Pressurised Water System

Pressurised Water System, which is often found in large dwellings or on-board systems, and Dual Pump System, which increases efficiency and continuity of water supply.

Here are the equipment details and working principles.

1. Main equipment in the system (as pictured 1)

• Jabsco Pressure Controlled Pump: The main water pump that acts to suck water from the supply and generate pressure into the pipe line, with a built-in pressure switch to cut off operation when the pressure reaches a certain point.

• Accumulator Tank (Pressure Collector Tank): The first red tank, with the function of storing water under pressure, reduces the overly frequent "cut-off" of the water pump, stabilizes the water pressure and helps prolong the life of the motor.

• Water Storage Heater (Hot Water Boiling Tank): A large tank used to boil water. The figure shows that it can receive heat in two ways, Electric Immersion Heater (Electric Coil) and Coil Connections to Engine (Use hot water from the engine to exchange heat).

• Expansion Tank (Expansion Tank): The second red tank is mounted near the hot water tank, acting to support the expansion of the water when heated, to prevent the pressure in the system from getting too high until the pipe explodes.

• T & P Valve (Safety Valve): Pressure and Temperature Relief Valve. If the system has abnormally high heat or pressure, this valve will dump the water out for safety.

• Non-Return Valve (Check Valve): Anti-Reverse Valve, Forcing Water to flow in One Direction, Prevent Hot Water Backflow, Mixed with Cold Water

2.Pump system and installation (as pictured 2)

This image delves into the installation of a dual water pump electric motor (Duplex Pump) for durability:

• Electric Motor (Pump 1 & 2): AC motor driving water pump

• Common Discharge Manifold: A pressure integrated pipe that receives water from both pumps to supply into the main system.

• Foot Valve (Skull): Fitted at the end of the suction pipe to prevent backflow of water into the pond, eliminating the pump from decoying (Prime) water every time it starts.

• System Pressure Gauge: The pressure gauge (0-100 PSI) is used to monitor whether the pump is working normally.

3. Principles of system operation

Cold Water Side

1.The water is sucked through Strainer (filter) into the water pump.

2. The pump will compress water into the Accumulator Tank until the pressure reaches the set point (such as 40-50 PSI), so the pump will stop working.

3. When we turn on the cold faucet, the pressure from the Accumulator tank will push the water out first. The pump does not need to work immediately until the pressure falls to the specified point (Cut-in).

Hot Water Side

1. Some cold water will flow into the hot water tank through the backward valve.

2.The water in the tank is heated by electricity or heat dumped from the engine.

3. When the heat rises, it will expand. With the Expansion Tank to accept this excess pressure.

4.Hot water is supplied to Hot Taps and Shower Mixer (Mixing Valve) to adjust the temperature moderately before use.

Mixing Water (Mixing)

At a point of use, such as a Shower Mixer, water is drawn from both blue (cold) and red (hot) lines and mixed as the user wishes.

The advantages of this system

• Constant Pressure: No matter how much water is left in the storage tank, the pressure at the tap is uniform because there is a pressure collector tank.

• Energy saving: If used in combination with the engine system (in the boat), hot water can be used without power on.

• High Safety: There are both pressure relief valves and expansion tanks to support temperature changes. Bleeding is an important step in maintenance of fluid-mediated systems such as braking or cooling systems to keep the system running at full capacity because air is more flexible than liquid. If there is air, there will be pressure drop and damage.

This is a breakdown of standard procedures for air scavenging in 2 major systems.

1. Braking System

The goal is to chase the bubbles out of the brake oil line so that the brake pedal is stable, not unusually sunken or soft.

Required equipment

• Brake fluid (grade as specified in the manual, e.g., DOT 3, DOT 4)

• Ring Spanner (for tightening the repellent valve)

• Clear hose and plastic bottle

• 1 assistant (to help repeat the break)

Implementation phase

1.Fill Brake Oil: Always check and fill the brake fluid in the rest jar. Do not let dry during making.

2.Scavenging order: starting from the wheels located, farthest from the parent pump brake (mainly the rear left wheel - > rear right - > front left - > front right)

3. Generate pressure: Let the assistant repeat the brake pedal 3-5 times and hold down.

4.Unwind Valve: While the brake pedal is depressed, you unwind the Bleeder Valve, oil and air will flow out through the hose.

5.Close the valve: When the oil stops flowing or before the assistant will release the foot, hurry to close the valve immediately.

6. Repeat: Make a loop until the oil that flows out doesn't even have a few bubbles.

2. Cooling System

Air scavenging in the radiator prevents overheating from "Air Lock."

Implementation phase

1.Turn on the radiator lid: Made while the engine is completely cold. Only

2. Refill the liquid: Refill the coolant to the highest level.

3.Start the engine: Start the car with the radiator lid left open and the heater (if available) fully open to keep the water valve running and the anniversary vortex.

4. Observe the air bubbles: When the engine starts to heat, the water valve will open. You will see the air bubbles rise to the radiator neck. The water level will drop. Keep adding water gradually.

5. Wait until the fan works: When the electric fan is running and no air bubbles are coming up, close the radiator lid completely.

Maintenance precautions

• Car Color Bite Brake Oil: If the brake fluid splashes on the body, immediately wash it off with clean water.

• Do not turn on the hot pot lid: Pressure and boiling water can hit the face until severe danger.

• Other hydraulic repellent systems: such as a clutch system or a power steering system, a similar principle is to create pressure and drain at the highest point of the system. These two systems have completely different air repellent principles, as one uses fluid (oil) as the driver, the other uses state-changeable refrigerant (air fluid).

Here are the maintenance and air repellent details of both systems.

1. Industrial Hydraulics

The air in the hydraulic system causes a cavitation, a twitch vibrating device, and high heat, which can cause the pump to collapse.

How to chase air

• Self-Bleeding: Most hydraulic systems are designed to self-dismiss air by circulating oil back into the rest tank (Reservoir), air rises and self-dissociates.

• Chasing at the cylinder (Cylinder Bleeding): * Slightly loosening the hydraulic line joint at the peak of the cylinder

• Directs the cylinder to move slowly to push the air out until the oil begins to seep out evenly and then tighten.

• Bleed Valves: Some machines have a pneumatic valve installed at the top of the system, or at the pump, open this valve while gently walking (Idling).

Caution Fluid Injection: Do not touch or detect leaks while the system is pressurized. Because oil can be injected through the skin into the bloodstream, use a cardboard plate to check instead. 2. Air Conditioning System

In the air system, we do not call it "air repellent," but the "vacuum" process, because the air is humid, which clogs the valve and damages the compressor.

Vacuum Processing

1.Connect the Manifold Gauge: Connect the Gauge to the Low Side and High Side Service Valves

2. Use Vacuum Pump: Connect the middle wire of the gauge to the vacuum pump.

3.Walk the pump: Open the gauge valve and walk the vacuum pump for at least 15-30 minutes until the Low Side Gauge Needle swings down to about -30 inHg.

4.Leak test (Hold Vacuum): Close the gauge valve and close the pump. Leave for 10-15 minutes. If the needle bounce back up, the system has a leak point that needs to be fixed before filling the liquid. More tips: For the hydraulic system, if the oil in the rest tank is "white bubble," it means that there is air leaking into the suction tube (Suction Line), check the rubber seal or the joint before the pump.