Fluorine plastic pump valve, globe valve and gate valve what is the difference? What are the common materials used in plastic pumps?

Fluorine plastic pump valve, globe valve and gate valve what is the difference? What are the common materials used in plastic pumps?

Fluorine plastic pump USES the anti-corrosive fluorine plastic, fluorine plastic alloy steel lining fluorine plastic material such as manufacturing, users in the use of the installation process, due to the different needs, the need to install valve or gate valve, what’s the difference between these two kinds of valve performance, cut-off valve, gate valve, butterfly valve, check valve and ball valve, etc. These valves are indispensable to various kinds of piping system control unit now. Each valve is different in appearance, construction and even functional use. But the globe valve and gate valve in the shape of some similarities, at the same time have in the pipeline to do truncation with the function, so there will be a lot of valve contact not many friends will be confused between the two. In fact, if you look closely, the difference between globe valves and gate valves is quite large. This article introduces what is the difference between globe valve and gate valve.
First, the working principle of globe valve and gate valve
When the globe valve is opened and closed, it is a rising stem type, that is to say, turn the handwheel, and the handwheel will follow the stem together to do rotation and lifting movement. The gate valve is to rotate the handwheel, so that the stem do lifting movement, the handwheel itself position unchanged. Flow rates vary, and gate valves require full open or full closed, while globe valves do not. The cut-off valve has the provisions of the inlet and outlet direction; Gate valves have no inlet and outlet direction requirements. In addition, the gate valve is only fully open or fully closed two states, the trip of the gate opening and closing is very large, the opening and closing time is long. The movement stroke of the valve plate of the globe valve is much smaller, and the valve plate of the globe valve can be stopped at a certain place during the movement to do flow regulation. The gate valve can only be used to truncate, there is no other function.
Two, performance difference
Globe valve can be used for both truncation and flow regulation. The fluid resistance of the globe valve is relatively large, more laborious when opening and closing, but because the valve plate distance from the sealing surface is short, so the opening and closing stroke is short.
Because the gate valve can only be fully open and fully closed, it is completely open, the medium flow resistance in the valve body channel is almost 0, so the opening and closing of the gate valve will be very labor-saving, but the distance from the sealing surface of the gate plate is far away, the opening and closing time is long.
Third, the structure
The structure of the gate valve will be more complex than the globe valve, from the appearance of the same caliber, the gate valve is higher than the globe valve, globe valve is longer than the gate valve. In addition, the gate valve has a clear and dark rod points. The globe valve does not.
Four, seal on
Cut-off valve sealing surface of valve core is a small trapezoidal profile (specific see the shape of the valve core), falls off once the valve core, valve closing (if the pressure difference is big, closed lax, of course, but check inverse effect is good, the gate is on the side of the heart gate to seal, the sealing effect is better than cut-off valve, valve core loss is not like a globe valve valve closed.
Five, installation and flow direction
In the case of limited installation space, attention should be paid to the selection. The gate valve can rely on the medium pressure tightly closed with the sealing surface, so as to achieve the effect of no leakage. When opening and closing, the sealing surface of the valve core and the valve seat always contact and rub against each other, so the sealing surface is easy to wear. When the gate valve is close to closing, the pressure difference between the front and back of the pipeline is very large, which makes the sealing surface wear more serious.
The effect of gate valve flow in both directions is the same, the installation does not have the requirements of import and export direction, the medium can flow in both directions. Cut-off VALVE NEEDS TO BE INSTALLED IN STRICT accordance with the direction marked by the arrow of the valve body. There are clear regulations about the import and export direction of the cut-off valve.
The globe valve is low in high, from the outside there is obvious pipeline is not a phase horizontal line. The gate valve channel is on a horizontal line. The stroke of gate valves is greater than that of globe valves.
From the point of view of flow resistance in the full open gate valve flow resistance is small, load check valve flow resistance. The flow resistance coefficient of common gate valve is about 0.08~0.12, the opening and closing force is small, the medium can flow in two directions. The flow resistance of ordinary globe valve is 3-5 times that of gate valve. The valve spool of the globe valve is only contacted with the sealing surface when it is completely closed, so the wear of the sealing surface is very small. Due to the large flow force, the globe valve that needs to add the actuator should pay attention to the torque control mechanism adjustment.
There are two ways to install the globe valve, one is the medium can enter from the bottom of the spool, the advantage is that when the valve is closed, the pan root is not under pressure, can extend the service life of the pan root, and can be in the case of pressure in the pipe before the valve, the replacement of the pan root work; The disadvantage is that the driving torque of the valve is larger, which is about 1 times the flow into the upper part, and the axial force of the valve stem is large, and the valve stem is easy to bend. So this way is generally only suitable for small caliber globe valve (DN50 below), DN200 above the globe valve are selected from the medium inflow from the above way. (Electric globe valve is generally used from the medium into the way.) The disadvantage of the medium entering from the top is exactly the opposite of the lower way.
What are the common materials used in plastic pumps? Each product has a different performance, the performance of the different first depends on the selection of different materials, different materials will have different functions, Xiaobao and everyone together to learn about the production of plastic pump in Shanghai Hongdong pump manufacturing Co., LTD. For plastic pump, the most important thing is plastic, and Shanghai Hongdong plastic pump is using engineering plastic, the thermal properties and mechanical properties of the material are very good, we carry out a detailed analysis of the two. The first is thermal properties, glass transfer temperature, melting
Each product has a different performance, the performance of the different first depends on the selection of different materials, different materials will have different functions, Xiaobao and everyone together to learn about the production of plastic pump in Shanghai Hongdong pump manufacturing Co., LTD.
For plastic pump, the most important thing is plastic, and Shanghai Hongdong plastic pump is using engineering plastic, the thermal properties and mechanical properties of the material are very good, we carry out a detailed analysis of the two. The first is thermal properties, glass transfer temperature, melting point, thermal deformation temperature are very high, the use of temperature range is also large, thermal expansion coefficient is relatively small. Followed by mechanical properties, degree, high mechanical modulus, low latent degeneration, strong wear resistance and fatigue resistance. Some chemical resistance, resistance to electricity lines, but resistance, installation is convenient, and so on, these quality is depends on the performance of different selection of plastic pump, increases the inherent characteristics of the plastic pump, and its use scope has expanded effectively, and through the use of such a nature, plastic pump can be used in a variety of different industries.
It is the development of plastic pumps that creates greater benefits for the use of enterprises and gradually promotes the progress of the market. Seemingly small a plastic pump, but has brought great changes to the market, this is a good thing for the production of plastic pump enterprises, for the user is also the same, in this small series also hope that the pump industry can be better and better.