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The new small-diameter welded steel cast-off valve is a new generation of replacement products for the development and production of small-diameter welded shut-off valves that are used in place of the traditional thermal power plants. The product design has the following characteristics: ◠Sealing Pairs tapered cone structure for the advanced spherical seal structure, the sealing pair in any case are well matched; ◠valve, valve sealing surface with high hardness of the hardness Hard alloy material with a special process forming and processing, valve sealing surface hardness of HRC60 (ordinary power station valve sealing surface hardness is generally around HRC35-40), even if the use of frequent opening and closing the sealing surface is still intact, such as the beginning , Without any indentation, changing the traditional products are often pressure test valve surface sealing surface that appears deep and irregular indentation conditions, thus greatly improving the valve sealing and service life, but also the sealing surface anti-gas Erosion and anti-scouring ability is greatly improved. ◠When the valve is closed, the high temperature medium entering the high temperature medium will slightly increase due to thermal expansion, resulting in a higher specific pressure between the sealing surface of the valve body and the valve disc (even crushing the sealing surface) Turn on the torque to increase. New products learn from foreign products? (Such as Japan's Okano high temperature and high pressure globe valve) design, the bracket two tendons to compensate for the role of compensation to absorb the thermal expansion of the valve stem; ◠stem nut structure improved into the stent in the hole directly cast aluminum bronze gold (copper alloy middle Hole pouring) and then directly processed on the trapezoidal thread, not only to improve the coaxiality (clear coaxial error), increased operational flexibility, but also greatly reduce the copper alloy consumption; ◠manual valve £ 3.5mm steel stamping handwheel (the introduction of German technology), reducing the valve weight; hand wheel strength, toughness than the cast iron hand wheel has been greatly increased, thereby enhancing the hand wheel in transport, use the anti-accidental impact ability; Handwheel cooling area (surface area), the operation of the low temperature is not hot; cast steel globe valve ◠packing plate with open-type pressure plate for easy operation; the upper end of the opening with a small boss to ensure that the upper part of the bolt will not accident Impact and slipping, improve safety and reliability; ◠increase the filler plate and packing the upper part of the cone with the cone angle (15 ° to 30 °) So that at both ends of the anchor bolt bead nut unsynchronized, unbalanced, the pressure plate cone can actually slide on the pressure supporting spherical, self-centering to ensure that the pressure sleeve is always able to vertical and balanced packing and to avoid Resulting in pressure stem askew and stem surface damage stem phenomenon; ◠handwheel square wheel and valve stem may have a slight gap between the body, in order to avoid operating the handwheel (handle) after a few loose nut, nut The spring washer is added to prevent loosening. ◠The connection between the valve body and the bracket adopts thread cold rolling, flexible grinding, multi-piece multi-bit drilling, milling, strong force forging with powder metallurgy, Methods and other advanced processes to improve processing efficiency and improve processing quality, compared with conventional products, improve product performance and life expectancy, while greatly reducing product manufacturing costs and product prices; ◠The series of valves containing the supercritical pressure level and pressure Greater than PN32.0MPa, P17.0MPa subcritical pressure valve.
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