Design criteria for butterfly slow-down valves: cj/t282-2008. Jb/t 5299-1998. Cj/t154-2001. Jb... A butterfly pump control valve。
The butterfly-stop valve is rotated around the inner axis of the valve, which, like the butterfly valve, passes through the valve stream, using either vertically or tilted towards the stream。
I. Hh47x, hh47h stifling valve
Butterflies slow-out valves. Installation at pumping exits, using medium pressure to boost the opening of the butterfly plate, when the pump is not normal, the butterfly plate, driven by its own gravitational and medium reflow pressure, is first quickly shut down by about 80 per cent and then slowly shut down the remaining 20 per cent through a slow-down of the hydraulic pressure tank。
Fluttersty slow closing valves, also known as butterfly buffer valves. It consists mainly of major parts such as valves, bilges, and anti-nithic tanks. The valves are tilted and the balconies are designed with two or three eccentricity。
Small caliber is a single-flash plate structure. When large calibers are used, the structure of the butterflies is used. The valve axis is on the side of the channel and is not in the middle of the butterfly plate。
At the same time, the balconies are tilted around 20°, reducing the journey of the valves during their release, so that the valves are closed for a relatively short period of time, thus achieving the rapid opening of the valves。
At the same time, valves can save power by their own gravity while closing back. The advantage of tilting valves is also to reduce the friction of seals between valves and valves and to extend the useful life of the seals. Valves can reach dn2000。
Ii. Liquid automatic control valves
Liquid automatic control valves, also known as hydraulic automatic valves. It is improved on the basis of a butterfly slow-closure valve, with access to the valve entry and exit end on both sides of the closed hydraulic tank. Quick-closure cylinders driven by the internal medium pressure of the pipe. Disruptive water hammers were prevented from causing a slow-down in the event of a leak of fluid from an external hydraulic tank。
Iii. Hh46x, hh48x, hh49x micro-retarded shut-off valves。
The micro-depressive closed-button valves consist mainly of valves, two semi-circle valves, repo springs, oil-storage pistols, obstructive pistons (cooled pistols), needle valves (micro-regulating valves)。
Double-capture structures are essentially spin-off valves. It's just a two-part truncheon, each of which is spin-off. The industry is also known as the micro-retardation of closed butterfly formation to stop the valves. Valves can run as far as dn 1600。
There are hydraulic fluids in the portable hydraulic tank, which regulates the slowness of the confinement through the opening of the needle valve, with two slow pistons corresponding to two valve plates on the valve. Following the quick closure of two valves, the piston was placed on an outstretched, and the piston was pressured back into the piston, and the valve was then slowly closed to eliminate the water hammer phenomenon。
Iv. Bfdg7m41hx tube valve, also known as the butterfly pump control valve。
Composed of valves, large valve plates, small valve plates, valve poles, control poles, membrane cavities (pistols), membranes (pistols) and control pipes, etc., have the function of preventing reflow, light-loading pumps, water-reducing hammers, etc. Passage up to dn3000, pn40. It's the latest form of improvement of the butterfly shut-down valve。
A tube valve can achieve two-stage valves, with a fast closure of large valves, cutting off most of the reflow media to prevent a high rate of reversion of the pump; and a slow closing of small valves, releasing a small amount of reflow media, can significantly reduce the pressure of the hammer and prevent overpressure from causing a hammer accident. Time off can be adjusted. For a dn400 diameter or more, the valve plate is closed with a piston subdued device. To prevent the impact valve sealing when the plate is closed。
The tube valve controls the cavity in both membranes and pistons。
The membrane control cavity is applied to low-pressure tubes, which are responsive and do not resemble piston and the media impurities may be stuck in many times。
Pistol control cavities are applied to high-pressure pipes, with long useful life and easy maintenance。
V. Hd741x liquid control slow-out to return the butterfly valves。
The liquid-controlled slow-down bow valves are mainly installed at the importation of water turbines to be used as tanker import valves or at the exit of pumps from various pumping stations, such as hydro, electricity, drainage, etc. At work, work is done in conjunction with the conduit host to achieve speed-repeated circuits and cut off both functions. The 70-degree fast closing before closure and the 20-degree slow closing. Effective removal of piped hammers and security of the system. Electrical control via plc, valves can reach dn5000 and pressure pn40。
There are mainly electrical control devices, liquid control devices and three components of the butterfly valve. It is divided into two types: a heavy hammer-type liquid-controlled slow-cut-backing valve and an energy-capable liquid-controlled slow-down-backing valve。
Heavy hammer-controlled liquid slow-down returns to the valve axle with a heavy hammer, and the open valves drive the piston valves through hydraulic fluids and lift the hammer together. When the valves are closed, the hammer goes down, leading to the closure of the butterfly plate。
Both the energy-controlled slow-down bow valves and the switch are switched to the electromagnetic valves, the hydraulic fluids are moved into the direction of the hydraulic cylinders, the valves are switched on, and the hammer structure is replaced by an energy collector, which is smaller and less heavy. Gradually, the hammer structure was replaced。
