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Manifold Exchange Device
Automatic gas exchange device

Automatic gas exchange device

Description
The medical gas automatic switching device continuously supplies gas to the hospital gas piping system. When the gas at the main gas supply end is depleted, it automatically switches to the secondary supply and continues to supply gas to the gas piping system.
  The pressure gauge and light display reminds the user to replace the depleted cylinder. And the remote alarm system can be connected to the printed circuit board of the control unit.
  The gas supply that is in the supply of gas to the piping system is the "main supply end" and the spare end is the "secondary supply end". The gas is output from the cylinder, the check valve, the joint and the main switch valve enter the left and right input terminals of the control unit of the switch device, and then the main pressure regulator valve of the device is replaced. Each main regulator valve has a port mounting pressure gauge at the high pressure input to indicate the pressure value of the connector.
  Oxygen, nitrous oxide, air, and carbon dioxide are automatically switched. The pressure regulator of the main regulator is set to 100 to 110 psig; nitrogen is 210 to 220 psig. The pressure settings of the two main pressure regulators in each automatic switching device are set to the same pressure value at the factory. In addition, there are two ports on the low pressure side of the main pressure regulating valve, and a pressure gauge is also installed on one port to indicate the pressure value of the low pressure output port.
  The two inputs of the exchange valve are connected to the two main pressure regulators. The connected copper pipe and the exchange valve are connected by a one-way valve. This check valve is used to prevent gas from returning to the main regulator valve.
  All safety relief valves are used to prevent over-pressure in the event of a failure of the main regulator and prevent intermediate control of the automatic switching device. When the gas supplied from the main gas supply end to the exchange valve of the switching device is lower than the preset pressure, the exchange valve will automatically switch the gas supply from the secondary gas supply end.
  There are three pressure gauges in front of the box of the automatic gas switching device. The pressure gauge on the left indicates the pressure of the cylinder gas at the left gas supply side; the pressure gauge in the middle indicates the gas pressure output from the automatic switching device; the pressure gauge at the right indicates the pressure of the cylinder gas at the right gas supply side.
  Three status indicators are also installed in front of the cabinet. When the pressure of the gas cylinders of the main gas supply side and the sub gas supply side is sufficient, the pressure switch causes the electronic circuit to light its one side of the green light (indicating that the side is the main gas supply side). When the pressure is reduced to the preset pressure, the pressure switch extinguishes the original bright green light and the other green light; simultaneously sends an alarm signal to the remote alarm.
  When the gas at the right end of the main air supply end is depleted, the pressure provided by the right main pressure regulator of the automatic switching device also decreases. Therefore, when the gas pressure at the right gas supply side drops below 100 psig, the pressure switch will be activated to cause the red indicator light to turn on and the original bright green light will also be extinguished. When the gas cylinder of the right gas supply side is filled again, the red indicator light goes out and is in standby state, the remote alarm system returns to normal state, and the original main gas supply end (right gas source end) becomes the secondary gas supply end. The secondary gas supply (left gas source) becomes the main gas supply.
全自動氣體交換裝置(操作說明)_CHT
Features
Main gas supply to secondary gas supply:
  Up to the automatic switching device and all valves are open, the gas cylinders at the left and right ends respectively output gas to the left and right main pressure regulating valves of the automatic switching device. Each main regulator valve is connected to a pressure switch and pressure gauge. This gauge shows the gas pressure at the supply side. When the gas pressure at the supply side is less than about 90 psig (180 psig nitrogen), the pressure switch is activated. Each main regulator is manually adjusted to approximately 110 psig (220 psig nitrogen) and the output gas is delivered to the output regulator. There is a one-way valve between the main pressure regulating valve on the left and the output pressure regulating valve. In the following, the switching procedure of the main air supply end and the secondary air supply end will be described with an oxygen automatic switching device. The main regulator valve at the right gas source is set to 110 psig, and the right gas source supplies gas to the gas piping system as the main gas supply end. At this time, the left gas source is the secondary gas supply end, is in standby state and temporarily does not supply gas to the gas pipeline system.
  The   The gas at the right gas source is always supplied to the gas piping system until the gas pressure at the supply end is lower than 90 psig. This will allow the exchange valve to automatically switch the gas supply from the left gas source to the output gas. At the same time, the right green indicator light goes out and the left side green The indicator light and the red warning light are on and send an alert signal to the remote alarm system. Indicates that the switch from the right gas source to the left gas source has been completed.
  The When the cylinder of the right gas source is fully filled and the main on-off valve is opened, the pressure switch on the right gas source is closed and the relay is activated. The left green indicator light goes out and the remote alarm system returns to normal.

