How to solve the sealing problem can not be ignored, because the valve running, running, dripping, leakage phenomenon, the vast majority occur here. Dynamic seal sealing of the valve, mainly refers to the stem seal. Do not let the valve medium with the stem movement and leakage, the valve is the center of the subject of dynamic sealing. Stuffing box form At present, the valve dynamic seal to stuffing box based. The basic form of stuffing box is: (1) gland type This is the most used form. The same form can distinguish many details. For example, from the compression bolts, can be divided T-bolts (for pressure ≤ 16 kg / cm2 of low-pressure valve), studs and bolts and so on. From the gland, can be divided into the overall and combined. (2) compression nut type This form, small size, but the pressure is limited, only for small valves. Packing stuffing box, with the filler and the stem direct contact and filled with stuffing box, to prevent media leakage. The following requirements on the packing: (1) good sealing; (2) corrosion resistance; (3) small coefficient of friction; (4) to adapt to the media temperature and pressure. Commonly used fillers are: (1) Asbestos packing: Asbestos packing, temperature and corrosion resistance are good, but when used alone, the sealing effect is poor, so always impregnated or attached to other materials. Oil impregnated asbestos packing: Its basic structure in two forms, one is twisted, and the other is braided. Can be divided into round and square. (2) Teflon braided packing: Teflon braided packing, has excellent corrosion resistance, but also can be used for cryogenic medium. (3) Rubber O-ring: Under low pressure, the sealing effect is good. Use temperature is limited, such as natural rubber can only be used at 60 ℃. (4) plastic molding filler: generally made of three-piece, can also be made into other shapes. Polytetrafluoroethylene plastic used as much, but also with nylon 66 and nylon 1010. In addition, the use of units according to their own needs, often exploring a variety of effective filler forms. For example, in the steam valve at 250 ℃, asbestos packing and lead ring alternately overlap, leakage will be reduced; some valves, the media often change, such as asbestos packing and PTFE tape together , The sealing effect will be better. In order to reduce the friction on the stem, some occasions, you can add molybdenum disulfide (M0S2) or other lubricants. At present, new stuffing is being explored. For example, polyacrylonitrile fiber impregnated with PTFE emulsion, and after pre-oxidation, sintering in the mold compression, can be sealed with excellent performance of the molding filler; Another example is the use of stainless steel sheet and asbestos made of corrugated filler, high temperature resistant High pressure and corrosion. Bellows seal With the rapid development of chemical industry and atomic energy industry, flammable, explosive, highly toxic and radioactive substances increased, the valve seal has been more stringent requirements, in some cases have been unable to use the packing seal, resulting New form of seal - bellows seal. This seal without filler, it is also called no packing seal. Bellows ends, welded with other parts. When the stem lifts, bellows telescopic, as long as the bellows itself does not leak, the media will not be able to escape. To be on the safe side, double seals of bellows and packing are often used. Static seal Static seal is usually the seal between two stationary surfaces. The main method of sealing is the use of gaskets. Gasket material (1) Non-metallic materials: paper, hemp, cowhide, asbestos products, plastic, rubber and other paper, hemp, leather and the like, there are pores, easy to penetrate, when used to be impregnated with oil, wax or other impermeable material . Valve is rarely used. Asbestos products, there are asbestos belt, rope, board and asbestos rubber sheet. Asbestos rubber sheet which compact structure, pressure performance, temperature performance is also very good, the valve itself and the valve and the pipe flange connection, the use of a very wide range. Plastic products, have good corrosion resistance, use is also more common. Varieties of polyethylene, polypropylene, soft PVC, PTFE, nylon 66, nylon 1010 and so on. Rubber products, soft texture, all kinds of rubber, respectively, a certain acid, alkali, oil, sea water resistance. Varieties are natural rubber, styrene butadiene rubber, nitrile rubber, neoprene, butyl rubber, polyurethane rubber, fluorine rubber. (2) metal materials: In general, metal materials, high strength, high temperature resistance. But lead does not, just take it against the characteristics of dilute sulfuric acid. Common varieties are brass, copper, aluminum, low carbon steel, stainless steel, Monel, silver, nickel and so on. (3) composite materials: such as metal