Ductile Iron Check Valve DN200 High Quality and Reasonable Price

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Technical Date	Material Specification
Nominal Diameter	DN40-DN1000	Valve Body	Cast Iron or Ductile Iron
Nominal Pressure	PN10/PN16	Valve Disc	Cast Iron or Ductile Iron or Stainless Steel
Operation Temperature	-40°C~225°C
Flange Driling Standard	EN 1902-2 PN10/16	Seal Material	EPDM OR NBR
Suface Treatment	Painting	Valve Spring	Stainless Steel

Ductile Iron Check Valve DN200 High Quality and Reasonable Price

Q: Check valve H41T-16. What are the numbers and letters in it?: H stands for check valve, 4 represents flange 1, and represents form 16 for pressure. This is cast iron lift check valve.Check valve refers to rely on the flow of the media itself and automatically open and close the valve flap, used to prevent media backflow valve, also known as check valve, one-way valve, counter flow valve, and back pressure valve. The check valve belongs to an automatic valve, whose main function is to prevent the backflow of medium, prevent the reverse of pump and drive motor, and release the container medium. Check valve (Check Valve): divided by the structure, can be divided into lift check valve, swing check valve and butterfly check valve three. Lift check valve can be divided into vertical and straight through two. Swing check valve is divided into single, double valve and multi flap type of three. Butterfly check butterfly butterfly, double butterfly, butterfly single, more than a few kinds of check valve, in connection form can be divided into thread connection, flange connection, welding and clamp type connection four kinds.

Q: My house is public flue, a total of six floor I live five floors, with the side suction hood, hood in the windy outside started as soon as the check valve pops ring from occupancy, have what way?: Please take the pipe at the hood of the range hood for 15 cm or more, and then blow the wind. Note that the installation of fixed, do not affect the valve sag.

Q: Why can't the check valve on the air pipe be used when the wind speed is less than 8 meters?: First of all, you must understand the working principle of the check valve, indeed, as you said, you can adjust the position of the hammer by adjusting the position of the drop hammer.If you are in their own design and production, consider the thickness of the blade, drop hammer size, weight, and other parameters considered.Hope to be of help to you!

Q: What is the air pipe check valve?: The air pipe check valve is installed in the ventilation or air conditioning duct. When the fan is running, the valve is opened and the air flow is passed smoothly. When the fan stops, the valve is closed to prevent the air from reversing.

Q: What's the difference between check valves and non-return valves?: Check valves are check valvesThe check valve is only a one-way start and stop valve to prevent the flow of fluid medium on all kinds of pipelines or equipment.Check valves are widely used and come in many different types,The following is a common check valve for water supply and heating:1, spring: the liquid from the bottom up, rely on the pressure spring controlled valve,After the pressure disappears, the spring force presses down the disc and seals the liquid back.Often used in the smaller diameter check valve.

Q: Detailed distinction between backflow preventer and check valve: The backflow preventer consists of two separated check valves and a drain valve. Due to the local head loss of the check valve, the pressure in the middle cavity is always lower than the pressure at the inlet. This pressure difference causes the drain valve to be closed and the pipe is in normal water supply. In abnormal pressure (i.e., the outlet pressure is higher than that of the middle cavity), even if the two check valve can not reverse sealing, safety relief valve can automatically open the reverse water emptying, and the formation of air separation, ensure the health and safety of water upstream.

Q: How can the check in the faucet prevent water from flowing backwards?: Not to prevent backflow, is able to quickly shut the water, for triple bathtub, can effectively stop the conversion between the bath and small shower water, there is a spring, when the water pressure will be water, a small amount of Water Leakage was shut up

Q: Today, I saw the name of the fire check valve on the drawing of a project. Who knows what this is? I haven't met before: When the range hood is disabled, the valve is automatically reset and closed, and the valve has high strength, easy deformation, good sealing performance, small resistance, large exhaust capacity and good performance of preventing the smoke from flowing backward. Side open fire check valve are made of metal material, after spraying and electroplating processing, beautiful appearance, spring is embedded by the mounting plate and the fastening screws do not need to install the exhaust pipe, the installation is simple and reliable, easy disassembly, easy cleaning, eliminate some problems difficult to check valves in the future maintenance of the inverse.

Q: Swing check valve can prevent any sewer defection: Sure。Swing check valve, also known as one-way valve or check valve, its role is to prevent the medium back in the pipeline.

Q: I have to use a check valve to prevent return water due to pipe installation problems due to regular water supply. But the recent discovery of a running water phenomenon, just on a full tank of water slowly from the pipeline flow away, but not all go, a flow did not flow, time is not the same, but sometimes sometimes does not flow, this is going on, ask professional personage answer: You should be horizontal check valve, with pressure difference, water pressure is not lost; or a check valve inside where the card, must be a certain pressure to baffle back.

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