One year's plan is in spring. Many friends who have already purchased a house want to start decorating their small homes in the spring, and the floor is one of the biggest links in home improvement spending. Facing the domestic and foreign floor brands of different sizes, different material varieties, and different floor prices, consumers are mostly looking at the flowers and know what to do. The spring decoration due to seasonal factors, some special attention to the place, while many of the rush to the spring decoration are on-demand occupancy of friends, the environmental health of building materials also need special attention. Xiao Bian has specially collected environmental protection floor materials for friends who are decorating in the spring. I believe that it can help you build a more healthy and comfortable home. Green wood flooring has become the home decoration selection trend, each floor company's slogans have more mystery, for the average consumer, does not have the ability and skills of professional purchase, how to ensure that they choose in the decoration of real environmental protection, Safe wood floors, according to experts from the National Indoor Environmental Pollution Control Guidance Center, the country has a lot of hard indicators such as formaldehyde content for "green environmental protection" wood flooring. At the same time, there are specialized green product certification agencies, and only products certified by authoritative professional organizations can be called “green environmental protectionâ€. Advising consumers to choose a healthy and environmentally friendly floor can be evaluated from the following points: 1. National-level professional certification standards: At present, China's current domestic environmental protection standards certification includes the certification of “using advanced international standard products†and “China Environmental Label Certification†which are environmental protection national certifications, among which “adopt advanced international standard product certificationâ€. "The flooring manufacturers pass the most stringent certification of the environmental protection series, and consumers should conduct key verifications on the logos recognized by these countries at the time of purchase." At present, some community organizations are also issuing various environmental protection standard certifications, but it is difficult to become a yardstick for measuring environmental protection products because of their lack of authority, unfair distribution standards, and inadequate supervision of products. 2.Technical support and product quality: "The amateurs watch the excitement and the insiders look at the doorway." Before purchasing the floor products, check the qualifications of relevant manufacturers and the production system certification, which can effectively guarantee that consumers can buy genuine environmental protection flooring products. 3, look at the brand: the flooring market, an endless stream of various brands, industry experts recommend from the brand history, after-sales commitments and other aspects of inspection to choose the floor brand. 4, look at the product line and related parameters: the major brands have their different product lines, not all products are the highest environmental protection level. Remove the floor itself contains formaldehyde will cause indoor pollution, the industry experts also remind consumers to choose the floor, can not ignore the installation problem. If the installation is not standardized, it will also affect the environmental protection. In addition, if the adhesive in the floor does not meet the standard, it will cause indoor formaldehyde pollution. Therefore, while choosing wood floors with good environmental performance, consumers should also pay attention to choosing floor brand dealers with long-standing brand reputation so as to ensure the comfort and health of the home environment from all aspects. Flooring purchase Nature Flooring Del Floor Interior Decor Formaldehyde Home Furnishing Home Price Function Sofa Bed Function Sofa Home Furnishing Home Improvement Home Furnishing 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
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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.