How can consumers easily and effectively identify imported floors? According to industry insiders, there are mainly three types of imported products currently on the market, which can be identified by some simple methods. Counterfeit factory import Performance: With the original imported logo, it cannot provide original product related information. Identifying methods: The most direct way is to go online. Open the product tab, often found that each brand has a foreign original website. Feel free to visit one of the foreign websites to see if the product packaging and product design is the same as the home page, especially if it is sold in the store. Then click on the distributor's local distributors page to see which company is the general agent in China. Finally searching for any of the foreign brands, you may find that there are hundreds of pages in the search results, there may be local flooring associations, and foreign stores. If you really don't trust, you can also call the foreign company directly to inquire. It is best to find a classified website to ask European distributors to find out if they are selling the same products you saw in China. Counterfeit imported products Performance: Both the sale of imported OEM products, but also has domestic manufacturers of OEM products, domestic products as an imported product ride sales. OEM products are common at home and abroad. The main form of expression is that merchants commission large factories to produce products and then paste their own brand names. Identification method: This holds a certain proportion in domestic laminate flooring brands, and the price difference between brands is relatively large. In order to fully understand the product information, in addition to asking for business websites and telephones, you can also check the floor sampling results over the years through the website of the Bureau of Quality Supervision to confirm the floor quality. Counterfeit imported brands Performance: Once imported flooring products, but now stopped importing, but still branded the import; or even if there are several samples of foreign brands hanging, when asked, the salesman said there is no inventory, and recommend other domestic customers floor. The most obvious counterfeit is fake packaging to deceive customers. Discrimination method: This kind of situation is an individual phenomenon. Consumers can tell whether they are genuine or not by asking them carefully during the purchase process. In addition, check the consistency of the date, factory name, factory, and other laser markings on the back of each floor. The important part of wooden floor purchase is to learn to see the test report of wooden floor. Qualified product testing report can be regarded as a permit to enter the market. The value of various indicators on the test report can also indicate the quality of the product. Wang Yong, general manager of Dehejia Wood Co., Ltd., prompts that consumption should be measured through the inspection report. Able to understand whether the purchase of wood flooring is worthy of name, whether there is exaggeration or false propaganda phenomenon. How to identify the authenticity of the test report: 1. Pay attention to whether or not the riding stitch is the same as the name of the inspection unit and the accreditation number of the unit above the national or provincial level. You can check the authenticity of the relevant government agency website. 2. Note whether the number on the cover of the report is consistent with the product number indicated in the inner core; whether it is within the validity period (usually one year). 3. The test report should have conclusive observations, and consumers should also make sellers promise that the test reports they provide are qualified and formal. 4. For some parameters that will be involved in the floor quality inspection report, there are corresponding levels of product indicators in the standard report, which must be analyzed accordingly. 5. Each year, the state conducts quality inspections on the floor market and publishes the results. When purchasing, they can ask the merchant for the latest national sampling inspection report. 6. Some irresponsible manufacturers will not be certified and will also have the environmental label printed on the brochure. Therefore, it is necessary to look at the copy of the certification material or test report and the certification number, and check it online when necessary. Floor purchase A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a spherical ball. In some ball check Valves, the ball is spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal. The interior surface of the main seats of ball check valves are more or less conically-tapered to guide the ball into the seat and form a positive seal when stopping reverse flow. Check Valves, Water Check Valves, Brass Check Valves, Sanitary Check Valves ZHEJIANG KINGSIR VALVE CO., LTD. , https://www.kingsirvalves.com
Ball check valves are often very small, simple, and cheap. They are commonly used in liquid or gel minipump dispenser spigots, spray devices, some rubber bulbs for pumping air, etc., manual air pumps and some other pumps, and refillable dispensing syringes. Although the balls are most often made of metal, they can be made of other materials, or in some specialized cases out of artificial ruby. High pressure HPLC pumps and similar applications commonly use small inlet and outlet ball check valves with both balls and seats made of artificial ruby, for both hardness and chemical resistance. After prolonged use, such check valves can eventually wear out or the seat can develop a crack, requiring replacement. Therefore, such valves are made to be replaceable, sometimes placed in a small plastic body tightly-fitted inside a metal fitting which can withstand high pressure and which is screwed into the pump head.
There are similar check valves where the disc is not a ball, but some other shape, such as a poppet energized by a spring. Ball check valves should not be confused with Ball Valves, which is a different type of valve in which a ball acts as a controllable rotor to stop or direct flow.
A diaphragm check valve uses a flexing rubber diaphragm positioned to create a normally-closed valve. Pressure on the upstream side must be greater than the pressure on the downstream side by a certain amount, known as the pressure differential, for the check valve to open allowing flow. Once positive pressure stops, the diaphragm automatically flexes back to its original closed position.
A swing check valve or tilting disc check valve is check valve in which the disc, the movable part to block the flow, swings on a hinge or trunnion, either onto the seat to block reverse flow or off the seat to allow forward flow. The seat opening cross-section may be perpendicular to the centerline between the two ports or at an angle. Although swing check valves can come in various sizes, large check valves are often swing check valves. The flapper valve in a flush-toilet mechanism is an example of this type of valve. Tank pressure holding it closed is overcome by manual lift of the flapper. It then remains open until the tank Drains and the flapper falls due to gravity. Another variation of this mechanism is the clapper valve, used in applications such firefighting and fire life safety systems. A hinged gate only remains open in the inflowing direction. The clapper valve often also has a spring that keeps the gate shut when there is no forward pressure. Another example is the backwater valve (for sanitary drainage system) that protects against flooding caused by return flow of sewage waters. Such risk occurs most often in sanitary drainage systems connected to combined sewerage systems and in rainwater drainage systems. It may be caused by intense rainfall, thaw or flood.
A stop-check valve is a check valve with override control to stop flow regardless of flow direction or pressure. In addition to closing in response to backflow or insufficient forward pressure (normal check-valve behavior), it can also be deliberately shut by an external mechanism, thereby preventing any flow regardless of forward pressure.
A lift-check valve is a check valve in which the disc, sometimes called a lift, can be lifted up off its seat by higher pressure of inlet or upstream fluid to allow flow to the outlet or downstream side. A guide keeps motion of the disc on a vertical line, so the valve can later reseat properly. When the pressure is no longer higher, gravity or higher downstream pressure will cause the disc to lower onto its seat, shutting the valve to stop reverse flow.
An in-line check valve is a check valve similar to the lift check valve. However, this valve generally has a spring that will 'lift' when there is pressure on the upstream side of the valve. The pressure needed on the upstream side of the valve to overcome the spring tension is called the 'cracking pressure'. When the pressure going through the valve goes below the cracking pressure, the spring will close the valve to prevent back-flow in the process.
A duckbill valve is a check valve in which flow proceeds through a soft tube that protrudes into the downstream side. Back-pressure collapses this tube, cutting off flow.
A pneumatic non-return valve.
Multiple check valves can be connected in series. For example, a double check valve is often used as a backflow prevention device to keep potentially contaminated water from siphoning back into municipal water supply lines. There are also double ball check valves in which there are two ball/seat combinations sequentially in the same body to ensure positive leak-tight shutoff when blocking reverse flow; and piston check valves, wafer check valves, and ball-and-cone check valves.