Business Information
We introduce a variety of business information, such as casting, hardware, sanitary ware, furniture, etc.
website: http://cn-metalcasting.com/
Good opportunities from the cn-metalcasting.com, so you become more wealthy boss.
Ball valve sealing the main valve seat ring material is polytetrafluoroethylene (PTFE), it is almost all chemical substances are inert, and has a coefficient of friction is small, stable performance, easy to aging, temperature for a wide range andsealing the excellent performance characteristics. The physical properties of PTFE, including the high expansion coefficient, the sensitivity of the cold and poor thermal conductivity, required seating design must focus on these characteristics. Seat sealing plastic materials including PTFE filled, nylon and many other materials. However, ...
Advantage of the ball valve (1) has the lowest flow resistance (virtually zero). (2) will not be stuck at work (in the absence of lubricant), and it could be reliably applied with the corrosive medium and low boiling point liquid. (3) in the large pressure and temperature of the range, can be completely sealed. 4 fast opening and closing, opening and closing time of some of the structure is only 0.05 ~ 0.1s, can be used to ensure that the test bed automation system. Rapid opening and closing valves, the operation no impact. 5 ball close in position on the automatic positioning. The wor...
The ball valve structure of ball valve was evolved from plug valve, the opening and closing parts of it as a sphere, the use of a sphere around the stem axis of rotation of 90 degrees to achieve the purpose of opening and closing. The ball valve of the ball valve role is mainly used for cutting off the pipeline, distribution and change the direction of media flow, designed V-shaped openings of the ball valve also has a good flow regulation. Ball valve is not only a simple structure, good sealing performance, but also in the public that pass through the smaller range of light weight, les...
Gate Valve is generally used to connect or disconnect the line of medium, its down part (disc) or down to move within the plane perpendicular to the centerline of the valve channel. The gate valve can not be used as regulating the flow of media.
Gate valve main characteristics: the fluid resistance is small; the direction of media flow unrestricted. Dimensions of gate valve and opening height, the required installation space, opening and closing a long time; in the opening and closing process, the sealing surface is easy to produce scratches, wear larger; manufac...
Gate valves incorporate a sliding gate to block fluid flow. The design of the valve operating and sealing systems typically requires that gate valves should be operated either fully open or fully closed..
A knife gate valve is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid. The distinct feature of a gate valve is the sealing surfaces between the gate and seats are planar. The gate faces can form a wedge shape or they can be parallel. Typical gate valves should never be used for regulating flow, unless they are specifically designed for ...
For example, a temperature control on a large cooker in a food plant may modulate steam in a heating jacket on the cooker. The temperature controller would modulate the steam valve to achieve the proper cooking temperature to safely prepare and maintain the food.Globe valves are available in a number of stem-opening positions to flow characteristics defined by its valve flow coefficient (Cv) or base flow characteristic, and the shape of the valve plug and seat. One option is linear, where the percentage of flow is equal to the percentage of valve stem opening. Another ...
Side Entry Ball Valve and the more cheaply made gate valves are designed to shut off the water supply to a location, such as an irrigation system, or a device, like a water heater or sink. Most in-line valves inside a home are typically gate valves, but they may rust out quicker. So, if you need to change a defective gate valve, go with the more durable ball valve. The ball valve consists of a handle on a shaft attached to a metal ball with a hole in it. When the handle is turned in the water flow direction, the hole is covered up, preventing the flow of water t...
There are several different types of check Stainless Steel Ball Valve. A ball check valve consists of a ball that sits over the valve's opening. When liquid flows past the ball, it pushes the ball away from the mouth of the valve, which gives it room to flow through the pipe. When the liquid begins to flow the other way, however, the ball fits tightly over the valve opening, essentially plugging it.
Most valves work in a similar way, although they may not contain balls. For example, swing check valves contain a swinging door on hinges that blocks backward...
By preventing the backflow of water once the pump or water supply has been shut off, a check Trunnion Mounted Ball Valve lightens the load on a water pump, prevents overspill and even guard against gray water contamination. Check valves can be one of the most important elements of a plumbing system. Because of their importance, checking and testing these valves helps ensure that the consequences of a broken check valve are never realized.
