Kidney failure can occur as a result of hypercalcemia and then compound the problem as a further cause of imbalance. Disturbances in nerve conductivity and cardiac muscle contractions can ultimately cause neurologic tremors or seizures, weakness, and cardiac arrhythmias. If the levels remain significantly elevated, calcium can be deposited in any soft tissue or organ system in the body. Left untreated, hypercalcemia can be fatal.
Use proportional control valves to reduce shock and give a finer degree of control to circuits that do not require extreme position accuracy, or repeatable speed and force. Proportional valves restrict flow to and from an actuator. They work best with a pressure-compensated pump in a closed-center circuit.
Brake Combination Valve. A three function combination valve contains the proportioning valve, metering valve, and a pressure differential switch in one convenient location. The combination valve is typically located on the firewall. A two function combination valve omits either the metering valve or the proportioning valve.Let's have a look at a three function combination valve. Metering Valve: The metering valve is in charge of delaying the application of the front brakes just long enough to overcome the rear brake springs.t's installed on vehicles with front disc rear drum braking systems. When the brakes are first applied, pressure quickly overcomes a spring in the valve and closes a port to the front brakes. This temporarily reduces fluid pressure. When the pressure builds to a predetermined amount (75-100 psi.).