Petrochemical industry in the national economy occupy a very important position, chemical process pump as a key ancillary equipment is also more and more people's attention. Due to the complex nature of the chemical medium, coupled with the continuous improvement of user requirements, as a manufacturer, how to choose, should focus on what aspects? It is particularly important. Here are some of the options for chemical pump common problems: Corrosion resistance All along, corrosion is the most troublesome chemical equipment, one of the hazards, a slight carelessness, ranging from damage to equipment, heavy cause accidents and even lead to disaster. According to the statistics, about 60% of the destruction of chemical equipment is caused by corrosion. Therefore, the selection of chemical pumps should first pay attention to the scientific material selection. There is often a misunderstanding that stainless steel is a "universal material," no matter what the media and environmental conditions are held out of stainless steel, which is very dangerous. First, the selection of chemical process pump points 1. Sulfuric acid as a strong corrosive medium, sulfuric acid is an important use of a wide range of industrial raw materials. Different concentrations and temperatures of sulfuric acid on the corrosion of materials vary greatly, for the concentration of more than 80%, the temperature is less than 80 â„ƒ of concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid, Not suitable for pump valve material; common stainless steel such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) sulfuric acid medium is also limited use. Therefore, the delivery of sulfuric acid pump valve usually adopts high silicon cast iron (casting and processing difficult), high alloy stainless steel (20 alloy) manufacturing. Fluoroplastic has good resistance to sulfuric acid, the use of fluorine pump (F46) is a more economical choice. Applicable products are: IHF lining pump, PF (FS) strong corrosion-resistant centrifugal pumps, CQB-F Fluorine plastic magnetic pump. 2. Hydrochloric acid solution Most of the metal materials are not resistant to hydrochloric acid corrosion (including a variety of stainless steel), molybdenum high ferrosilicon can only be used for 50 â„ƒ, 30% hydrochloric acid. In contrast to metallic materials, the vast majority of non-metallic materials have good corrosion resistance to hydrochloric acid, so lined rubber pumps and plastic pumps (such as polypropylene, fluoroplastic, etc.) is the best choice for the delivery of hydrochloric acid. Applicable products: IHF lining pump, PF (FS) strong corrosion-resistant centrifugal pumps, CQ polypropylene magnetic pump (or fluorine plastic magnetic pump). 3. Nitric acid Most metals are mostly corrosive in nitric acid corrosion damage, stainless steel is the most widely used nitric acid-resistant materials, all concentrations of nitric acid at room temperature have good corrosion resistance, it is worth mentioning that the molybdenum-containing stainless steel (such as 316,316 L) corrosion resistance to nitric acid is not only not superior to ordinary stainless steel (such as 304,321), and sometimes even worse. For high temperature nitric acid, usually titanium and titanium alloy materials. The company applies products: DFL (W) H chemical pump, DFL (W) PH shield chemical pump, DFCZ process pump, DFLZP self-absorption chemical pump, IH chemical pump, CQB magnetic pump, 4. Acetic acid It is one of the most corrosive substances in organic acids. Ordinary steel will be seriously corroded in all concentrations and temperatures of acetic acid. Stainless steel is an excellent acetic acid-resistant material. Molybdenum-containing 316 stainless steel is also suitable for high temperature and Dilute acetic acid steam. For high temperature and high concentration of acetic acid or other corrosive media containing harsh requirements, the choice of high-alloy stainless steel or fluorine plastic pump. 5. Alkali (sodium hydroxide) steel is widely used in sodium hydroxide solution below 80 â„ƒ, 30% concentration, there are many factories at 100 â„ƒ, 75% below the ordinary steel is still used, although the corrosion increases, but the economy is good . Ordinary stainless steel lye corrosion resistance compared with cast iron has no obvious advantages, as long as the medium allows a small amount of iron mixed with stainless steel is not recommended. For high temperature alkaline use of titanium and titanium alloy or high alloy stainless steel. The company generally cast iron pump can be used for low temperature lye concentration, special requirements can be used when all kinds of stainless steel pump or fluorine plastic pump. 6. Ammonia (ammonia hydroxide) Most metals and non-metals in liquid ammonia and ammonia (ammonia hydroxide) corrosion are minor, only copper and copper alloy should not be used. Most of the company's products for ammonia and ammonia transport. 7. Saline (seawater) Common steel corrosion rate in sodium chloride solution and seawater, salt water is not too high, the general shall be used paint protection; various types of stainless steel also have a low uniform corrosion rate, but may be due to chloride ions caused by the local Corrosion, usually 316 stainless steel is better. 