VALVE

  At present, the commonly used hardening processes for the surface of  metal hard sealed ball valves  mainly include the following: (1) Surface welding (or spray welding) of hard alloy on the sphere can achieve a hardness of over 40HRC. The process of surface welding of hard alloy on the sphere is complex, with low production efficiency, and large area welding can easily cause deformation of the parts. Currently, there is relatively little use of surface hardening technology on the sphere. (2) The surface of the sphere is plated with hard chromium, with a hardness of 60-65HRC and a thickness of 0.07-0.10ram. The chromium plating layer has high hardness, wear resistance, corrosion resistance, and can maintain surface brightness for a long time. The process is relatively simple and the cost is relatively low. However, the hardness of the hard chromium coating will rapidly decrease as the temperature increases due to the release of internal stress, and its working temperatu...

  Check valves   may be the most easily misunderstood valve in history. If you mention check valves to most factory personnel, the typical reaction is "they don't work.". In fact, these personnel are likely to have removed internal components or refurbished the system to avoid using check valves. In other words, these valves may be the least popular valves currently in use. This article will explore the basic knowledge of check valves, how they work, what types they are, how to select and install them, how to solve their problems, and why they are not always problems. Simply put, check valves allow one-way flow and automatically prevent backflow (backflow) when the fluid in the pipeline is reversed. They are one of the few automatic valves that do not require auxiliary opening and closing. Although some valves can be equipped with external counterweights and damping devices in special circumstances, most valves do not have open/close control or external assistance from ot...

  Globe valve , also known as shut-off valve, belongs to the forced sealing type valve and is a type of shut-off valve. There are three types of connection methods: flange connection, threaded connection, and welded connection. The "Three Modernizations" of valves in our country once stipulated that the flow direction of globe valves should be from top to bottom, so there is directionality during installation. The globe valve is designed with low inlet and high outlet to reduce flow resistance and save effort when opening the valve. When the valve is closed at the same time, the gasket between the valve shell and valve cover, as well as the packing around the valve stem, are not subjected to force and will not be affected by medium pressure and temperature for a long time. This can prolong the service life and reduce the probability of leakage. In addition, this can also replace or add packing when the valve is closed, making maintenance easier. In general, globe valves are l...

  Globe valves   are used to cut off the flow of media, and are suitable for situations that require frequent opening. The sealing parts of a globe valve are the valve disc and valve seat. In order to ensure a tight closing of the globe valve, the mating surface of the valve disc and valve seat should be ground or a gasket should be used. The sealing surface can also be embedded with corrosion-resistant and wear-resistant materials such as bronze and stainless steel.The valve disc and valve stem of the globe valve are connected in a movable manner to ensure a tight fit between the valve disc and valve stem. The lifting and lowering of the valve disc of a globe valve is generally controlled by the valve stem. The upper part of the valve stem is a handwheel, and the middle part is a threaded and packing sealing section. The function of the packing is to prevent the internal medium of the valve body from leaking along the valve stem. The function of a shut-off valve 1、 The main f...

  The purpose of using a   check valve   is to prevent reverse flow of the medium, and a check valve is generally installed at the outlet of the pump. In addition, a check valve should also be installed at the outlet of the compressor. In short, in order to prevent reverse flow of the medium, check valves should be installed on equipment, devices, or pipelines. Generally, vertical lift check valves are used on horizontal pipelines with a nominal diameter of 50mm. The straight lift check valve can be installed on both horizontal and vertical pipelines. The bottom valve is generally only installed on the vertical pipeline at the pump inlet, and the medium flows from bottom to top. The swing check valve can be made with a high working pressure, with a PN of up to 42MPa, and a DN of up to 2000mm. According to the different materials of the shell and sealing components, it can be suitable for any working medium and any working temperature range. The medium is water, steam, gas...

  A   globe valve   is a type of valve with a simple structure, small volume, light weight, low material consumption, and multiple optional properties. ​ The reasons why it is widely accepted and applied are as follows: Function of shut-off valve 1. It is mainly used for cutting off and throttling in pipeline systems or production equipment. Due to the lower friction between the sealing surfaces of this type of valve compared to gate valves, it is suitable for pipelines or devices with large pressure fluctuations and drastic temperature and pressure changes (such as the connection of nitrogen flushing pipelines). 2. The shut-off valve belongs to the forced sealing type valve, so the handle must be forcefully pushed to the fully closed position when opening and closing. When the medium flows from bottom to top, the fluid is filtered by the through check valve and enters the inner chamber of the through stop valve When the liquid medium flows through the through check valve...

  High Performance Butterfly Valves  use a disc offset from the seat center, hence the name Double Offset. In this configuration, the disc is eccentric, or offset, from the valve seat. As the disc starts to rotate, it moves away from the seat instead of across it. This design actually uses the line pressure to help give it its seal. This feature allows the use of offset butterfly valves in high‐pressure applications such as ethanol or HVAC. It generally uses PTFE or plastic as its seat material, but metal seats are also available to meet fire‐testing specifications like API 607. Offset Disc Butterfly Valves are comprised of the following components: Body Retainer Plate Seat Disc Stem Stem Seals Standard double offset butterfly valves come with a polymer seat, usually PTFE, with a metal backup for fire safety. Metal‐to‐metal seats are also available and may provide a higher sealing quality, and allow slightly higher temperatures. FEIDA VALVE is the top ranking  China doubl...

