Ductile Iron Check Valve DN200 High Quality and Reasonable Price

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Usage/Applications Of Ductile Iron Check Valve

Check valve is to rely on the flow of the media itself and automatically open, close the valve flap, used to prevent the media back valve, also known as the check valve, Dan Xiangfa, counter flow valve, and back pressure valve. Check valve is an automatic valve, its main role is to prevent the media back, to prevent the pump and drive motor reversal, as well as the release of the container medium.

Technical Date

Material Specification

Nominal Diameter


Valve Body

Cast Iron or Ductile Iron

Nominal Pressure


Valve Disc

Cast Iron or Ductile Iron or Stainless Steel

Operation Temperature


Flange Driling Standard

EN 1902-2 PN10/16

Seal Material


Suface Treatment


Valve Spring

Stainless Steel

Quick Details

Standard or Nonstandard:





Medium Pressure





Temperature of Media:

Normal Temperature



Place of Origin:

China (Mainland)

Model Number:


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Q:What's the W in the check valve H44W?
First, the meaning of "W" in check valve H44W:The H44W in the check valve W represents the seat of the check valve, and the sealing surface or lining material is the body sealTwo, check valve H44W model significanceLetter H: stands for check valveFirst number 4: the driving mode is the positive gearSecond numbers 4: the connection form is the flange
Q:Check valve does not automatically check back, how to adjust?
4 the vertical lift check valve shall be mounted on a vertical pipe.5, the lift type horizontal check valve shall be installed on the horizontal pipe.6. Do not check the weight of the valve in the line. The large check valve shall be independently supported so as not to be affected by the pressure caused by the piping system.
Q:What is the difference between the check valve and the check valve?
Check valves, Dan Xiangfa, check valves are all valves of a different name, and its role is to prevent the flow of fluid back in the pipe.
Q:If there is no check valve, there will be a reverse flow of water, what is the damage to the pump?
LZ said that the case does not matter with the check valve, in that case, in addition to affecting performance, it does not matter.
Q:What's the difference between a stop valve and a check valve? Is it a valve?
The cut-off valve has the following advantages: 1. in the process of opening and closing, the friction of the sealing surface is smaller than that of the gate valve, and it is wearable. 2. high opening height. 3. usually only a sealing surface, the manufacturing process is good, easy to repair. The valve is widely used, but because the opening and closing torque is large, the structure length is longer, usually the nominal diameter of DN are limited to the following 200mm. The flow resistance of the stop valve is greater. Thus limiting the wider use of cut-off valves.
Q:I also calculate each pump check valve and gate valve?
Should not be installed, if the installation is repeated, in fact, the original design has satisfied these functions! Gate valve is not necessarily a good thing! Nothing is better than fine! Make good use of the gate valve!
Q:Check valve in the water pump when the sound of vibration is very large, what is the matter?
Called water hammer effect, Baidu search Wikipedia detailed descriptionWater hammer blackout or shut off the valve too fast, because the pressure flow inertia, producing flow shock wave, like a hammer, which is called water hammer shock wave flow capacity pump electric pump and valve failure voltage 1s in the static state to accelerate the flow of the pipeline is zero rated speed rated flow due to fluid volume compression degree the flow changes in pipeline pressure caused by pressure or low impact and cavitation impact force and noise producing hammer like tube called water hammer effect of water hammer effect water pump inertia relationship never mind wall
Q:Check valve H41T-16. What are the numbers and letters in it?
H stands for check valve, 4 stands for flange 1, and represents form 16 for pressure. This is cast iron lift check valve
Q:Is the tank stop valve a non-return valve or a check valve?
Check valve is a one-way valve, automatically prevent reverse flow of fluid, no knob, can not be artificial blocking forward flow.
Q:Check valve h44h-25p what does that mean?
H- stainless steel4- flange connection4- rotary single structure check valveH sealing material is Cr13 stainless steel25- pressure 2.50MPAP-18-8 stainless steelH44h-25p= stainless steel flange connection, swing type single check valve pressure 2.50MPA valve body, material 18-8 stainless steel

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