Remember to keep these points in mind when installing valves

Many valves have a direction, such as cut-off valve, throttle valve, pressure relief valve, check valve, if installed it will affect the use effect, and the life of the throttle valve), or no effect (such as valve), even dangerous (such as check valve) valve, valve body in the direction signs; if not, the valve should be based on the working principle, the correct recognition. Valve around the valve chamber asymmetry, fluid to make its bottom up through the valve port, so fluid resistance (determined by the shape), open the effort (due to media pressure up), after the closure of medium pressure packed, easy to repair, this is why the cut-off valve is not an anti sense other valves also have their own the characteristics of. Valve mounting position must be convenient for operation. Even if the installation of temporary difficulties, but also for the sake of long-term operating personnel work best valve handwheel and chest even (1.2 meters above the operating floor general), so that the valve is opened and closed more fresh. Landing valve handwheel should be upward, do not tilt, so as not to operate awkwardly. On the wall by the valve device, but also leave Chucao personnel standing room to avoid his back operation, especially pH, toxic media, otherwise it is not safe. The gate should not be inverted (i.e. handwheel down), otherwise the medium will remain in the bonnet space for a long time. It will corrode the valve stem and be contraindicated in some process requirements. It is very inconvenient to change the filling at the same time. Open rod gate valves are not installed in the ground, or exposed to the stem because of moisture. Lift check valve, installation to ensure that the valve vertical, so as to rise flexible. Swing check valve, installation to ensure that the level of its pin, so as to open flexible. The pressure relief valve should be erect and mounted on a horizontal pipe, not inclined in all directions.

Some valves need external protection, which is heat preservation and cold protection. Sometimes the hot steam line is added to the insulating layer. What kind of valve should be heat or cold, according to the requirements of production and principle that, where the medium in the valve reduces the temperature too much, will affect the production efficiency or frozen valve, you need insulation, even the hot mix; where the valve is exposed, the production caused by frost and other adverse or undesirable phenomenon, you need to. Cold. Thermal insulation materials are asbestos, slag cotton, glass wool, perlite, diatomite, vermiculite, etc., cold preservation materials are cork, perlite, foam, plastic and so on

Some valves, with the exception of necessary protective facilities, also have bypass and instrumentation. Bypass is installed. Easy to trap valve overhaul. Other valves also have bypass installed. The installation of bypass depends on valve condition, importance, and production requirements.

Stock valve, and some packing has been bad, and some use media does not match, which requires change of packing. Valve manufacturers can not consider the use of units of 1000 million class of different media, stuffing box is always loaded with ordinary packing, but the use of the media must be allowed to adapt to the medium.

When changing the packing, press it round and round. The lap of each lap shall be 45 degrees, and the circle shall be joined with 180 degrees of circle. Fill height should consider the gland continue to compress the room, and now let the lower gland pressure packing room proper depth, this depth is generally for filling room total depth of 10-20%. For high pressure valves, the seam angle is 30 degrees. The joint between the ring and the circle is staggered by 120 degrees. In addition to the filling, but also according to the specific circumstances, the use of rubber O ring (natural rubber resistance 60 degrees below the base, NBR resistance 80 degrees below the oil crystal, fluoroelastomers 150 degrees Celsius corrosive medium) three stacked PTFE ring (200 degrees Celsius strong resistance to corrosion medium nylon bowl ring (resistance) at 120 degrees Celsius ammonia alkali) into the filler. Outside the ordinary asbestos packing, a layer of Teflon raw tape is wrapped, which can improve sealing effect and reduce the electrochemical corrosion of the valve stem.

When pressing the sauce, turn the valve stem at the same time to keep it all round and prevent the dead. Tighten the gland tightly and don’t tilt.