8. alcohols, ketones, esters, ethers Common alcohol mediums are methanol, ethanol, ethylene glycol, propanol, ketones have acetone, butanone and so on, the ester medium has a variety of methyl esters, Ethyl ether, ethers medium ether, ether, butyl ether, they are basically non-corrosive, common materials are applicable, the specific selection should also be based on the media properties and related requirements to make a reasonable choice. It is also noteworthy that ketones, esters, ethers are soluble in a wide variety of rubbers and avoid mistakes when selecting sealing materials. There are many other media can not be introduced in this one, two, chemical process pump cooling problem of high temperature medium transport pump structure, materials and auxiliary systems put forward higher requirements, the following talk about different temperature changes on the cooling requirements And the company applies to the pump: 1. For the temperature below 120 â„ƒ medium, usually do not set a special cooling system, use more of their own medium for lubrication and cooling. DFL (W) H chemical pump, DFL (W) PH shield chemical pump (class H should be used for shielded motor over 90 â„ƒ); DFCZ common type and IH chemical pump can make the temperature Up to 140 â„ƒ ~ 160 â„ƒ; IHF lined with fluorine pump up to a maximum temperature of 200 â„ƒ; only CQB ordinary magnetic pump temperature does not exceed 100 â„ƒ. It is worth mentioning that for the easy-to-crystallize or media containing particles should be equipped with a sealing surface flushing pipe (design have left interface). 2. For media above 120 Â° C and within 300 Â° C, a cooling chamber is normally to be provided on the pump cover, and the seal chamber is also to be filled with coolant (to be fitted with a double-ended mechanical seal). When coolant is not allowed to penetrate the medium , It should be taken after the cooling medium itself access (through a simple heat exchanger). The company has DFCZ chemical process pump, GRG high temperature pipeline pump and HPK hot water circulation pump (under development) to choose from, the other CQB-G high temperature magnetic drive pump can be used within 280 â„ƒ high temperature medium 3. For more than 300 â„ƒ Of the high temperature medium, not only need to cool the pump head part, the suspension bearing chamber should also be equipped with cooling system, the pump structure is generally the central support form, the mechanical seal is best to use metal bellows type, but the price is high (the price is normal mechanical seal 10 times). There are currently DFAY centrifugal pump temperature can reach 420 â„ƒ (under development). Third, the chemical process Pump sealing problem No leakage is the pursuit of chemical equipment, it is this requirement has led to the growing application of magnetic pumps and shielded pumps. However, there is still a long way to go without leakage, such as the life span of the magnetic pump isolation sleeve and shielding pump shielding sleeve, the material pitting problem, the reliability of static sealing, and the like. Now on the sealing of some of the basic situation is briefly described as follows: 1. Seal For the static seal, seal and seal are usually only two forms, and O-ring seal again the most widely used; for the dynamic seal, chemical Pumps rarely use packing seals, mainly mechanical seals, mechanical seals have a single end and double end, balanced and unbalanced points, balanced for high pressure medium seal (usually refers to the pressure greater than 1.0MPa), double End machine seal is mainly used for high temperature, easy to crystallize, viscosity, containing particles and toxic volatile medium, double seal should be injected into the sealed chamber isolation fluid, the pressure is generally higher than the media pressure 0.07 ~ 0.1MPa. 2. Sealing material Chemical pump static sealing materials generally use fluorine rubber, special circumstances only use PTFE material; mechanical seal ring static material configuration is more critical, not cemented carbide is the best on the cemented carbide, the price is high On the one hand, there is no hardness difference between the two is not reasonable, so the best treatment according to the characteristics of different media Fourth, the viscosity of the chemical process of the viscosity of the medium Viscosity of chemical process pump performance is great, when the viscosity increases, the pump The head curve drops, the head and flow of the best working condition both fall, and the power rises accordingly, thus the efficiency is reduced. General parameters on the sample are the performance of the transport of water, when the transport of viscous media should be converted (different viscosity correction factor can be found in the relevant conversion chart). For the viscosity of pulp, paste and viscous liquid delivery, the proposed selection of screw pump, the company DFGG single screw pump medium viscosity up to 1000000cst.
