Three-screw pump is the use of screw rotation to suction and discharge liquid, due to the mutual engagement of the screw and the screw and the inner wall of the liner in close cooperation between the suction and discharge of the pump will be separated into one or more seals space. Three screw pump is widely used in petroleum, electricity, chemical fiber, shipbuilding, metallurgy, glass, machinery, machine tools, highways and other industries. Suitable for conveying lubricating oil, hydraulic oil, lubricating oil, asphalt, crude oil and other similar lubricants. For intermittent operation, high pressure, low viscosity, poor lubrication media, or similar media, the actual pump life will be shortened. We recommend to check every once in a while, and its working conditions are within the specified range. 1. Startup (1) Before starting the inspection of all pipe flanges, joints tightness, tight leak. (2) Turn the coupling to check whether the rotation of the pump is flexible. If there are other problems such as jamming, remove the pump. (3) The first start should unscrew the safety valve refueling screw plug or remove the cover, injecting liquid into the pump and hand counterclockwise rotation of the coupling to ensure that the friction pairs have sufficient lubrication. (4) Before starting, all the valves in the suction and discharge lines should be opened completely, and it is forbidden to start the valve. Check motor rotation is correct. (5) After the preparation is completed, can be connected to the power, direct start. 2. Stop screw pump must not shut down into the outlet valve shut down. If heavy fuel oil, asphalt and other highly viscous media are to be transported, the pump thermal insulation valves 1, 2 should be opened to keep the temperature of the pump after the standby pump is shut down. This will prevent the pump or motor from being damaged immediately when the emergency starts. 3. MAINTENANCE (1) If the sound of the pump and the motor is abnormal (or the current meter pointer rises rapidly), stop immediately to find out the cause. (2) The outlet pressure must not exceed the pressure shown on the pump's nameplate. (3) Safety valve has been adjusted before production, can not be arbitrarily mobilized. (4) If the pipeline system fails, there should be a safe return to stop troubleshooting immediately. General safety valve reflux time shall not exceed three minutes. If the pump is too long, the pulse wave generated by the returning fluid will cause the pump to vibrate and even cause the pump to "bite". (5) drip leakage at the shaft seal is a normal phenomenon, such as oil leakage greater than 10 ml / hour, should stop troubleshooting or replace the new seal components. (6) In the circuit controlling the operation of the motor, there should be overload protection components. Such as pump "biting dead", should cut off the power automatically, in order to prevent the electrical machinery to burn out.
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Screws are threaded fasteners that create permanent or temporary assemblies. They are inserted and removed by turning in one direction or another. Wood screws, floor screws, and sheet metal screws have flat heads that sit flush when holding material together. Machine screws fasten metal to metal and are inserted into a prethreaded hole or mated with a nut. Thread-cutting screws are self-tapping screws that cut away and remove the surrounding material to create a tapped hole. Deck screws resist rust and corrosion to hold outdoor decking materials together. Drywall screws have fine tips, coarse threads, and tapered bugle heads to penetrate drywall and grip wood without damaging material. Hex-head bolts, cap screws, and lag screws are driven with wrenches rather than screwdrivers or drill bits. Captive panel screws and thumb screws can be tightened and loosened without tools on parts that are frequently removed such as access panels. Screw caps can help to cover screw heads for both safety and aesthetic purp
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