Abstract: A butterfly valve includes a valve body, a stem, a disc, and a stopper. The valve body has a first through hole, a second through hole and a flange. An axial central line of the second through hole and an axial central line of the first through hole are perpendicular to each other. The flange radially extends from a surface surrounding the first through hole and extends into an inner side of the first through hole. The stem is accommodated inside the second through hole and extends into the first through hole. The disc is formed on a surface thereof with a first engaging portion while the stopper is formed with a second engaging portion. The first engaging portion and the second engaging portion are respectively embedded with a first part and a second part of the stem. The stopper is rotated by the stem and abuts against the flange when the disc closes an open end of the first through hole and continues to rotate.

Abstract: A valve apparatus of the present invention includes a body, a seat and a cap, in which the body includes a chamber and passageway therein, the chamber is connected with the passageway, and the body includes a first ladder toward the passageway. The seat is disposed in the passageway. The seat includes a second ladder toward the first ladder of the body, and the second ladder of the seat is engaged with the first ladder of the body. The seat also includes a third ladder opposite to the second ladder. The cap has a flange which is contacted with the third ladder of the seat to fix the seat in the body tightly so that the cap is against the seat to prevent the seat from pulling out of the valve apparatus.

Abstract: Provided is a method of manufacturing an eccentric valve of a tri-offset structure including a valve body, a valve seat, a valve unit, and a valve stem. The method includes steps of providing a seal being a centrosymmetric ring with an outer edge surface being a cambered surface with a fixed curvature; disposing the seal on an annular surface of the valve unit; enabling the disposal position of the seal on the annular surface to deviate from the disposal position of a pair of second shaft holes provided in a longitudinal direction of the valve unit.

Abstract: A fluid valve with a single shaft-sealing module is disclosed. The single shaft-sealing module allows the annular shaft sealing rings to be squeezed to slightly deform to prevent gaps being formed between the shaft and the inner surface of the valve body, and facilitates easy clean and/or replacement of the worn shaft sealing rings.

Abstract: Provided is an eccentric valve and a manufacturing method thereof. The eccentric valve has a tri-offset structure, and comprises: a valve body, a valve seat, a valve unit, a valve stem and a seal. The disc-shaped valve unit is disposed in a through hole centered in the valve body. The valve stem penetrates shaft holes on the valve unit and the valve body. Rotating the valve stem causes rotation of the valve unit for closing/opening the through hole. The valve seat is mounted on the inner surface of the through hole, and the seal is mounted on the outer surface of the valve unit. When the through hole is closed, the valve seat and the seal are mutually engaged. The inner surface of the valve seat is part of an oblique cone. The seal is a centrosymmetric ring, of which the outer surface is cambered.

Abstract: A parameter selection and calculation system for control valves has a file manage unit for integrating and storing the files generated in operation. In that, the control valve specification table for control valves of similar forms can be stored in one control valve design file instead of being stored in various different files. Furthermore, a language selection unit provides the function that a user can select a desire language for operating. Moreover, a user can enter into a numerical input unit for inputting related design parameters for a specific control valve or getting related design parameters by selected proper control valve forms in the control valve design database. Then these data are formed as control valve parameter tables acceptable by the control valve logic operation unit. Then the control valve logic operation unit will operate to get a control valve specification table by using the control valve parameter tables.

Abstract: An automatic detecting and repairing wisdom valve apparatus includes a valve having a valve sheet; a valve switch connected to the valve sheet through a stem; a driver connected the valve switch; a position detector for detecting positions of the valve sheet with respect to time; a near field controller connected to the driver and the position detector and has a logic unit and a comparator; the logic unit storing rules for determining valve state; a far end control unit for receiving data about the valve; the far end control unit being monitored by monitoring members; and a fault elimination unit; the fault elimination unit storing rules for eliminating of faults about the valve automatically or reporting the faults to the far end monitoring members to do necessary actions. The comparator compares the position-time track of the valve sheet with the standard track the state of the valve.

Abstract: A ball or half-ball valve with drain-proof mechanism comprises a body; inner side of the body being formed as a chamber and a through hole communicated to the chamber; an annular seat received in an annular trench of a wall of the through hole; a drain-proof unit; a valve unit installed to the inner side of the annular seat; the valve unit having an axial hole for receiving the stem; and a cover having a size corresponding to that of the through hole of the body; the cover being locked to an outer side of the through hole. The drain-proof unit has three different structures. The elements of the structures are replaceable with each other for being installed to the valve. Each mode is suitable for different environments. In the present invention, the cover can be detached easily for repairing or maintaining the elements therein. It is easy and convenient.

Abstract: A tri-eccentric valve with a symmetric drain-proof ring includes a valve body, a stem, a valve disk, a waterproof washer, and a drain-proof ring. The valve disk is formed as an asymmetric conical shape. The drain-proof ring is an O ring and is arranged in a stepped recess of the valve disk to seal the waterproof washer; the drain-proof ring is symmetric to the axis of the ring. In assembly state, a periphery of the drain-proof ring resists against an inner wall of the annular seat. The drain-proof ring is symmetrical and thus is easy to be installed to the valve disk without to align the drain-proof ring to a specific angle. Furthermore, it can be designed by computers and is manufactured by machines. When dirt accumulates on the drain-proof ring, it can remove the dirt by directly rotating the drain-proof ring.