Main regulator and pressure gauge:
  Three pressure gauges are installed on the front end of the gas automatic switching device box, and the gas pressures of the left gas source end, the output end, and the right gas source end are indicated (left and right) respectively; the two main regulator valves in the gas automatic switching device are set The output is 110 psig (220 psig of nitrogen output).
At any time, gas will only flow from the main regulator to the gas line through the output regulator. Manually adjust the output regulator to set the output pressure to approximately 60 psig (150 psig nitrogen).

Safety Relief Valves :
Safety relief valves are designed to protect the main regulator and the downstream end of the output regulator. When the upstream pressure regulating valve fails, the safety relief valve can prevent the pressure regulating valve and the pressure gauge and prevent the gas pressure output to the gas piping system from being too high.

Air source main switch valve and output pressure regulator:
The main on-off valve controls the gas to enter the automatic switching device so that the gas at the source end can be completely turned on or off. The output pressure regulator uses a manual method to adjust the output gas pressure.

Pressure switch, status indicator, and remote alert :
The pressure switch monitors the gas pressure at the gas source and the output. When the main supply gas is exhausted and is less than 110 psig (nitrogen below 220 psig), the relay is activated, causing the exchange valve to switch the gas supply side. Also allows the electronic circuit to control the status indicator (bright or off) and the remote alarm system (alarm or not). The meaning of the status indicator display is as follows. When only one green light is on, it means that the air source end of this end is the main air supply end and the other air source end is the secondary air supply end, and the secondary air supply end is in standby. The green light does not go out until the gas supply at the main air supply end is exhausted and the gas source end switch is completed; the other green light is on; an alarm signal is transmitted to the remote alarm system. After the exhausted gas cylinders are fully refilled, the red warning light goes out.
                                                                                                                                                                             
Status Indicators Description of Meaning
Red Light Green light (left) Green light (right) left air source Right air source
OFF ON OFF Using Backup
OFF OFF ON Alternate Medium In Use
ON ON OFF Using Need to add
ON OFF ON Need to add In Use
Cylinder Replacement:
(1) Turn off the main switch valve at the air supply side.
(2) Turn off all gas cylinders at the gas source.
(3) Slowly loosen the cylinder connection tube from the gas cylinder.
(4) Connect the cylinder connection tube to the new gas cylinder.
(5) Slowly open the on-off valve on the gas cylinder.
(6) Slowly open the main valve on the air supply side.

Configuration instructions :
1. Right air source pressure gauge
2. Output Pressure Gauge
3. Left-side air source pressure gauge
4. Gas Depletion Warning Lights
5. Left gas source indicator      
6. Right gas source indicator
7. Main output
8. Right-side air source main opening and closing valve
9. The right air source connecting pipe (bus)
10. Left air source main opening and closing valve
11. Left air supply connection (bus)
  
1. Secondary regulator valve
​2. Automatic Differential Switch Valve
3.Safety Pressure Relief Valve
4. Left pressure regulator pressure gauge
5. Pressure regulator on the right side once
6. Once pressure regulator on the left
7. The first pressure regulator on the right
8. Left air source pressure gauge
9. Right air source pressure gauge
10. Left Pressure Switch
11. Right side pressure switch
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