A "relief valve" can only be accessed when the pool is empty, and no swimming pool should ever be left empty. The only exception is when absolutely necessary due to repair or resurfacing, and that should be completed within the shortest possible time.
Any pool that is empty, and that has a relief valve, should have the valve removed for the entire time, regardless of the weather forecast.
A "hydrostatic" relief valve opens and closes when needed as it attempts to equalize the pool water pressure with the ground water pressure. Human intervention is not involved because the pool is still filled. Hydrostatic valves are great in theory, but seldom work after a few years.
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Mitral Valve
Mitral valve or biscupid valve
The bicuspid valve is also known as the mitral valve or the left atrioventricular valve.
I believe you are referring to the "mitral" valve. It is also known as the bicuspid valve. It is the valve between the left atrium and left ventricle.
The left atrioventricular valve is also known as the mitral valve.
The valve present between the left auricle and the left ventricle is the mitral valve, also known as the bicuspid valve. It consists of two flaps that open and close to regulate blood flow from the left atrium to the left ventricle and prevent backflow of blood.
The bicuspid or mitral valve and the aortic valve are on the left side of the heart. The mitral valve separates the left atrium and left ventricle, and the aortic valve is between the left atrium and the aorta.
right atrium - right ventricle = TRICUSPID VALVE; right ventricle - lungs = PULMONARY SEMILUNAR VALVE; lungs - left atrium = not really a valve, more a perforation in the left pericardium; left atrium - left ventricle = MITRAL VALVE; left ventricle - aorta = AORTIC SEMILUNAR VALVE.
The PCV valve on a 2004 Ford Taurus should be on the left side of the engine. It plugs into the valve cover at the rear of the cover.
Mitral Valve
This valve has different names. It is the LAV valve or Mitral Valve or Bicuspid valve.