piston pump vs diaphragm pump paint sprayer

 

Airless paint sprayers do not use compressed air. so it doesn’t need air compressor. just connect the machine to electricity power, and start your painting jobs immediately.

The basic components of the airless paint sprayers are a fluid pump, high pressure hose, airless spray gun and airless tip.
There are two pump types, piston pump and diaphragm pump. Both work very well. But the diaphragm type won’t be able to pump the Very Thick materials like a piston pump can.

Normally many people like airless paint sprayers of piston pump types. but we do recommend our diaphragm pump type also, because their quality are really very good.

 

•A piston pump has many components including a piston, V packings, and spray valves. The piston moves up creating a vacuum to suck up the paint into a chamber, the fluid section, and piston down to push the paint into a high-pressure hose.

The V- packings create a seal to prevent pressure losses during the painting operation. Professional airless paint sprayers use self-adjusting V-packings to prevent premature wear and the need for repairs.
Check valves, or ball and seat valves, direct the flow of painting material from the fluid section of the pump to the hose. This prevents the paint from being pumped back through the pick-up tube.

All piston pumps have these components in one form or another.

•A diaphragm pump also uses a piston, but in a different way. The piston moves hydraulic fluid to move the diaphragm, which in turn sucks up the paint and then pushes it through the hose and gun.
No moving parts touch the diaphragm. The movement of the piston and hydraulic fluid cause the diaphragm to move up and down very rapidly.

There are no packings with this design, but check valves are still necessary.

High-pressure hose is necessary for this application method also.

This hose is rated for the maximum output pressure of the pump; 3000 psi is the typical operating pressure.

The attached fittings are ¼ inch and will work with most units. This is very tough hose that is kink resistant and capable of withstanding very high pressure. normally its bursting pressure could be reaching 10000psi or so. it’s a nylon inner tube with 2 layers of fiber braided hose and then wraped by polyurethane.

Never attempt to repair this hose as personal injury could result. It is better to replace than repair.

Airless Spray Gun

The airless spray gun is a valve that is used to control the airless paint sprayer and hold the tip. With a handle and trigger it resembles a handgun.
When the trigger is pulled the valve is opened and paint is allowed to travel to the tip and finally to the surface being painted.

Comfort is a big factor in choosing the right spray gun.

We produce 2 and 4 finger guns like our DP6376 Which is a copy of Graco SilverPlus gun. The numbers, 2 or 4, refers to the amount of fingers needed to pull the trigger.

Some people like the 2 finger airless spray guns for their comfort and balance. Choosing a spray tip is difficult and depends on the capabilities of your pump and the material being sprayed. This choice will affect the performance and effectiveness of your airless paint sprayer.

These are the basic components of all airless paint sprayers. The type you choose to own will depend on your expectations and needs. Remember the thicker the material to be sprayed the more power you will need.

 



3 comments

  1. try this
    2016/09/01 at 08:39:41

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  2. Lyn Parrott
    2016/07/12 at 21:10:53

    I have a serious overspray problem. I’ve been trying to spray Exterior Watco Oil on wood patio ceilings using a Graco 395 and a Graco Triton 1:1. I’ve tried using tips from 311 to 535. I’ve tried full strength and thinned the oil up to 15%. I’ve tried every imaginable pressure setting. There’s a tremendous amount of overspray even when I hold the tip just 5″ from the wood. Is there a solution to this problem. I have 1500 square feet still to go and my tarps get too slick to walk on safely.

  3. Natacha
    2013/12/09 at 06:19:20

    Thanks! Nice post. But it didn’t change my mind on piston pump! I use a great one a bit like these: http://www.directindustry.com/industrial-manufacturer/piston-pump-60918.html