LVF阀门

When the system generates negative pressure, the pressure difference between atmospheric pressure and system pressure acts on the sealing element, pushing it to break the valve sealing element, opening the sealing surface to introduce external atmosphere into the system, and allowing the system pressure to rise to break the negative pressure until the valve sealing element falls back into place to seal, preventing external atmosphere from entering the system. When the system is under positive pressure, the working medium enters the upper part of the sealing element, pressing downwards to seal it tightly. The greater the system pressure, the tighter the seal, ensuring that the valve is watertight when under positive pressure. By now, you should understand why the valve must be installed vertically upwards. If installed horizontally, the sealing element cannot seal the sealing surface under its own weight when under positive pressure, resulting in water leakage from the suction port. If installed upside down, it would be even worse, as the sealing element would open the suction port under its own weight when under positive pressure, effectively becoming a normally open state, making it even less sealed.