Equalization valves

Another approach we used to balance the pressure differential of the oxygen side and the hydrogen side output of the electrolyzer was an equalization valve. 

The equalization valve is a simple device that uses opposing pressures to determine which gas is released and how much is released. 

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Check isolating valves at process impulse line see that equalizing valve is shut. 

Automatic NRVs act like check valves and cut out the boiler if its pressure falls below the main steam-header pressure. The installation of an automatic NRV may require the provision of a bypass pressure equalizing line and a pressure equalizing valve. 

Mobile phases are generally inert gases such as helium, argon, or nitrogen. The choice of carrier gas is often dependent upon the type of detector used. Gas is obtained from a tank, or sometimes from an electrolysis cell, and is passed through a series of reductors, equalizing valves, and traps to ensure constancy of pressure or flow and elimination of impurities as well. 

Theoretical gain characteristics of equal % valve Actual, inherent gain characteristics of equal % valve... 

Oxygen proceeds from the electrolyzer into an accumulator or an equalization valve to balance the pressure of the oxygen and hydrogen sides of the system. 

Another option for balancing the oxygen and hydrogen accumulation and pressure within the system is an equalization valve. The particular Stainless steel accumulator valve fabricated for this system consists of a... 

T fitting, 3/a" x 3/a" x 3/a" tube - the top of the T can be configured for use with either an accumulator, or an equalizer valve. When using the accumulator, the top outlet of the T will be plugged. The plug can be removed and tubing added to connect to the equalizer when desired. If only the accumulator will be used, then an elbow could be used instead of the T, since the extra outlet would not be needed. 

A better method is to use an equalization valve, but we wanted to explore simpler alternatives. One option is to use a differential pressure switch with solenoid valves that will open or close to balance the system. The valves are readily available, but this is actually a more expensive option because hazardous environment and chemical and material compatibility requirements must be taken into account. 

The equalization valve addresses the pressure disparity with a miniature hydraulic cylinder and a few machined parts. The miniature hydraulic cylinder is the heart of the valve. It responds to both gases to determine the amount of gas released from the oxygen side, based upon the pressure of both gases in relation to each other. The cylinder opens and closes an outlet port for the oxygen. 

Our equalization valve did not have a bellows attached, and worked extremely well during the testing period. However, a bellows should be considered a necessary addition to prevent leakage of hydrogen, and to isolate the hydrogen stream from possible contaminants that arise from the cylinder lubricant/seal used. 

A Depending on how you construct the system, either leave the system in automatic mode or physically attend to certain functions. If you are using an equalization valve, simply use the gas directly from the tank without going through the following adjustments. If you are using the accumulator the routine might be similar to this ... 

Sensor robustness quality control Corrosion can cause overt failure of a process transmitter. Sudden overpressure in differential pressure transmitter can cause zero drift. Similarly, instmmentation practice is important, for example, if technician ignores the important role of equalizing valve, then sudden pressure may come on either side of a differential pressure transmitter causing damage (when without opening equalizing valve, either side valve is closed or opened suddenly). The last issue is related to maintenance practices. To circumvent these issues, robust sensors may be deployed. 

Other features in the rod drive system are the forward - reverse valve which determines the direction of rod drive check valves which provide an hydraulic lock and prevent depressurization of the cylinder during rod immobility pressure equalizing valves to equalize pressure in both ends of the cylinder after a rod movement to permit rapid reversal of rod direction if desired. Further details on these features is supplied in the detailed analysis and description of the system. 

The retention of the reactor water level above the top of the active core during a LOCA by actuation of the equalizing valve and... 

For the main fuel drain circuit, bellows-sealed, mechanically operated, poppet alves (.see Section 15-3) will be placed in scries with the freeze valves to establish a stagnant licjuid suitable for freezing. Normally these mechanical valves will be left open. By melting the plug in the freeze line and opening gas-equalization valves, the liquid in the reactor will flow by gravity to the drain tank, and the gas in the drain tank will be transferred to the reactor system. Thus gas will not have to be added to, or vented from, the primary system. 

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