1. The use of stainless steel bellows shut-off valve installed in the pipeline of marine power plant, the valve stem occurred at the valve during the use of leakage and stem rust and other issues, although the repair. But problems recur. After analysis of the cause of the malfunction, take appropriate solutions to eliminate the failure to ensure the performance of the valve. 2. Analysis of the problem Stainless steel bellows valve leakage is generally divided into internal leakage and leakage of two cases, causing more leakage. Endocrine is generally due to the number of liquid medium containing solid impurities damage sealing surface caused failure. Combined with field use analysis, the main reason for valve stem leakage is related to the structure of the valve, working environment and operation mode of operation. 2.1 Structure The valve stem adopts corrugated pipe and packing double seal structure. The bellows is welded with inner lining ring and outer lining ring into bellows assembly, and then welded with valve stem and guide body to block leakage of medium through valve stem. Upward and downward movement of the stem flat key â… upward movement, until the flat key â… and the lower end of the lower end surface of the filler in contact. As the underfill material is made of PTFE material, if the valve is opened excessively, the flat key I will be embedded in the filler, the valve can not be opened and closed, and the bellow assembly will be hit, causing the leakage of the medium along the stem. Corrugated tube length and amount of compression is determined according to the valve stroke, if the stretch or compression beyond the limit, it may damage the bellows, resulting in rupture of a small tube, seal failure. Therefore, the need to increase the valve opening and closing of the limit device, making the valve opening and closing process, the bellows has been in the design range of telescopic. 2.2 Working environment Corrugated pipe shut-off valve poor working conditions is also a cause of its failure. As the bellows installed in the hull of the long-term work in the salt spray environment, and the upper often condensate dripping, resulting in the upper thrust ball bearings corrosion, serious, resulting in contact with the stem corrosion 2.3 operation in use if excessive Opening or closing the bellows shut-off valve may result in the valve not meeting the performance requirements. When the valve is closed excessively, it is possible to crush the sealing surface, resulting in failure of the seal when the valve is used again. When the valve is opened excessively, the bellows assembly may be operated, causing the valve to leak. 3. Improve After analyzing the valve problems, its structure, operation and the environment has been improved. The first is to increase the flat key I limit welfare fee, the PTFE material under the filler asked to add a 3 mm thick stainless steel filler pad to prevent stuffing becomes dirty and the valve stem limit. When the valve is closed, if the valve can not be closed, it should not be forced to close. Instead, the valve should be opened and closed again after fluid is washed for a period of time. If the valve still can not be closed, the sealing surface should be inspected. When the valve is open, when the valve is opened to a certain height, the stem encounters a small resistance, try not to continue to force open, in order to extend the life of the stem and seal components ah. Valve stem with thrust ball bearings on the top of the globe valve, when installed, we should try to avoid there is a direct drop of condensed water in the valve account which led to the valve stem corrosion position. 4. Conclusion bellows shut-off valve improved, no recurring bellows cracks, valve stem rust and leakage and other failures, the use of good.
KONE Elevator Spare Parts
KONE Elevator Spare Parts, KONE Elevator Parts, KONE Lift Spare Parts, KONE Lift Parts
KONE Oyj (officially typeset KONE and pronounced /koʊneɪ/), founded in 1910 and headquartered in Helsinki, Finland, is an international engineering and service company employing some 49,000 personnel worldwide. The firm is the 4th largest manufacturers of elevators and escalators worldwide, and also provides maintenance services and modernization. In addition, KONE builds and services automatic doors and gates. The company provides local service for builders, developers, building owners, designers and architects in 1,000 offices in over 50 countries.Since 1924, KONE has been owned by one of Finland's wealthiest families, the Herlin family. After Harald Herlin purchased the company in 1924, he served as its Chairman until 1941. Afterwards, his son, Heikki H. Herlin, took over his father's post from 1941–1987. Control of the company was then handed down to his son, Pekka Herlin, which he retained from 1987–2003. The current Chairman of KONE's Board of Directors from 2003 onwards is Antti Herlin, the son of Pekka Herlin.
In the Finnish language Kone means "machine" or "device".
KONE UltraRope
In June 2013 the company launched a new high-rise elevator technology, called 'KONE UltraRope', which enables future elevator travel heights of 1 kilometre. The product is light due to its carbon fibre core and a high-friction coating. Because of these qualities, elevator energy consumption in high-rise buildings can be cut significantly.
KONE EcoDisc motor
The 'KONE EcoDisc motor', used for hoisting, reduces the amount of energy lost as heat. The motor control system and brakes make the elevator ride quiet and the design frees up space.
Elevators
The 'KONE MonoSpace' for low- to mid-rise buildings is the world`s first machine-room-less elevator.The 'KONE EcoSpace' elevator is a machine-room-less traction elevator designed for low-rise buildings from 2 to 15 stories as an energy-efficient alternative to hydraulic elevators, and can fit in an existing hydraulic elevator hoistway. It is produced in a 150 feet per minute (0.76 m/s) speed, 200 feet per minute (1.0 m/s) and 350 feet per minute (1.8 m/s) variants.The 'KONE MiniSpace' elevator with a small machine room is often used in high-rise buildings.
Other trademarks
'People Flow' is a registered trademark of KONE Corporation.
KONE Elevator Spare Parts, KONE Elevator Parts, KONE Lift Spare Parts, KONE Lift Parts
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