There are five general body styles of ball Valves: single body, three-piece body, split body, top entry, and welded. The difference is based on how the pieces of the valve-especially the casing that contains the ball itself-are manufactured and assembled. The valve operation is the same in each case. Stainless Steel Ball Valves, Brass Ball Valves, Sanitary Ball Valves, Water Ball Valves ZHEJIANG KINGSIR VALVE CO., LTD. , https://www.cn-kingsir.com
In addition, there are different styles related to the bore of the ball mechanism itself.
Ball valves in sizes up to 2 inch generally come in single piece, two or three piece designs. One piece ball valves are almost always reduced bore, are relatively inexpensive and generally are throw-away. Two piece ball valves are generally slightly reduced (or standard) bore, they can be either throw-away or repairable. The 3 piece design allows for the center part of the valve containing the ball, stem & seats to be easily removed from the pipeline. This facilitates efficient cleaning of deposited sediments, replacement of seats and gland packings, polishing out of small scratches on the ball, all this without removing the pipes from the valve body. The design concept of a three piece valve is for it to be repairable.
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What are the characteristics of the iris attendance machine?
1. The recognition speed is generally around 0.3 seconds, and it can be passed at a glance, suitable for a wide range of people;
2. A variety of integration methods, can be connected to the mainstream access controller on the market, easy to integrate into various application systems;
3.13-475px recognition distance;
4. Advanced iris recognition algorithm;
5. Fully offline, no network required;
6. Support automatic monitoring of infrared signals and trigger the opening of the iris recognition instrument. When a person approaches the identification cabinet for iris recognition, the infrared detector automatically detects the infrared signal to open the iris recognition device;
7. You can use iris acquisition and IC card swipe function;
8. Automatic protection function, there will be an alarm when illegally removed;
What are the functions of the iris attendance machine?
Entry and modification of basic personnel information;
Collection of personnel iris characteristic value information;
Verifying the collected iris characteristic value information to ensure that the collected iris feature value information is available;
Saving the collected iris characteristic value information of the personnel to the iris attendance system feature database;
The iris image information of the iris characteristic value information of the collecting personnel is saved for future research needs;
Identify the iris information of the personnel [2];
If the identification is successful, record the personnel number and the recognition success time;