A structure of a decompression backflow preventer is introduced. The decompression part of the device is improved in design, the piston is used instead of the diaphragm, the problem that the diaphragm is difficult to be processed and the product life is not long is solved, and the reaction force of the diaphragm is eliminated , Improve the qualified rate of a product assembly. 1, Overview Vacuum backflow preventer (hereinafter referred to as backflow preventer) as a valve to prevent backflow of dirty water in the branch back to the trunk road, the application is very common in developed countries such as Europe and the United States. In China, to prevent water back mainly using ordinary check valve, backflow preventer is not the application of many, in particular 2, the working principle of decompression backflow preventer is operated by two independent check valve composition (Figure 1a ), A differential pressure relief valve is connected between the two valves. These parts can be integrated into a valve body, can also be made as a separate part. The two ends of the check valve are also directly connected to the two ball valves for service (> dn50 usually gate valve), in addition there are four elastic seal test ball valve to form a complete decompression backflow preventer. In the case of normal water supply, the main water pipe from the inlet position of the check valve through the decompression zone to the exit position on the outlet of the check valve to the user water supply, the inlet position of the check valve inlet high-pressure water through decompression The valve diaphragm on the cavity, and the diaphragm under the outlet position and the check valve inlet communication, due to its existence of a certain pressure, to promote the diaphragm to the right, the valve closed, water supply is normal. When the valve after the pipeline without users, the case of static water, such as the inlet pressure remains unchanged, there is pressure before and after the valve was closed. Such as the import pressure drops, before and after the pressure drop to a certain value, the spring push the diaphragm to the left, the relief valve opens the pressure relief, pressure relief and inlet pressure to restore a certain difference, the pressure reducing valve is closed. When the valve after the pipe network pressure rises above the valve inlet pressure, such as the exit position of the check valve seal intact, high-pressure water will not backflow, the pressure valve around the diaphragm to maintain the original pressure difference, the valve closed Do not leak. When the exit position of the check valve seal damage caused by leakage, the exit position of the check valve before the pressure increases, resulting in pressure reducing valve around the diaphragm decreases, the relief valve opens through the drain pressure relief, at this time, If the position of the check valve at the same time seal damage, as the exit position of the check valve back to the high-pressure water has been pressure relief, it will not back to the inlet position on the check valve. If the water supply pressure in the process of continuous decline, the pressure reducing valve on the left side of the diaphragm, reducing valve control spring to open the valve to open the valve drainage. When the inlet pressure drops to zero or negative pressure, the pressure reducing valve is fully opened to discharge water, and the air enters the vacuum chamber through the pressure reducing valve to prevent siphon backflow. Before and after the decompression backflow preventer installed in each chamber with four test faucets, the valve can be detected and maintained, you can also check the pressure in each chamber is normal, the check valve is invalid. In addition, before and after the valve is equipped with a switch ball valve, you can control the valve switch, you can also in the case of valve failure, do not remove the valve to replace the internal parts and cleaning. 4 Conclusion Improved decompression backflow preventer structure is simple, simple processing technology, low cost, long service life, a qualified assembly rate, stable performance, with some market competitive advantage.
Automatic Door Kits
Our automatic door kits include 1 motor+gear reducer, 1 belt,7 meter, 1 idle pulley, Microprocessor, 4 sets of carriage blue wheels, 2 sets of floor guides,2pcs remote control, 2 sets belt clamp mounting brackets, 1 power supply harness and cable connectors, 2 locator, Aluminum track whose length is 2.08 meter, 3 meter, or 4 meter.
We are a manufacturer of automatic door openers that are designed to provide people convenience. Automatic Door Systems` drive to provide that level of service is but one of the reasons why automatic doors are becoming more and more popular. Our Automatic Sliding Door systems are modern, space-saving and elegant.
Automatic sliding doors have many basic functions some of which include: automatic mode with full opening width and/or reduced opening width, and exit only for traffic control. The opening of automatic doors can also be adjustable to make the opening width smaller or larger. Important safety functions such as safety sensors prevent the door from shutting if persons or objects are in the detection zone. If the door leaves are inhibited when closing, they are immediately re-opened or if the door leaves are hindered when opening, they are immediately stopped by a safety automatic reversing mechanism.
Our most popular sliding automatic door. Think of this as the go-to door for everyday automation needs. All components fully tested and pre-assembled at factory for fast, trouble-free installation.
Applications: Retail, healthcare, airports, hospitality, clean rooms. Shenzhen Hongfa Automatic Door Co.,Ltd rated door is designed, test and certified to meet your environment needs. automatic slide doors for industrial, commercial, healthcare, and retail use. You will find our automatic sliding doors throughout in a wide variety of locations, including: Hospitals, Airports, Retail centers, Pharmacies, Hotels, Grocery stores, Hardware stores, Sporting goods stores, and more.
Automatic Sliding Doors can either be a single door sliding in one direction or bi-parting doors where each door leaf slides in the opposite direction. They are often used in grocery stores, entrances to shopping malls, hospitals and other applications where you want to provide your customers a hands free, safe and easy access to your building.In addition, one of the biggest benefits of automatic doors is energy savings. Since these doors only open when someone comes in or out of your building, it prevents the loss of energy when a door may otherwise be left open for a long time.
The control device of sliding automatic door contains basic function and extensional function, automatic operation / hold-open/closed/half-open to meet customer needs. Electric sliding door controller has multiple interfaces for complete access control systems for keeping your life and property more safety. Such as: safety beam photocell, electric locks, sensor etc. Its drive devices adopts European technology to integrate motor with gear box, which offers strong driving and reliable operation and increased power output , it can adapt to a large door.
Providing strength, beauty, and technology all in one package, Hongfa's line of automatic sliding doors provides entrance solutions for practically any application. An exclusive feature is Hongfa's sound-dampening track reducing operational noise to a mere whisper and stops vibration resonance that can be transferred to the building structures.
Automatic Door Kits,Automatic Sliding Door Opener,Automatic Sliding Door Operator,High Performance Automatic Door Kits
Shenzhen Hongfa Automatic Door Co., Ltd. , https://www.spiralfastdoor.com