How can I reduce the urban noise pollution in my home? Nowadays, choosing some effective soundproofing materials as doors and windows (fittings renderings) to "arm" their own houses has become a concern of many citizens. There are many kinds of sound insulation materials, and there are roughly three kinds of sound insulation materials on the market today: Insulating glass is composed of two or more layers of flat glass, and two or more pieces of glass and aluminum alloy are surrounded by a high-strength, airtight composite adhesive. The frame or rubber band is glued, leaving space between the sealing glass, filled with inert gas to obtain excellent thermal insulation properties. Due to the poor heat transfer performance of air or gas trapped in the glass, superior sound insulation results. Laminated glass refers to the PVB interlayer film sandwiched between two or more sheets of glass. PVB interlayer can reduce the amount of noise that penetrates the glass, reduce noise decibels, and achieve sound insulation. Sound-absorbing decorative board is a new building material, with excellent sound-absorbing properties and flame-retardant and fire-retardant effects. Generally, there are a variety of colors and pattern decorative cloths to choose from, and some products can also be processed into various shapes of sound-absorbing body according to design requirements. Plastic, aluminum alloy doors and windows features According to people in the industry, the soundproofing performance of plastic-steel doors, windows, and windows is determined by the degree of closeness between the two windows and between the window and the window frame, and the opening of the window is determined by the closeness of the closed window and the frame. General use of rubber seals, and ordinary aluminum alloy windows, "hard hit hard" different sound effects are more obvious. Now plastic steel doors and windows of various styles, in addition to the traditional inside and outside the flat open, push and pull type and folding, there are open inside the flat hanging window, push and pull the hanging doors and windows, sliding under the hanging doors and windows and other styles. The common plastic steel doors and windows on the market are mostly white, but color profiles also appear. The sealing of plastic doors and windows is good, ensuring the soundproofing effect, but at the same time it also brings the weakness of insufficient air circulation. In view of this situation in the market, ventilators used when closing windows have been developed, which do not affect the sound insulation but also ensure the exchange of indoor and outdoor air. Ventilators can be installed between windows and window lines and do not take up space. Most people think that the soundproof effect of aluminum alloy doors and windows is not good, but in fact, the new aluminum alloy doors and windows have made a great improvement in the sealing noise performance. The sound insulation performance of the window mainly lies in the sound insulation effect of the glass occupying about 80% of the area, followed by the sealing performance of the doors and windows. Some aluminum alloy doors and windows products in the market today adopt different glass composite structures to enhance the sound insulation effect. In terms of airtightness of doors and windows, the use of high-quality rubber strips and plastic sealing accessories has also largely solved the problem of poor sealing performance of aluminum alloy doors and windows. Knowledge of building materials Doors to buy Doors and windows Window glass Aluminum alloy Home space Interior decoration renderings Marriage room Decoration renderings House decoration renderings Home decoration renderings Glass door Decoration Home 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.