The difference between the clamp on check valve H71 and H76

The difference between the clamp check valve H71 and H76 is that the structure is different.

H71 model H represents check valve, 7 represents clamp connection, 1 means that the structure is a lifting straight flow channel;

In the H76 model, H represents the check valve, 7 means the clamp connection, and 6 indicates that the structure is a swing-type double-flap structure.

Therefore, H71 is a lifting type of clamping check valve, and H76 is a swing type of clamping check valve.

Additional number of check valve: HH micro resistance slow closing check valve, BH insulation check valve, HQ ball check valve;Check valve type: h stands for check valve;Check valve connection:

4 flanges, 6 welds, 7 pairs of clamps;Check valve form: 1 lifting type, 2 vertical type, 4 rotary opening type, 6 double valve type, 8 butterfly type;Check valve seals: B babbitt, F fluoroplastic, H stainless steel, M monnay.

Here are some of the well-known brands recognized in the clamp check valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Suyan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional institutions or market research data for more detailed and accurate information.

7 is the code of the valve drive form;It is followed by the code of the digital check-in valve form structure, 1 is the DC channel, and 2 is the vertical structure. From the national standard "JB T308-2004 valve model compilation method", see the figure below

1. The difference between the two:

H76H: Check valve.

7: Pair clamp. 6: Double-flap spin type.

H77H: Check valve.

7: Pair clamp. 7: Butterfly pose.

Second, a brief introduction of check valves:

Check valve refers to the valve that automatically opens and closes the valve disc by relying on the flow of the medium itself to prevent the medium from backflowing, also known as check valve, check valve, reverse flow valve, and back pressure valve. The check valve is an automatic valve, and its main function is to prevent the backflow of the medium, prevent the pump and the drive motor from reversing, and the discharge of the container medium.

H77H: Check valve.

7: Pair clamp. 7: Butterfly pose.

H76H: Check valve.

7: Pair clamp. 6: Double-flap spin type.

H77 is a butterfly check valve model, and H76 is a swing check valve model.

H76H: Check valve.

7: Pair clamp. 6: Double-flap spin type.

H77H: Check valve.

7: Pair clamp. 7: Butterfly pose.

View the standard JB T8937-2010 and JB T308-2004

H76X check valve H77X difference: H76X check valve is a clamp-type double-flap swing structure, and H77X is a clamp-type butterfly structure.

The clamp check valve is also known as a reverse flow valve, a check valve, a back pressure valve, and a check valve. This kind of valve is automatically opened and closed by the force generated by the flow of the medium itself in the pipeline, which belongs to an automatic valve.

The function of this type of valve is to allow the medium to flow in only one direction and to prevent it from flowing in the opposite direction. Usually this kind of valve works automatically, and the disc opens under the action of fluid pressure flowing in one direction; When the fluid flows in the opposite direction, the fluid pressure and the self-closing disc of the disc act on the valve seat, thus cutting off the flow.

Among them, stainless steel clamp check valve belongs to this type of valve, which includes swing check valve and lifting check valve. The swing check valve has a medium hinge mechanism and a door-like disc resting freely against the sloping seat surface. In order to ensure that the disc reaches the right position on the seat surface every time, the disc is designed with a hinge mechanism so that the disc has enough room to swing and that the disc is in true and full contact with the seat.

The disc can be made entirely of metal, or it can be inlaid with leather, rubber, or synthetic overlay, depending on the performance requirements. When fully open, the fluid pressure is virtually unhindered, so the pressure drop through the valve is relatively small. The disc seat of the lift check valve is located on the sealing surface of the valve seat on the valve body.

Except for the disc that can be raised and lowered freely, the rest of the valve is like a globe valve, the fluid pressure lifts the disc from the sealing surface of the valve seat, and the backflow of the medium causes the disc to fall back to the valve seat and cut off the flow. Depending on the conditions of use, the disc can be an all-metal construction or in the form of a rubber pad or rubber ring inlaid on the disc holder. Like globe valves, the passage of fluid through a lift check valve is narrow, so the pressure drop through a lift check valve is greater than that of a swing check valve, and the flow rate of the swing check valve is less restricted.

The difference between H76 check valve and H77 check valve:

H76H: Check valve.

7: Pair clamp. 6: Double-flap spin type.

H77H: Check valve.

7: Pair clamp. 7: Butterfly pose.

View the standard JB T8937-2010 and JB T308-2004

Check JB T308-2004 "Valve Model Preparation Method".

The first digit, 7, is a pair of clip-ons.

6 is a double-valve spiral structure.

7 is a butterfly check valve.

Let's take a look at JB T8937-2010 "Clamp Check Valve".

It's clear.

H71W clamp-on check valve is a kind of valve, due to the composition of valve body, valve disc, valve cover, etc., the valve disc is opened under the action of hydraulic pressure, and is limited to the boss of the valve cover, the fluid passes through the outside of the valve disc, when the outlet pressure is greater than the inlet pressure, the valve disc is closed under the action of hydraulic pressure and spring force to stop the reflux of fluid.