foreskin (internal asbestos) washer, combined wave washer, wound washer and so on. Common gaskets performance When using the valve, often according to the specific circumstances, the replacement of the original gaskets. Often have gaskets are: rubber flat washers, rubber O-ring, plastic flat washers, PTFE packing gaskets, asbestos rubber gaskets, metal flat washers, metal washers, metal foreskin washers, wave washers, wound washers and so on. (1) Flat rubber washer: It is easy to deform and work hard without any pressure. However, its pressure resistance and temperature resistance are poor. It is only used for places with low pressure and low temperature. Natural rubber has certain acid and alkali resistance, the use of temperature should not exceed 60 ℃; neoprene can also be resistant to some acid, temperature 80 ℃; nitrile rubber oil, available to 80 ℃; fluorine rubber corrosion resistance is good, resistance Temperature performance than the average rubber, can be used in 150 ℃ medium. (2) Rubber O-shaped washer: the cross-sectional shape is a perfect circle with a certain self-tightening effect, the sealing effect is better than the flat washer and the pressing force is smaller. (3) plastic flat washers: The most prominent feature of plastic is corrosion resistance, most of the plastic temperature performance is not good. PTFE plastic crown, not only excellent corrosion resistance, but also a wide temperature range, can be long-term use within -180 ℃ ~ +200 ℃. (4) Teflon gasket: In order to give full play to the advantages of PTFE, while making up for the shortcomings of its less flexible, made of PTFE coated rubber or asbestos rubber gasket. In this way, both with PTFE flat washer corrosion-resistant, but also good flexibility, and enhance the sealing effect, reducing the pressure. The cross-sectional shape is shown in Figure 4-20. (5) Asbestos rubber gasket: cut from asbestos rubber sheet. Its components are 60 to 80% asbestos and 10 to 20% rubber, as well as fillers, vulcanizing agents and the like. It has good heat resistance, cold resistance, chemical stability, and rich sources, the price is cheap. When used, the pressing force does not have to be great. Because it can adhere to metal, it is best to apply a layer of surface
PH Linear Series
Phlizon is a new high-tech enterprise, specializing in research, production, sales services of LED Grow Light.The headquarters is located in Huilongda Industrial Park, Shilongzai ,Shiyan Street, Baoan District, Shenzhen, China.So far we have overseas warehouses in the United States, Germany, the United Kingdom, and Spain.we strive to provide convenient and highly efficient solution services.
Adopts Samsung LED 5630 as light sources, which has the advantages of high performance, low energy consumption and stability.
Input voltage:AC100-240V,easy to use, safe and suitable for any country.
LED Lifespan is reach up to 50,000 hours.
Suitable for all kinds of plant growth, flowering and yield
Safe and environmental protection, free from pollution and harmful substances
Features:
High power brand Samsung 5630 led with high par vaule
100-277v/200-480v for industrial planting
Higher PPFD value per unit area
Full Spectrum Grow Light mimics natural sunlight for different period of growth
Passive heat sink and die casting aluminum shell
Aluminum body for a good heat-dissipation
Elegant appearance
Easy to install by minute
More convenient and simple for maintenance
Energy saving,environmental
friendly
3-5 Year warranty
Applications
Hydroponics,Horticulture,Agriculture and Greenhouse
Locations:Farm,Exhibition,Garden,Home,Urban,Bonsai,and University Lab
Growth of Fruits,Vegetables,Flowers and so on
Seeding,Rooting,Breeding,Flowering and Fruiting period
Phlizon is the manufacturer factory and we sell our products at a low price directly, besides all our Power supply, Fans and wire all are Fire-resistant material,won't catch fire.
We currently have warehouses in the UK, USA, Canada,Spain, and Australia,and we are working on opening more warehouses in other countries to shorten our delivery time.
We have strong OEM/ODM capabilities, with experienced teams, full post-sales support and an established quality control system.
We promise to provide high-quality products with competitive prices, fast delivery, and responsive services for our clients.
Cautions
1.This light is not waterproof, do not spray water
2.Never touch and hit the Light while it is working.
3.Lighting work environment is -20 ~ 40 °C, 45% ~ 95% RH.
4. Please cut off the power when there is a lightning strike.
5. Make sure that the mounting position can withstand 10 times the weight of the light.
PH Linear Series,Quantum Board Grow Light,Quantum Board Grow Light Kits,Led Quantum Board Grow Light,200W Quantum Board Grow Light
Shenzhen Phlizon Technology Co.,Ltd. , https://www.szledaquariumgrowlight.com
