Microresistance slow lockup check valve HH44X

Short Description:

Micro-resistance slow-closing check valve is used in water supply pipeline. It is installed at the outlet of pump to prevent medium backflow and eliminate destructive water hammer. It can effectively reduce the pressure of water hammer when the valve closes and ensure the safe operation of the pipeline network. It has the characteristics of light disc, large opening, remarkable power saving effect, small fluid resistance, novel design of water hammer eliminating mechanism, stable and reliable sealing performance, wear resistance, long service life, stable operation, no vibration, no noise and so on.

Product Detail

Product Tags

Micro-resistance slow-closing check valve, also known as the check valve, its role is to prevent medium backflow in the pipeline. The opening and closing parts open or close by themselves depending on the medium flow and force to prevent the medium backflow valve is called a check valve. Check valves belong to automatic valves. They are mainly used in pipelines where media flow in one direction. Only one direction is allowed to flow in order to prevent accidents. It is suitable for cleaning medium, not for medium containing solid particles and high viscosity.



Micro-resistance slow-closing check valves are suitable for nominal pressure PN1.0 MPa~42.0 MPa, Class150-2500; nominal diameter DN15-1200mm, NPS1/2-48; working temperature-196-540 C pipelines to prevent medium backflow. By choosing different materials, it can be applied to water, steam, oil, nitric acid, acetic acid, strong oxidizing medium and urea and other media.


Main material

Carbon steel, low temperature steel, dual phase steel (F51/F53), titanium alloy, aluminium bronze, INCONEL625, SS304, SS304L, SS316, SS316L; chromium-molybdenum steel, Monel (400/500), 20 # alloy, Harrington alloy and other metal materials.


Structural characteristics

1. Structural length is short, and its structural length is only 1/4~1/8 of the traditional flange check valve.

2. Small size, light weight, its weight is only 1/4~1/20 of the traditional micro-blocking check valve.

3. The valve disc closes quickly and the water hammer pressure is low.

4. Horizontal or vertical pipes are available and easy to install.

5. Flow passage is unobstructed and fluid resistance is small.

6. Sensitive movement and good sealing performance

7. Short disc stroke and low impact of valve closure

8. Integral structure, simple and compact, beautiful appearance

9. Long service life and high reliability


Performance specification

Nominal diameter(mm) 40~800
Nominal pressure 1.0 1.6 2.5
Ps(MPa) housing 1.5 2.4 3.75
Seal up 1.1 1.76 2.75
Maximum working pressure 1.0 1.6 2.5
working temperature The temperature of <80 ~C can reach 200 ~C according to user’s requirement.
Applicable medium Water, Weak Corrosive Medium


Major Component Materials

Part name Material name
Body and bonnet Gray Iron, Cast Steel, Ductile Iron
Disc Rubber assemblies
Valve shaft Stainless steel


Design drawings



Main Dimensions Table

DN(mm) L H B
40 200 300 220
50 230 300 270
65 290 320 290
80 310 354 300
100 350 350 320
125 400 380 340
150 480 500 410
200 500 580 450
250 600 670 550
300 700 730 580
350 800 820 630
400 900 920 700
450 1000 950 800
500 1100 1100 900
600 1300 1200 990
700 1400 1550 1120
800 1500 1700 1300

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