Installation Instructions of Large Diameter Cast Iron Gate Valve

Large diameter cast iron gate valve used to cut off or connect the line of medium. with different materials. It applied to water, steam, oil, nitric acid, acetic acid, oxidizing medium, urea and other media with different materials. There are many applications on the oil pipeline.

Main points of installation:

1, The installation position, height, import and export direction must comply with the design requirements, the connection should be solid and close.

2, The handle of all kinds of manual valves installed on the insulated pipe shall not be downward.

3, Visual inspection must be made installation. For the cutting off cast iron gate valves in the main pipe, if working pressure greater than 1 MPa, the performance test of strength and tight should be qualified before using. The strength test. The test pressure is 1.5 times the nominal pressure, duration of not less than 5min, the valve housing, packing should be no leakage is qualified. Tightness test, the test pressure is 1.1 times the nominal pressure. The test pressure shall comply with GB 50243 Standard Test duration Quasi requirements, in order to gate sealing surface leakage is qualified.

We are Cast Iron Gate Valve Manufacturer in China, our main products catalogue are gate valve, globe valve, check valve, butterfly valve, ball valve and strainer.

Cast Steel Check Valve Installation Notes

Cast steel check valve is not very common, but the role is very large, for the steel check valve, we must know more about some of the relevant knowledge, whether it is to buy, or the operation of the way, should all aspects of consideration, so as to choose the appropriate cast steel check valve, in addition, the steel check valve in the installation should also pay attention to the method, correctly install the steel back valve.

Do not allow the check valve to withstand the weight in the pipeline. The large check valve should be supported independently, so that it is not affected by the pressure generated by the piping system. The direction of media flow should be consistent with the direction of the arrows of the valve body. Lifting vertical flap check valve should be installed on vertical pipe. The lift type flap check valve should be installed on a horizontal pipe.

How to Choose the Floating Ball Valve Correctly?

In the valve products, floating ball valve is the most widely used. It has the advantages of simple structure, convenient handling and maintenance. It can be used in high temperature, low temperature, corrosive and other different conditions just replace with different sealing materials. Compared to the price of the same size of the other balls, floating ball valve is a lot cheaper, so it is more popular among others.

In general, the temperature of the medium with no corrosion or micro corrosion is between -30 to 150 DEG C, and low differential pressure, stainless steel ball valve and PTFE valve seat can be chose. If the temperature is more than 150 DEG C , PPL is considered. 250 ~ 300 DEG C metal seal. Also, large differential pressure situations, floating ball valve is not suitable, especially the outlet vent place. Because the large differential pressure will blow the ball to be broken, result in ineffective switch, even stop working. Choose more bigger actuator to ensure the normal operation in the process. As for big calibre (DN150 or above) ball valve, it is better to choose a fixed ball valve or eccentric ball valve, V ball valve.

Installation Tips of Check Valves

Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various types of check valves used in a wide variety of applications. Check valves are often part of common household items. Although they are available in a wide range of sizes and costs, check valves generally are very small, simple, or inexpensive. Check valves work automatically and most are not controlled by a person or any external control; accordingly, most do not have any valve handle or stem. The bodies (external shells) of most check valves are made of plastic or metal.

The installation of check valves should pay attention to the following items.

1. Do not allow the check valve to bear the weight in the pipeline, and the large check valve shall be independently supported so that it is not affected by the pressure caused by the piping system.

2. The direction of the medium flow should stay the same direction with the direction of arrow on the check valve.

3. Lift vertical petal check valve shall be installed on vertical pipe.

4. Lift horizontal petal check valves shall be installed on horizontal pipes.

Announcements of Ball Valve Application

A ball valve is a form of quarter-turn valve which uses a hollow, perforated and pivoting ball to control flow through it. It is open when the ball's hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle.

Ball valves are divided into two categories, one is floating ball type and the other is fixed ball type. Ball valves are widely used in irrigation systems and are mainly used in branch pipes. The ball valve is simple in structure, small in size, and has little resistance to water flow. The disadvantage is that it can be turned on or off too fast, and it will be in the pipeline middle water hammer (the pressure will rise when the flow velocity of the pipe suddenly changes). Therefore, the ball valve should not be used in the main dry pipe, which can be used in dry, branch or the end of the pipe to flush the discharge effect.

We are a professional ball valve manufacturer in China, such asCast Iron Ball Valve, Cast Steel and Stainless Steel Ball Valve, Forged Steel Ball Valve.