Titan describes the DI models, the 6900 Plus DI and 12000 Plus DI, as having a submersed foot valve for very heavy materials, including drywall mud, plus an EZ swing frame that cuts spillage during paint changes and lowers the sprayer for transport. The manual adds a 10 mesh Rock Catcher inlet filter on the siphon.
Two features set the DI PowrTwins apart on Titan's product pages: a submersed foot valve and the EZ swing frame. This page reports what Titan says about each one, and then shows the parts you would touch on the site's diagrams. It does not compare the DI models with other sprayers or other brands, and it does not explain what "DI" stands for, because Titan does not say.
What Titan says the foot valve does
On the 6900 Plus DI and 12000 Plus DI pages, Titan describes a "submersed" (also called submersible) foot valve. It is designed for very heavy materials, including drywall mud, and Titan says it creates the most efficient siphon system on the market today. That is Titan's claim, not a measurement we have made, so treat it as the manufacturer's description of the design.
The foot valve sits at the bottom of the fluid section, where coating enters the pump. The manuals tie it to the pumping action directly: delivery on the upstroke only points at the lower foot valve ball not seating, from trash or wear, and an air leak on the siphon side shows up as erratic operation. Strokes should take about the same time up and down.
Inlet filtering and siphon hoses
Titan's DI owner's manual describes a 10 mesh Rock Catcher inlet filter and a 50 mesh, 18 sq in outlet filter. The inlet side is the first line of defence for the foot valve, because debris that gets past it is what stops a ball seating. The manuals have you clean the inlet filter screen at least once a day.
The same manual's accessory list names two siphon hose assemblies:
- 103-830, a 5 gal siphon hose assembly with a rock catcher, 1 in. x 4.5 ft.
- 103-808, a 55 gal siphon hose assembly, 1 in. x 6.5 ft.
The site's DI accessories pages list siphon assemblies by other numbers. The 6900 Plus DI accessories page shows 103-826 and a 55 gal siphon, 103-827, and the 12000 Plus DI accessories page lists the same two. 103-830 appears on the Plus 6900 siphon hose assembly diagram and 103-808 on older generations' accessories pages. Check which one your diagram shows, or call (713) 931-0006 with your model and serial number, before you order a hose. Titan's manuals say siphon hose threads must be taped and sealed, since air leaks cause erratic operation.
The EZ swing frame
Titan says the EZ swing frame decreases spillage during paint changes and lowers the sprayer's height and centre of gravity for transport. Titan does not publish more detail than that on its product pages, so we do not describe how the swing works or promise a specific benefit. The cart parts are on the 6900 Plus DI cart assembly and 12000 Plus DI cart assembly pages.
What stays the same as the standard Plus models
Everything else about the drive is common PowrTwin. Titan lists the hydraulic drive, the vented hydraulic fill and dipstick, the easy-remove filter that takes only three turns to remove, and the wrap-around frame for all the Plus models. The daily routine is the same on the DI models, according to the manuals:
- Check the hydraulic fluid at the Full mark on the dipstick. Titan requires Coolflo (430-361) and says not to use any other fluid.
- Fill the packing oil cup half full with Piston Lube (314-480), without overfilling.
- Clean the inlet filter screen, at least once a day.
Parts you will touch
The foot valve parts are listed on each model's fluid section diagram, and they differ:
DI foot valve parts by model
| Part | 6900 Plus DI | 12000 Plus DI |
|---|---|---|
| Foot valve housing | 451-132 | 459-019A |
| Foot valve assembly | 451-133A | 459-021A |
| Inlet screen | 451-018 | 710-046 |
| Down tube | Not on this diagram | 761-153 |
See the 6900 Plus DI fluid section and 12000 Plus DI fluid section pages for the full lists.
Both diagrams also list the foot valve cage 236-141, the foot valve ball 0509707, the inlet valve seat 0509623 and the seat O-ring 0509708. The minor service kit 144-050 is on both pages as well. The manual says that if a foot valve seat is worn on one side you can flip it to the unused side, and replace it only when both sides are worn. Read the manual's fluid section instructions before taking the foot valve apart.
Foot valve and siphon parts for the DI models:
−8%
The Short Version
Titan's DI features are a submersed foot valve, a rock catcher inlet filter and an EZ swing frame, and the rest of the sprayer follows the standard PowrTwin Plus design. If a DI pump will not prime or only pumps one way, start with the inlet screen and the foot valve ball and seat, using the diagram for your model.
Not sure which foot valve part fits your DI?
Call (713) 931-0006 with your model and serial number and our parts team will confirm the part before you order.
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