Function
A Check Valve provides a stop in the water pump system so water does not back flow from the colu...
Slab Gate Valve is a low-tech solution for controlling the flow of fluids within pipes. It has been used for more than 100 years. A gate valve works by raising and lowering a gate into a seat with a screw mechanism to control the flow. One of the weaknesses of the gate valve is that is shouldn't be left in a partially open position. If left like this, the closure element will become worn, thus losing its seating integrity. Repairing a gate valve is possible with some specialized tools.
1 Turn off the water where the water main enters the house. Open ...
Y Globe Valve are available in a number of stem opening positions to flow characteristics defined by the coefficient of variation (CV), or base flow characteristic, and shape of the valve plug and seat. One option is linear, where the percentage of flow is equal to the percentage of valve stem opening. Another is equal percentage where flow increases exponentially with valve stem travel, as the CV changes. Quick opening valves provide lots of flow increase with small increments of valve stem opening.
1 Thread the stem through the bonnet, being certain to insert...
Stainless Steel Ball Valve are commonly used in plumbing. They are installed in the hot and cold water copper lines so if you have to do a repair job like changing the faucets on a sink or taking out a sink to put a new one in, you don't have to turn off the water to the entire house. You just turn off the ball valve on the water lines leading to the work project.The handle of the valve is connected to an internal ball that has a hole running through it. When the valve is in the open position the hole in the ball is lined up with the opening in the copper pipes on...
A Dual Check Valve works the same as a normal check valve. The only difference is that there are two places where water can be stopped instead of one. A check valve is used to keep the flow of liquid moving in one direction and not to back flow up the pipe. It is used frequently in connection with city water supplies and sewer systems. The device in the check valve that keeps the water from flowing backward can be made up of a ball, disk, flap or some other obstacle that will block the flow of water.
Flap Check Valves
These check valves have a flap or di...
A Cryogenic Gate Valve controls fluid passing through a valve by raising or lowering a square or round wedge into or out of the path of a fluid. When fully closed, the surface of the wedge meets a corresponding seat in the valve body preventing fluid from passing.Gate valves excel in full open applications. You should not use them in throttling operations though as their design leads to accelerated wear.
Before Working on the Valve
First check that there is water in the pipe: If the utility or well pump is experiencing an issue or the pipe is frozen, the ga...
Slab Gate Valve operate between an open and closed position. The valve slides up and down in the pipe to open and close. These valves are most used in domestic water systems. Gate valves create a minimal pressure drop while open. Knife Gate valves are less durable, because the opening and closing easily causes wear and tear. They are often used as the first valve in a plumbing system.
Basically the valves are used to either halt or start the flow of water. It can either be used to fully open or fully close the flow of liquid or water. Partial flow of water or ...
Wafer Check Valve are used in several different devices, and they are advantageous for several reasons. For example, they stop flooding or overflowing in sump pumps and water heaters. They protect equipment in control valves, strainers and flowmeters. They also save power, because the backwards-flowing water would use up electricity even when the device was off.
Since they are used in different types of industries they are manufactured in carbon steel, alloy steel or stainless steel. Depend on size Check valves are necessary pieces in the piping. Although Chec...
Globe Valve are spherical in shape and so the name ‘Globe Valves'. However, the newer globe valves are not so much spherically shaped. Globe valves offer greater precision than other valves when it comes to regulating flow. Globe valves are used in applications where flow needs to be finely tuned. Globe valves have a plate with a hole in it, and a disk or plug completely or partially fits into the hole, slowing or stopping flow, according to Peco Valve.
1. Valves stored for future use should be examined periodically. Their machining surfaces exposed t...
A Double Check Valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. It is also a valve used in air brake systems on heavy trucks.
Usage in Water Supply: In the case of usage in water supply, it consists of two check valves assembled in series. This employs two operating principles: firstly one check valve will still act, even if the other is jammed wide open. Secondly the closure of one Angle Globe Valve reduces the pressure differential across the other, allowing a more reliable seal and...