  Butterfly valves   are a great (and less expensive) alternative to globe and other control valves in applications where 1-2% accuracy is acceptable. Process conditions will dictate whether a resilient seated or high performance butterfly valve should be selected. A resilient seated butterfly valve is the most economical choice. If pressures and temperatures are not extreme, this type of valve should work just fine. If pressure and temperature exceed the limits of a resilient seat, a high performance butterfly valve is necessary.  FEIDA Double Offset  High Performance Butterfly VALVE  would perctly solved this issue. FEIDA VALVE is the top ranking  China double offset butterfly valve manufacture . The annual output of high performance butterfly valve is more than 100,000,000 set. The  API 607 fire safe high performance butterfly valve  is also in FEIDA VALVE product range. Our fire safe butterfly valve is certificated by American Petroleum Instit...

  FEIDA VALVE is the top ranking  Chi na  double offset butt erfly valve  man ufacturer  aslo a top ranking   Stainless Steel Resilient Gate Valve manufacture r . The annual output of high performance butterfly valve and stainless steel soft seated gate valve is more than 100,000,000 set. The API 607 fire safe high performance butterfly valve is also in FEIDA VALVE product range. Our fire safe butterfly valve is certificated by American Petroleum Institute (API) according to API 607 standards. FEID AVALVE stainless steel resilient gate valves are designed with built-in safety in every detail. The wedge is fully vulcanized with FEID AVALVE’s own drinking water approved EPDM rubber compound. It features an outstanding durability due to the ability of the rubber to regain its original shape, the double bonding vulcanization process and the sturdy wedge design. The triple stem seal system, the high strength stem and the thorough corrosion protection safeguard t...

  Compare to ball valve, FEIDA  VPSA/PSA  butterfly valve  is better than ball valve for sure. Please see the listed excellent feature following: 1. Long service life, open/close 1 million times 2. Super reliable sealing performance: bi-directional sealing zero bubble 3. Patent seat design 4. Vacuum service ability 5. Available fully rated to class 2500lb 6. Anti-clout device design 7. Fire-safe design optional 8. Excellent flow and throttling characteristics covering services from cryogenic to high temperature Comparison to Ball valve 1. Double offset structure design, the disc is easy to take off from the seat during CLOSE to OPEN. 2. Lower torque than ball valve, so the cost of actuator will much more lower than the ball valve 3, Smaller size, the small size, the light mass will be a lower cost of valve with the same piping internal dimention. 4. longer life cycle 5. ON/OFF operating time is less than 1.5 second. 6. Maximum 30 operating within 1 minute. FEIDA VALV...

  Before the  resilient seated gate valve  was introduced to the market, gate valves with a metal seated wedge were widely used. The conical wedge design and angular sealing devices of a metal seated wedge require a depression in the valve bottom to ensure a tight closure. Herewith, sand and pebbles are embedded in the bore. The pipe system will never be completely free from impurities regardless of how thoroughly the pipe is flushed upon installation or repair. Thus, any metal wedge will eventually lose its ability to be drop-tight. A resilient seated gate valve has a plain valve bottom allowing free passage for sand and pebbles in the valve. If impurities pass as the valve closes, the rubber surface will close around the impurities while the valve is closed. A high-quality rubber compound absorbs the impurities as the valve closes, and the impurities will be flushed away when the valve is opened again. The rubber surface will regain its original shape securing a drop-ti...

  Difference Between Butterfly Valves and Gate Valves Gate valves As the name implies, the main function of a valve is as a gatekeeper. The gate is the main part of gate valves. A movable gate within the valve allows flow or blocks it. This movable gate is controlled by a mechanical assist such as a screw or lever, which lifts or lowers the gate within. Gate valves come in many shapes and sizes but tend to be large. Think of the valves controlling flow of water in main water supply pipes. In spite of their sometimes prodigious size, gate valves are designed to be controlled by a single individual. Butterfly valves A close cousin of the gate valve, and an ingenious variation, a butterfly valve can also come in many shapes and sizes. Such a valve also functions by using an internal gate. The difference between this and a gate valve is in the way the gate operates within the valve. Unlike the gate valve, the gate within the butterfly valve remains fixed and swivels around an internal ...

  Simultaneous construction with hydropower is more labor-saving When is the best time to install central air conditioning in the decoration site? The best is to construct central air conditioning and water and electricity at the same time. The purpose of this is to make it easier for the workers to coordinate. In addition, the power cord of the central air conditioner should be arranged by the decorating company. Generally, the opening on the beam is made by the designated personnel of the new house property. It's thankless to install the light strip Unless  floor heating  is installed in the home, it is best not to install light strips in the air outlet of the central air conditioner, because this will affect the heating effect of the central air conditioner, and the cost is high, so that the original 45° downward air outlet has to be changed to 90°. The hot air will only circulate on a parallel surface and it is difficult to blow down. Installing the top corner line ma...

  Among all types of valves, there is a particular one with the most beautiful name—the   butterfly valve . How did the name come from? In answering this question, we could use analogy. For example, the ball valve looks like a ball, so can we guess that the butterfly valve looks like a butterfly? Well, it seems a little funny, but I have to say: “Bingo, right answer!” The butterfly valve is a regulating valve with simple structure, and it can be used for switching control of a low pressure pipeline medium. The opening and closing member (valve or disc) of the butterfly valve is a disc that rotates around the valve shaft to open and close. In the cylindrical passage of the butterfly valve body, the disc rotates about the axis to achieve flow control. The valve is fully open when the disc reaches 90°, and changing the angle of the disc can adjust the flow of the medium. When the butterfly valve is fully open, it has a small flow resistance; when it is between about 15° and 70°, ...