ZC series BT Top entry ball valves are available in size 2~24"ANSI class rating 150 to 1500 and temperature ratings of -46 to 250 . A ll meet the fire safe requirement of BS 6755 and API 6FA.
The top entry trunnion supported design and unique seat retraction technique gives the convenience of in-line repair or replace valve internal components without dismantling it from pipe line.
Because each ball seat shuts off the line fluid independently on the upstream side, so this series ball valves are suitable for double block and bleed application. Secondary sealant injection system for stem and seat is provided for emergency stop of accidental seat or stem leakage.
Anti-Static Device
Blow-out Proof Stem
Fire Safe Design
Emergency Sealant Injector
Top Entry Ball Valve is mainly applicable for pipeline and industry system such as petroleum, chemical engineering and nuclear power plants. Its body adopts an integrated design, reducing leak points. Its seat design is available for either soft or hard seal, easy for maintenance. It has a top entry and on line maintenance function. It has a lot of advantages, such as small fluid resistance, simple structure, small volume, light weight, reliable sealing, convenience for operation and maintenance, open and close quickly, as well as start and close flexibly.
It's featured by its small torque and reliable seal; and unlike common ball valve types, its seat with a spheroidal structure can adjust the seal position automatically.
Design and manufacture standard: ASME B16.34, API608, API6D and BS5351
End flange: ASME B16.5
Butt Weld: ASME B16.25
Inspection and Testing: API598
Face to face : ASME16.10 and DIN3202
Fire Safe Test : API 607/API 6FA
Top Entry Ball Valve 1.5 Inch Ball Valve, 3 Inch Brass Ball Valve, 8 Inch Ball Valve, 2 Inch Ball Valves Zhejiang Zhongcheng Valve Co.,Ltd. , http://www.apivalvestar.com
1. Concentration of mass percentage concentration solution The mass percentage concentration expressed as a percentage of the mass of the total solution is defined by the symbol %. For example, 25% glucose injection means that 25 grams of glucose is contained in 100 injections. Percent Mass Concentration (%) = Solute Mass / Solution Quality 100%
2. Volume concentration (1) The molar concentration of the solution is expressed as the molar concentration of the solute contained in 1 liter of solution, expressed in symbol mol, for example, 1 liter of concentrated sulfuric acid containing 18.4 mole of sulfuric acid. 18.4mol.
Molarity (mol) = moles of solute / volume of solution (l)
(2) Concentration of Normal Concentration (N) Solution The normal concentration expressed as the equivalent number of solute contained in 1 liter of solution is indicated by the symbol N.
For example, 1 liter of concentrated hydrochloric acid contains 12.0 gram equivalent of hydrochloric acid (HCl), and the concentration is 12.0N.
Equivalent concentration = gram equivalent of solute / volume of solution (litre)
3. Mass-Volume Concentration The concentration expressed as the mass of solute contained in a unit volume (1 cubic meter or 1 liter) solution is called a mass-volume concentration and is expressed by the symbol g/m3 or mg/L. For example, if 1 liter of chromium-containing wastewater contains 2 mg of hexavalent chromium, then the concentration of hexavalent chromium is 2 mg/L (mg/L).
Mass-volume concentration = mass of solute (grams or milligrams) / volume of solution (cubic meters or liters)
4, the conversion formula of the concentration unit:
1) normal concentration = 1000.d. mass percent concentration / E
2) mass percentage concentration = normal concentration E/1000.d
3) Molar concentration = 1000.d mass percent concentration / M
4) Mass % Concentration = Mass - Volume Concentration (mg/L) / 104.d
5) Mass-volume concentration (mg/L) = 104 mass percent concentration 5, ppm is a percentage by weight, ppm = mg/kg = mg/L ie: 1 ppm = 1 ppm = 1000 ug/L
1ppb=1ug/L=0.001mg
Where: E-solute gram equivalent;
D—the specific gravity of the solution;
M-solute molar mass;
(b) Gas Concentrations Atmospheric contaminants, the usual volumetric concentration and mass-volume concentration, are expressed in the atmosphere.
1. Volumetric concentration The volumetric concentration is expressed as the volume (cubic centimeters) or (ml/m3) of the contaminant contained in the atmosphere per cubic meter. The commonly used method is ppm, that is, 1 ppm = 1 cubic centimeter per cubic meter. 10-6. In addition to ppm, there are ppb and ppt. The relationship between them is:
1ppm=10-6=one millionth, 1ppb=10-9=one billionth,
1ppt=10-12=one trillionth, 1ppm=103ppb=106ppt
2. Mass-Volume Concentration The concentration expressed by the mass of contaminants per cubic meter of air is mass-volume concentration and the unit is mg/m3 or g/m3.
Its conversion relationship with ppm is:
X=MC/22.4
C=22.4X/M
Where: X—concentration value of the pollutant in milligrams per standard cubic meter;
C—concentration in ppm of pollutants;
M—the fractional amount of pollutants.
From the above formula can get the following relationship:
1ppm=M/22.4 (mg/m3)=1000.m/22.4ug/m3
Example 1: Find the ppm concentration of hydrogen fluoride of 30 mg/Nm3 under standard conditions.
Solution: The molecular weight of hydrogen fluoride is 20, then:
C=30.22.4/20=33.6ppm
Harbin Yuda Electronic Technology Co., Ltd. produces concentration meters, handheld concentration meters, moisture analyzers, and infrared moisture meters.
Example 2: It is known that the concentration of sulfur dioxide in the atmosphere is 5 ppm, and the concentration is expressed in mg/Nm3.
Solution: The molecular weight of sulfur dioxide is 64.
X=5.64/22.4 mg/m3=14.3 mg/m3
3, in the soil, animals and plants, solid waste ppm, ppb and mass content conversion:
1ppm=1mg/kg=1000ug/kg
1ppb=1ug/kg=10-3mg/kg
1mg/kg=1ppm=1000ug/kg
1ug/kg=1ppb=10-3ppm
Design Features
Its most difference from common Ball Valve is that its maintenance can be made on pipe line and without dismounting from the pipe line. The back space seat structure is adopted for the seat and the rear portion of seat retainer is oblique angle to prevent accumulation of impurity from affecting back space of seat.
Standard
Detailed explanation of unit conversion of concentration (I) Solution concentration Solution concentration can be divided into three categories: mass concentration (such as mass percentage concentration) and volume concentration (such as molar concentration, normal concentration) and volume concentration.