Q:O ball as general regulation of opening extent

Hard seal can be adjusted, soft sealed, please be careful.The opening 0~90 curve is getting faster and faster

Q:It's the brass valve in front of the water meter. It doesn't move at all. It's broken. Found the following axis of rotation is not rust, copper plated iron, with a screwdriver to the ball screw, screw is not moving, the valve is much worse than PPR. Real junk products

What caliber, faucet is generally small caliber ball valve, can be replaced directly, if it is large, high cost words. Repair may be considered. Generally two problems: 1, stem wear or exercise, can not transfer to the ball core, you need to replace the ball valve; 2, the core of the groove long time work under the edge of wear and tear, slipping, you can replace the ball core;

Q:What does the RTFE say in the ball valve?

RTFE reinforced PTFE is more wearable than PTFETeflon PTFEThe seat of tetrafluoroethylene specified for a temperature range of ~200 DEG C -32. High temperature resistance and chemical resistance. Because of its high density and good permeability, PTFE can also prevent the corrosion of most chemical media.Conductive PTFE is an improved PTFE product that allows the current to pass through the lining and thereby cancel the insulation properties of ptfe. Because of its conductivity, conductive PTFE can not be checked by edm.+ reinforced PTFE RTFERTFE is a modification of PTFE material. Pure PTFE although very low coefficient of friction (0.02~0.04) but the wear volume is great, but also because of its easy creep, poor mechanical properties, low bearing capacity, poor dimensional stability characteristics such as friction material has great localization. Only modified by compound method to meet the special requirements of all walks of life sealing material on the wear resistance, to improve the wear resistance of PTFE, can be incorporated into some wear-resistant materials such as glass fiber, carbon fiber, graphite, molybdenum disulfide, bronze powder and some organic compounds, making them reticular junction formed in the PTFE layered structure so as to improve the the stiffness, thermal conductivity, creep resistance, and greatly improve the wear resistance.PTFE is composed of tetrafluoroethylene monomer polymerization of the polymer, the wax is similar to a PE transparent or opaque, its density is 2.2g/cm3, the water absorption rate of less than 0.01%. Its chemical structure is similar to that of PE, except that all hydrogen atoms in polyethylene are replaced by fluorine atoms. Because the C-F bond is high and stable in performance, it has excellent chemical resistance

Q:What does the sealing surface of the ball valve stand for HF?

The sealing surface HF of the ball valve represents the surface hardening treatment.Ball valve (ball valve), standard GB/T21465-2008 "valve terminology" is defined as: "open and close parts (spheres) driven by the stem, and around the axis of the ball valve for rotation of the valve.". Can also be used to regulate and control fluid, strong shear force between the metal seat seal V type ball valve V type ball core and welding hard alloy, especially suitable for containing fibers, small solid particles and other media. Switch and multi way valve in the pipeline not only can flow, and flow diversion, flexible control of the medium, but also to turn off any channel to the other two channels. This kind of valve should be installed horizontally in the pipeline. In accordance with the way to drive the ball valve is divided into: pneumatic ball valve, electric ball valve, manual ball valve.The ball (ball valve) published in 1950s, with the rapid development of science and technology, the continuous improvement of production process and product structure, in a short span of 40 years, has become one of the main valve. In western developed countries, the use of ball valves is increasing year by year.

Q:Calculation formula of ball valve flow

The sectional area of diameter of DN15, DN25 and DN50 is respectively:DN15:15*3.14/4=176.625 mm, 0.0177 square decimeter.DN25:25*3.14/4=490.625 mm, 0.0491 square decimeter.DN50:50*3.14/4=1962.5 mm, 0.1963 square decimeter.A pipe flow rate of V=4 M / s V=40 decimeter / s, and the 1 liter =1 cubic meter, the pipe flow respectively (cross-sectional area multiplied by the velocity):DN15 pipe: flow Q=0.0177*40=0.708 L / sec,It's 2.55 cubic meters per hour.DN25 pipe: flow Q=0.0491*40=1.964 L / sec,It's 7.07 cubic meters per hour.DN50 pipe: flow Q=0.1963*40=7.852 L / sec,It's 28.27 cubic meters per hour.Note: a flow rate must be given to calculate the flow rate, which is calculated in accordance with 4 meters per second.

Q:Difference between fireproof and antistatic ball valve and ordinary ball valve

Ha ha, that is, non sparking metal, alloy, copper, alloy, aluminum is all right

Q:How can a steel ball in a steel ball valve be put in?

This kind of ball valve usually has an external direction of compression, an arrow. Usually, the ball is filled from the direction of the arrow tail and inserted or tightened into the circlip.

Q:Is the stainless steel ball valve forged steel ball? Which one is suitable for the gas pipeline? (FAQ

For example, the relationship between CF8M and F316.Natural gas pipelines look at bore, pressure, temperature, and composition.Clean natural gas with ordinary carbon steel ball valve on the line.Material basically A105N, LF2 based.As for pipes, I don't need to forge steel. My suggestion is that they should be made of forged steel.

Q:What is the difference between ball valve and plug valve?

The main advantages of plug valves are as follows:Suitable for frequent operation, quick and easy opening and closing.Fluid resistance is small.The utility model has the advantages of simple structure, relatively small volume, light weight and convenient maintenance.Good sealing performanceFree from the direction of installation, the flow direction of the medium can be arbitrary.No vibration, little noise.Plug valve installation and maintenance should pay attention to the following matters:Leave the valve handle in a rotating positionCannot be used as throttling.

Q:3/4 inch ball valve specifically refers to the size of the ah? Great God pointing 5

DN20 caliber equivalent to3/4 inches