A. Such innocent questions.... Here goes.
Im going to start with the easiest question first. The horsepower available and the lowest pressure rating of any component limit the pressure setting. This means that the lowest rated component is the highest rating of the system.
The TS1011 pump is rated to 2000-psi at 4gpm but I dont know the ratings of the other components. The ability of the pump to reach the 2000-psi is controlled by the engine/motor. At full flow you need about 5.5-hp electric or 9 hp gas to get the rated pressure at the rated flow. If you can give me the following information I can tell you the potential of your system:
Gas or electric? 气体或电力？
Motor RPM? 电动机转速？
Direct Drive or belt drive? 直接传动或带传动？
Pulley sizes if applicable. 可适用的带轮尺寸
Next question... 下一个问题
There are several factors that determine which components to use on a pressure washer. In choosing an unloader you must consider the Intended purpose, operating conditions, and additional accessories. Doing so will help ensure that the unloader will last and give you the intended results. First a basic understanding of a pressure washer is necessary.
A basic pressure washer system consists of a drive, pump, regulator/unloader, hose, gun, wand, and a nozzle. The motor and pump convert horsepower to water flow to be delivered to the nozzle. Ultimately, the pressure in the system is created at the nozzle as water is forced through the orifice, which is controlled by the unloader. The unloader regulates pressure by either sending water to the nozzle or to bypass depending on the setting of the unloader. The unloader acts as a traffic cop for the system by reacting to the system pressure and directing flow either to, or away from, the nozzle. The more water through the nozzle or the smaller the orifice the more pressure you get, conversely, less water through the nozzle or larger orifice yields lower pressure. When the trigger gun is shut off the traffic cop puts up barricades and directs the flow through the detour we call bypass. Just like drivers on the road, the water circulating in bypass heats up if it is left there too long.
If the spring tension on the unloader is set low, pump pressure will be low because water is bypassing the nozzle. Increasing spring tension on the unloader will direct the flow to the nozzle and increase the operating pressure until there is no more flow to go to the nozzle. Can you guess what happens as the nozzle wears? A worn nozzle has an oversized orifice, so pressure will drop. What do you think happens if you adjust the unloader to a higher pressure setting with a worn nozzle? Remember that the unloader directs flow and that all of the flow was already going to the nozzle. In this case the operating pressure wont increase but the amount of pressure it takes for the unloader to unload (traffic cop to put up the barricade) will.
Look at it this way: At a low pressure setting everyone is wearing roller skates, which can change direction very easily. As you increase the pressure setting the vehicles change from roller skates to bicycles to compact cars to buses to semi-trucks to freight trains. Imagine how hard it would be to stop or redirect a freight train compared to a compact car. This is the concept of pressure spike.
A spike of pressure occurs when the unloader shifts modes (changes the direction of the water) from spraying to bypass. The spike pressure increases with the unloader setting until it becomes so great that damage begins to occur in the system broken hoses, blown valve caps, leaking unloaders and so on. The spike pressure increases with the size of the vehicle. The pipeline is the same and the flow is the same but the roller skates have become freight trains.
Proper unloader setting allows a small amount of continuous bypass (approximately 5% of total flow) to minimize the pressure spike and compensate for nozzle wear. As the nozzle wears the 5% bypass will be redirected from bypass to the nozzle allowing for a longer operational period before pressure begins to drop. As soon as a pressure drop is noticed the nozzle should be replaced. Once an unloader is set it should never have to be adjusted again unless there are modifications done to the system.
There are two main types of unloaders used on pressure washing equipment, pressure trapping and flow actuated. Pressure trapping unloaders react only to pressure in the system and give you instant pressure when you open the trigger gun. Flow actuated unloaders react to both flow and pressure and give you a gradual build in pressure sometimes referred to as a soft start.
Speaking in terms of intended use (application), a pressure trapping unloader is most appropriate when you are working on very durable surfaces I.E. Metal, concrete, brick, and asphalt. The sudden burst of pressure is less likely to damage these surfaces but beware if you are working on a ladder, you can lose your balance. The flow-actuated style is appropriate for more delicate surfaces such as glass, wood, limestone, asphalt, plastic and so on. Also the soft start is better for working in precarious locations. The pressure builds gradually (over about one second) so you have a better chance to maintain you balance. I have to say that following OSHA guidelines when working in elevated locations is strongly recommended.
Operating conditions affect the unloader because water quality, temperature, and time in bypass effect life and reliability. The conditions effect both types of unloaders equally inasmuch as poor water quality and extended bypass will wear them both out but one type of unloader is more expensive to repair and/or replace. On average a pressure-trapping unloader is about one quarter the cost of a flow actuated to repair or replace. Another consideration is that the pressure-trapping unloader is more forgiving as it wears out. It will usually continue to operate to some degree even as it is near complete failure. Flow actuated unloaders are slightly more finicky and may cease to function if they wear too much out of tolerance.
Finally, additional accessories such as more discharge hose, injectors, speed controllers, burners, telescoping wands and certain types of nozzles affect the unloaders differently. Pressure trapping unloaders respond to the pressure in the system. Additional accessories increase the apparent pressure and a pressure-trapping unloader will just bypass more water to regulate pressure. With a flow-actuated unloader changes to the system can effect the operation of the unloader. Any line restriction downstream of the unloader will change the Flow -actuated unloaders operating characteristics.
After reading this it may sound as if I am pro pressure-trapping unloaders and against flow-actuated. Actually my preference is flow actuated because it is easier on the system over-all. Pressure-trapping unloaders offer a little more reliability over flow actuated but once the system is setup correctly a flow actuated unloader is as reliable if not more so than a pressure trapping.
Look at the ZK7 series unloaders and the Pulsar3 unloaders both are excellent in design and operation and will provide you years of use if properly installed and maintained. .