (125).

The present disclosure provides a fracturing equipment. The fracturing equipment includes: a plunger pump, a main motor and a noise reduction device. The plunger pump is used for pressurizing liquid. The main motor is connected to the plunger pump by transmission for providing driving force to the plunger pump. The noise reduction device is constructed as a cabin structure and covers outside the main motor and isolates the main motor from the plunger pump. With the fracturing equipment according to the present disclosure, the fracturing equipment is driven by the main motor with relatively low noise during operation. The noise reduction device isolates the main motor from the outside, which can effectively reduce the noise intensity transmitted to the outside during operation, thereby achieve the effect of noise reduction. In addition, the plunger pump is isolated from the main motor by the noise reduction device, thus realizing isolation of high-pressure dangerous areas and ensuring safe operation.

An example hydraulic pump comprises: a housing; an input shaft extending from the housing; a seal disposed within the housing and positioned about the input shaft; and a seal guard member positioned about the input shaft and mounted to the housing at an interface between the input shaft and the housing, wherein the seal guard member is configured to allow rotation of the input shaft without rotating therewith.

Various assemblies that can be used in a mud pump with a plunger-style piston to reduce seal failures, to offer control in variability of the circumference of the piston to thereby control fluid pressure, and to provide visibility into seal condition during operation. In one embodiment, a sleeve that can vary the overall effective circumference of the piston enables fluid pressure control. In some embodiments, seal failure within a pump can be monitored via a drain port that would receive drilling fluid leaking past a seal during operation of the pump. A discharge valve can be provided between an inlet and an outlet of the mud pump to reduce the load on pump components during start-up. Additional systems, devices, and methods are also disclosed.

A fluidic device is disclosed, comprising an enclosed passage that is adapted to convey a circulating fluid. The enclosed passage comprises a flow unit having a first electrode and a second electrode offset from the first electrode in a downstream direction of a flow of the circulating fluid. The first electrode is formed as a grid structure and arranged to allow the circulating fluid to flow through the first electrode. The fluidic device may be used for controlling or regulating the flow of the fluid circulating in the enclosed passage, and thereby act as a valve opening, reducing or even closing the passage.

A fluidic device is disclosed, comprising an enclosed passage that is adapted to convey a circulating fluid. The enclosed passage comprises a flow unit having a first electrode and a second electrode offset from the first electrode in a downstream direction of a flow of the circulating fluid. The first electrode is formed as a grid structure and arranged to allow the circulating fluid to flow through the first electrode. The fluidic device may be used for controlling or regulating the flow of the fluid circulating in the enclosed passage, and thereby act as a valve opening, reducing or even closing the passage.

The present invention concerns an axial piston pump (1, 1′, 1″,1′″) for the pumping of a liquid comprising: a head (20) in which there is at least partially made a plurality of cylinders (25) in a number greater than three, with central axes parallel between them, a plurality of pistons (75) each of which slide in a respective cylinder (25) of the plurality of cylinders (25) for the pumping of the liquid, and a suction channel of the liquid to pump, which is equipped with a primary duct (140) and a plurality of branch ducts (145, 145′,145″), each of said branch ducts (145, 145′,145″) being adapted to place the primary duct (140) in fluid communication with a respective cylinder (25) of the plurality of cylinders (25), in which the primary duct (140) is positioned between the central axes of the cylinders (25).

A multi-piece fluid end that can be produced with fewer raw materials and at a lower cost. In one embodiment, a fluid end is formed from a first body attached to a separate second body. Their respective external surfaces may be engaged flushly, partially, or via one or more spacer elements. In some embodiments, the body pieces are flangeless to reduce stress on the fluid end. The second body may have a plurality of bores that are alignable with a plurality of corresponding bores formed in the first body. The second body may be connected to a power end using a plurality of stay rods. In other implementations, more than two body pieces may be utilized.

A pump assembly and a cooking appliance having a pump assembly are provided. The pump assembly may include a cavity that defines a cooking cavity; a water supplier installed outside of the cavity; a connection pipe connected to the water supplier; and a pump assembly disposed outside of the cavity and connected to the connection pipe. The pump assembly may includes at least one pump; and a support made of a flexible material and coupling the at least one pump to an upper surface of the cavity.