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To contribute to an improvement in a dezincification resistance of a copper alloy, focusing attention on a relation between a dezincification resistance of a copper alloy and the crystal grain size of an phase, and the specific object is to provide a method of producing a hot forged product using a lead-free brass capable of ensuring corrosion resistances such as a prescribed dezincification resistance and the like even at sites of different thickness and shape, a hot forged product, and a wetted product such as a valve and a water faucet, molded using the same. A method of producing a hot forged product using a brass, comprising heat-treating a raw material to be subjected to forging work using a brass having a composition containing at least 59.2 to 63.0% by mass of Cu, 1.00 to 2.00% by mass of Sn and 0.05 to 0.25% by mass of Pb and containing the residue composed of Zn and inevitable impurities at a heating rate of 5.2 C/s or more from 350C until reaching the forging temperature.


[Problem] To provide a structure and method for fastening a ball seat for a ball valve, which is a ball valve suitable for high-pressure fluid, ensuring hermeticity and slidability by seal by a soft seat, the ball seat being held in a retainer even when ultrahigh-pressure fluid flows to prevent positional misalignment and detachment to keep high sealability when the valve is closed. [Solution] To solve this problem, the present invention is a structure and method for fastening a ball seat for a ball valve, a trunnion-type ball valve (100), and a hydrogen station using this valve, in which a stepped part (30) is provided in mid course of each of inner and outer peripheral surfaces of a resin-made annular seat body (21), with a seat part (31) provided on a tip side and a holding part (32) provided on a rear end side; an attachment groove (45) formed of inner and outer cylinders having a ring-shaped swaging edge part (34) is formed at a tip of a seat retainer (22); the holding part (32) is attached to this attachment groove (45); and the swaging edge part (34) of the inner and outer cylinders is closely contacted and fixed by being swaged to the stepped part (30) to cause the seat part (31) to protrude more than a swaging position.


A structure and method for fastening a ball seat for a ball valve, a trunnion-type ball valve (100), and a hydrogen station using this valve, in which a stepped part (30) is provided in mid-course of each of inner and outer peripheral surfaces of a resin-made annular seat body (21), with a seat part (31) provided on a tip side and a holding part (32) provided on a rear end side; an attachment groove (45) formed of inner and outer cylinders having a ring-shaped swaging edge part (34) is formed at a tip of a seat retainer (22); the holding part (32) is attached to this attachment groove (45); and the swaging edge part (34) of the inner and outer cylinders is closely contacted and fixed by being swaged to the stepped part (30) to cause the seat part (31) to protrude more than a swaging position.


Patent
Kitz Corporation | Date: 2015-08-27

A trunnion-type ball valve including a seat retainer (14) attaching a ball seat(s) to at least one side of a ball (12) having a through hole (12a) provided in a body (11). The ball is turnably provided via a stem (13), and the ball seat is attached in a protrusion-prevented and free state in an attachment groove formed in the seat retainer. An excessive pressure due to an abnormal pressure rise in a cavity upon full close or upon full open is configured to be relieved into a flow channel via a communication part provided between an inner peripheral surface of the ball seat and the attachment groove by moving the seat retainer in a direction opposite to the ball by self-tension utilizing the pressure and pushing-out the ball seat to a ball-side by the excessive pressure flowed into a rear-surface side of the ball seat in the attachment groove.


Patent
Kitz Corporation | Date: 2015-01-07

A trunnion ball valve for high pressure and a hydrogen station are provided, which achieves low torque during operation, and whose durability is improved to maintain sealing ability for a long period of time. In a trunnion ball valve including a ball provided inside a body main unit in a freely rotatable manner; and a seal mechanism provided on positions on both sides of the ball so as to be in seal contact with the ball, the seal mechanism including: a seat retainer having a sealing surface that is to be in seal contact with a ball surface of the ball; a spring member provided for applying elastic force on the sealing surface side; and a sealing member provided on an outer surface of the seat retainer, at least both of the sealing surface and the ball surface has a coating layer of diamond-like carbon provided thereon, so as to exhibit sliding ability and sealing performance.