10W Mini Glue Gun Ptc Heating Features:
4. Proective Nozzle Cover
5. Trigger Flow Control
6. Bonds instantly
7. High quality
8. High temperature or low temperature
Idea for many applications. Fastening various materials such as paper, cardboard, fabric,wood, lace,trims,leather,metal,glass, tiles, rubber, ceramics and flooring etc. Ideal for hobby and household repair,DIY&craft projects.
Designed and manufactured to the highest of
standards to ensure a robust and long life, we hope it provides you with many
years of trouble-free, safe and reliable service.
General Safety Information:
if the plug cord was in good condition, and if there is stand before plug into
the electrical outlet ; Check if the used glue gun has glue flow through back
of the tunnel;
5-10 minutes to allow glue to soften, stand up the glue gun on the table when
not in use;
nozzle to any clean, dry surface you wish to bond, to avoid any impurity stop
4. If the glue could not flow from the nozzle when
the glue gun start to work, check if the glue gun are heating;
gun can not be heated, there are following reasons:
Plug cord into electrical outlet not
Glue gun has been destroyed owing to
inner cord short circuit;
gun can be heated, there are following reasons: Nozzle has been stopped by any
impurity, ask careerman to manage it.
5. Do not use the glue gun
under moist climate, humidity will affect insulation and cause electric shock;
6. Do not touch the nozzle
or melted glue;
7. Do not remove out the melted glue stick from
the tunnel back side, it will damaged the glue gun as well as scalding person
8. Do not to disassemble or assemble any glue
gun accessories freely, it will cause glue gun do not work properly;
9. Keep out of reach of children and stocked it
beyond any of Children palpable side;
10. Only used for melting glue stick, no other
11. When in use, there are any glue flow back
from tunnel, stop using immediately, wait for careerman clean the glue;
12. Close the power if the glue gun not in use
after 15 minutes;
Before use the glue gun, check
if the plug cord into electrical
2ï¼Ž When glue gun
in first use, the heating element will have small smoke, it is normal
situation, but the smoke will disappeared after 10 minutes;
3ï¼Ž After power,
not for a long time in standby mode(not longer for 20 minutes), when the
suspension of use, unplug first.
4ï¼Ž Avoid to use
the glue gun under very hot or very cold environments.
5ï¼Ž Better not
work under direct cold wind blowing, it will reduce efficiency and loss power
6ï¼Ž When in
continuous using, do not press the trigger with great pressure, and try to
squeeze out the un-melted glue, it would damage the glue gun
applicable for bonding heavy objects or objects needed strong adhesive
8ï¼Ž The quality
of glue stick will directly influence the glue gun function and sticking
9ï¼Ž If the
power cord is damaged, do not replace it by yourself, must ask for
professionals to replace it.
10ï¼Ž This tools must b e placed in its position when
not in use. And storage before the tools complete cooled.
11ï¼Ž Be careful when using any other electrical appliance
with flammable material.
12ï¼Ž Not applicable for a long time in the same
13ï¼Ž Do not use an explosive gas atmospheres.
14ï¼Ž Note that heat may be the line of sigh, combustible
15ï¼Ž Do not leave equipment unattended when switched
16ï¼Ž This appliance is not intended for use by
persons(including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a person
responsible for their safety.
17. Children should be supervised to ensure that
they do not play with the appliance.
1. Glue gun
using voltage is 110-220V AC,50/60Hz;
2. Tip gun
forward on stand and place a piece of cardboard under the nozzle
3. Use 7-8mm
(mini trigger glue gun), 11-12(big trigger glue gun), insert glue sticks
tunnel at back of gun
4. After power,
wait for 5-10 minutes to allow glue to soften
After glue softens, squeeze
trigger to feed glue through glue barrel. Excessive force will damage glue gun.
Put down nozzle after work, disconnect the power plug
Mini Glue Gun
10W Mini Glue Gun, Mini Glue Gun, Small Glue Gun, Electric Glue Gun
Ningbo Kingvos Electrical Appliance Co.,Ltd , http://www.kingvos.com