A method of calibrating a choke system includes connecting to the positioner an electronic controller which is programmed to output a control signal representing the desired position of the plug, connecting to the electronic controller a flowmeter which is configured to provide a flow signal representing the rate of flow of fluid from the pump to the inlet and a pressure sensor which is configured to provide a pressure signal representing the fluid pressure at the inlet, connecting the inlet to a reservoir of fluid via a pump which is operable to pump fluid from the reservoir into the inlet at varying flow rates, and using gain scheduling to determine optimum values of proportional gain and integral gain required for control of the choke using a proportional differential and integral controller at a plurality of different rates of flow of fluid along the central flow passage.

A control valve includes a casing, a valve body, and a seal cylinder member. The casing has an inlet and an outlet. The valve body is rotatably disposed inside the casing, and has a circumferential wall portion formed with a valve hole providing communication between the inside and the outside. One end portion of the seal cylinder member communicates with the outlet, and a valve sliding contact surface is provided at the other end portion. A flow rate control groove having a bottom surface which is recessed with respect to the outer circumferential surface of the circumferential wall portion and has one end portion continuous with the valve hole is provided on at least one of a front side and a rear side of an edge portion of the valve hole in the circumferential wall portion in a rotating direction of the valve body.

A deaeration valve includes a housing and a ball in fluid communication with housing. The ball can include a body, a seat defining a bleed passage therein, and a deaeration pin slidably disposed within the bleed passage. Further, the deaeration pin may include a head, a retention feature, and a shaft positioned between the head and the retention feature.

The disclosure provides a control valve which includes a valve body and a valve gate. The valve gate is movably located inside the inner space. The control valve has a lower flow rate limit which is greater than zero. That is, the lower flow rate limit has no necessary to be zero, thus it is acceptable to have a cylindrical valve gate but not a spherical valve gate. Therefore, the valve gate can be directly installed into the valve body via the opening, which allows the valve body to be made of a single piece so as to simplify the processes of manufacturing and assembly.

The present flow regulating valve relates to devices for regulating the flow parameters of working media and can be used in equipment in the gas, oil, chemical, power, metallurgical and coal industries. The present flow regulating valve comprises a housing with a regulating element having inlet and outlet pipes with through passages and movable and immovable regulating teeth having a streamlined shape and terminating in a taper, wherein the size of the angle of the tapered portion is defined as 360/n, where n is the number of movable teeth. What is novel is that each tooth has an independent actuator, the immovable teeth have a cross section in the shape of an isosceles triangle, and the regulating zone has a cross section in the shape of a multi-point star. This design provides excellent characteristics in terms of response time and the overall weight of the structure, which is particularly relevant in the case of regulators having a cross-section diameter of 500 mm or more.

The present flow regulating valve relates to devices for regulating the flow parameters of working media and can be used in equipment in the gas, oil, chemical, power, metallurgical and coal industries. The present flow regulating valve comprises a housing with a regulating element having inlet and outlet pipes with through passages and movable and immovable regulating teeth having a streamlined shape and terminating in a taper, wherein the size of the angle of the tapered portion is defined as 360/n, where n is the number of movable teeth. What is novel is that each tooth has an independent actuator, the immovable teeth have a cross section in the shape of an isosceles triangle, and the regulating zone has a cross section in the shape of a multi-point star. This design provides excellent characteristics in terms of response time and the overall weight of the structure, which is particularly relevant in the case of regulators having a cross-section diameter of 500 mm or more.

A flow control valve comprises three orifices. Each of the three orifices is connectable to a fluid conduit, respectively. Each of two orifices of the three orifices is modulatable between a closed mode in which that orifice is substantially closed, and an open mode in which that orifice is open. Each of the two orifices is also modulatable between the closed mode and the open mode while the other one of the two orifices is in the closed mode. Depending on the application, the orifices may be used as inlets or outlets and in different combinations of inlets and outlets. A hydronic system that includes the flow control valve is also described.

A flow control valve comprises three orifices. Each of the three orifices is connectable to a fluid conduit, respectively. Each of two orifices of the three orifices is modulatable between a closed mode in which that orifice is substantially closed, and an open mode in which that orifice is open. Each of the two orifices is also modulatable between the closed mode and the open mode while the other one of the two orifices is in the closed mode. Depending on the application, the orifices may be used as inlets or outlets and in different combinations of inlets and outlets. A hydronic system that includes the flow control valve is also described.

A blood flow environment simulation device is disclosed, including: a liquid reservoir (1) for storing liquid; a vascular simulation tube (4); a pump (2) for pumping liquid; a plurality of circulation tubes (7, 11, 12), which form a liquid circulation path together with the vascular simulation tube; and a valve (6) located in the circulation path, having a valve inlet (17) and a valve outlet (18), wherein the area of the valve inlet (17) is variable to change the dynamic parameters of the fluid in the vascular simulation tube (4) over time. The present disclosure also relates to medical equipment that includes a blood flow environment simulation device as described.

A blood flow environment simulation device is disclosed, including: a liquid reservoir (1) for storing liquid; a vascular simulation tube (4); a pump (2) for pumping liquid; a plurality of circulation tubes (7, 11, 12), which form a liquid circulation path together with the vascular simulation tube; and a valve (6) located in the circulation path, having a valve inlet (17) and a valve outlet (18), wherein the area of the valve inlet (17) is variable to change the dynamic parameters of the fluid in the vascular simulation tube (4) over time. The present disclosure also relates to medical equipment that includes a blood flow environment simulation device as described.