Patent
Kitz Corporation | Date: 2016-11-30

A trunnion-type ball valve that can prevent fall-off of a ball seat from a seat retainer, can relieve the abnormal pressure rise in a cavity while avoiding abrasion of the ball seat, can improve workability and assembly performance by ensuring strength while suppressing increase in the number of parts and simplifying the structure, and can improve the durability of the ball seat by improving the sealing characteristics of the ball seat and a valve element even in a case of high pressure and preventing leakage is provided. A seat retainer 14 attaching a ball seat (s) 15 to one side or both sides of a ball 12 having a through hole 12a provided in a body 11 is disposed, the ball 12 is turnably provided via a stem 13, and the ball seat 15 is attached in a protrusion-prevented and free state in an attachment groove 32 formed in the seat retainer 14. An excessive pressure due to an abnormal pressure rise in a cavity 35 upon full close or upon full open is configured to be relieved into a flow channel via a communication part 40 provided between an inner peripheral surface 27 of the ball seat 15 and the attachment groove 32 by moving the seat retainer 14 in a direction opposite to the ball 12 by self-tension utilizing the pressure and pushing-out the ball seat 15 to a ball-12 side by the excessive pressure flowed into a rear-surface side of the ball seat 15 in the attachment groove 32.


Provided is a brass alloy excellent in recyclability and corrosion resistance while avoiding the addition of Bi and Si, and with which machinability is ensured and processing is facilitated with preventing inclusion of lead. The present invention includes at least 58.0 to 63.0 mass% of Cu, 1.0 to 2.0 mass% of Sn and 0.05 to 0.29 mass% of Sb and the remainder composed of Zn and unavoidable impurities. With the present invention, stress corrosion crack resistance and machinability are improved. 0. 05 to 1.5 mass% of Ni is included in a copper alloy to improve stress corrosion crack resistance as a result of the interaction between Ni and Sb. Furthermore, 0.05 to 0.2 mass% of P is included to improve anti-dezincification properties.


Patent
Kitz Corporation | Date: 2016-06-29

A high-pressure trunnion ball valve which is particularly suitable for a high-pressure fluid, suppresses a thrust load to a stem to realize low torque performance while maintaining a valve seat sealing performance even under a high pressure, and can perform opening and closing operations by an approximately constant and stable operation torque and can be made small, and a hydrogen station using the same are provided. The high-pressure trunnion ball valve is composed of a ball 10 rotatably provided in a body 3 having a lid member 2, a seat retainer 11 seal-connected to the ball 10, a spring member 12 applying an elastic force to the seat retainer 11 to a seal side, and a seal member 13 attached to an outer circumferential face of the seat retainer 11. An upper stem 50 and a lower stem 51 having the same diameter are provided on an upper side and a lower side of the ball 10 in an extending manner, respectively, to constitute a ball member 52, shaft-attaching seal mechanisms 20 having the same structure are attached to the upper and lower stems 50 and 51 at symmetrical positions regarding the ball 10 to achieve a balance structure, thereby avoiding thrust loads.


A circulation type aquaculture method and a circulation type aquaculture apparatus which treat and remove ammonia harmful to fishes/shellfishes. The method includes a first step of finding an ammonia decomposition rate upon preliminarily treating cultivation water by using ozone or hypochloric acid so as to set a target remaining amount of ammonia after the decomposing treatment, a second step of finding the amount of ammonia in cultivation water so as to calculate a treating period of time required for reducing the amount of ammonia to the target remaining amount of ammonia based upon the ammonia decomposition rate of the first step, a third step of treating the cultivation water using ozone or hypochloric acid during the treating period of time calculated in the second step so as to treat and decompose ammonia in the cultivation water and a fourth step of returning the cultivation water to the aquaculture tank.


Patent
Kitz Corporation | Date: 2016-07-27

An object of the present invention is to provide a circulation type aquaculture method and a circulation type aquaculture apparatus which treat and remove ammonia harmful to fishes/shellfishes, while preventing generation of toxic oxidants caused by an excessive treatment, so as to carry out an ammonia removing treatment in accordance with an increase/decrease of the amount of ammonia discharged from fishes/shellfishes, thereby making it possible to prevent the accumulation of ammonia in cultivation water. In order to achieve this object, the method is proposed in which cultivation water in a circulation type aquaculture tank for rearing aquatic organisms is treated by an aquaculture apparatus main body, and this method is provided with means having a first step of finding an ammonia decomposition rate upon preliminarily treating the cultivation water by using ozone or hypochloric acid so as to set a target remaining amount of ammonia after the decomposing treatment, a second step of finding the amount of ammonia in cultivation water so as to calculate a treating period of time required for reducing the amount of ammonia to the target remaining amount of ammonia based upon the ammonia decomposition rate of the first step, a third step of treating the cultivation water by using ozone or hypochloric acid during the treating period of time calculated in the second step so as to treat and decompose ammonia in the cultivation water and a fourth step of returning the cultivation water that has been subjected to the decomposing treatment in the third step to the aquaculture tank.

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