Self-Regulating valve through the valve medium itself through the pressure, temperature as an energy-driven valve automatically work, no external power supply and secondary instrument. Also known as self-control valve. Self-regulating valves are the use of valve feedback signal output (pressure, pressure, temperature) through the signal pipe to the actuator drive valve to change the valve opening, to regulate the pressure, flow, temperature purposes. Self-regulating valve is a new type of control valve. Compared with the manual control valve, it has the advantage of being able to automatically adjust; compared with the electric control valve, it has the advantage of not requiring external power. Application Practice has proved that in the closed water circulation system (such as hot water heating system, air conditioning chilled water system), the correct use of this valve, you can easily achieve the system flow distribution; can achieve system dynamic balance; can greatly simplify the system Debugging work; can stabilize the working status of the pump. Self-operated control valve in the course of daily use, there will be blocking and other issues, but these problems will lead to the performance of self-regulating valve decreased, then the self-regulating valve how to prevent anti-card it? Self-regulating valve anti-plug anti-card, there are six main ways to solve and avoid: 1, Love wash method: welding slag, rust, slag and other piping in the throttle, guide parts, under the valve cover to balance the hole caused by blockage or stuck so that the valve surface, the guide surface of the resulting injury and scratches . In this case, you must uninstall the cleaning, remove the slag material, such as the sealing surface is also damaged should be ground; at the same time the bottom plug open to flush away from the balance hole into the valve cap slag material, and the pipeline Rinse. Put into operation before the valve is fully open, medium flow into the normal operation after a period of time. 2, external scouring method: For some easy to sediment, the medium containing solid particles using ordinary valve adjustment, often in the throttle, the guide block, can be flush at the bottom of the valve cover bottom flushing gas and steam. When the control valve is clogged or stuck, open the external gas or steam valve, you can complete the flushing work in the case of the valve does not move, so that the valve normal operation. 3, the installation of pipe filter method: The small-caliber control valve, especially the ultra-small flow control valve, the throttle clearance is very small, even if there is a little medium in the slag material will be blocked, it is best to install a Filter, to ensure the smooth passage of media. Control valve with locator, locator is not working properly, the air passage choke plug is the most common failure. 4, increase the throttle gap method: the medium of solid particles or pipe was washed away the welding slag and rust and other overcrowding caused by congestion, stuck and other failures can be used to throttle large gap section Flow - throttling area for the window, the opening of the spool, sleeve, because of its throttle area rather than the distribution of the circumference, the fault can be easily ruled out. If it is single, two-seater valve plunger can be changed to "V" -shaped spool, or into the sleeve valve. 5, medium scour method Use of the medium itself scouring energy, erosion and easy to take away sedimentation, easy to block things, thereby enhancing the anti-blocking valve function. Common methods are: ①closed for the flow of closed-type use; ② using streamlined body; ③ the throttle placed in the erosion of the most powerful, using this method should pay attention to improve the erosion-resistant parts of the ability to erosion. 6, straight to angular method: Straight through the inverted S flow, flow path complex, upper and lower cavity dead zone, provides a place for the precipitation of the medium. Angular connection, like 90 ° elbow flow through the medium, erosion performance, small dead zone, easy to design streamlined.
According to performance characteristics and scope of application, medical Masks can be divided into: medical protective masks, medical surgical masks, general medical masks.
Medical protective masks: Medical protective masks are suitable for the protection of airborne respiratory infectious diseases by medical personnel and related staff. Wear when in contact with airborne or droplet-borne respiratory infections. It can filter the particles in the air and block droplets, blood, body fluids, secretion droplets, etc. It is a disposable product. Medical protective masks can prevent most bacteria, viruses and other pathogens. WHO recommends that medical personnel use protective masks against particulates to prevent virus infection in the hospital air.
Kids Safety Mask,Children Face Mask,Kids Medical Mask,Kids Disposable Face Mask BIQIAO MEDICAL TECHNOLOGY(HENAN) CO.,LTD , https://www.medical-technology.net
Self-regulating valve anti-plug anti-card solution
ã€Print】 ã€Close】