Hydra bleed valves come in more than one design. The Hydra X valve and the Hydra M 1/2 in. NPT valve share the 945-906 tungsten seat, 138-226 carbide ball and two PTFE O-rings. The 1/8 in. NPT valve (944-620), also listed for the Pro IV, uses a 944-904 seat and a 761-715 ball instead. Pick the diagram page for your model and thread size first.
What the bleed valve does
A Hydra holds fluid at spray pressure in the pump, hose and gun. The bleed valve is how that pressure leaves the system safely. Titan's manuals have you open it as part of the pressure relief procedure, with the gun's trigger lock, the pressure setting and the grounded metal waste container steps that your model's manual spells out. On the Hydra X, the relief valve also changes the pump's job: turn it left for circulation and right for spray.
You open it at every shutdown and every flush. Titan's manual also names it in the troubleshooting table: slow pump movement with the gun off can be a loose connection, an open bleed valve or worn packing. Check that the valve is fully closed first, since that costs nothing.
Hydra X bleed valve diagram
The Hydra X 4540 and 7230 share one page: Hydra X (4540,7230) Bleed Valve Assembly. It lists nine parts, numbered by callout.
Hydra X bleed valve parts, by callout
The seat, ball and two O-rings are the sealing parts. Everything else in the list is hardware that holds them together or lets you turn the valve. The complete valve is also sold as 945-600A Bleed Valve, which the site lists on the Main Assembly II page at callout 11, so you can order the whole valve when a single part is not the issue.
Hydra M 1/2 in. NPT bleed valve
The Hydra M2000 and M4000 each have a bleed valve page titled 1/2 in. NPT: Hydra M2000 Bleed Valve Assembly, 1/2 in. NPT and Hydra M4000 Bleed Valve Assembly, 1/2 in. NPT. They carry the same sealing parts as the Hydra X valve: 945-906 seat, 138-226 ball, and 891-073 and 891-183 O-rings. The site's fitment note on the seat lists Hydra M and Hydra Pro Super as well as Hydra X 4540 and 7230.
Hydra X valve against the Hydra M 1/2 in. NPT valve
| Part | Hydra X page | Hydra M 1/2 in. NPT page |
|---|---|---|
| Seat, ball and O-rings | 945-906, 138-226, 891-073, 891-183 | 945-906, 138-226, 891-073, 891-183 |
| Valve stem stop | 945-026 | 944-026 |
| Valve stem | 945-023 | Not listed |
| Housing, knob, locknut | 945-022, 945-005, 970-011 | 945-022, 945-005, 970-011 |
The M4000 page has nine lines because it also shows a second knob number, 944-024, at callout 3 beside 945-005 at callout 1. If you are unsure which knob you have, call before ordering.
The stem stop is the one number that differs between the two pages, 945-026 on the Hydra X and 944-026 on the Hydra M. The Hydra M page does not list a valve stem at all. Order the stem stop from your own model's page.
1/8 in. NPT bleed valve and the Pro IV
The second design is the 944-620 valve, titled 1/8 in. NPT on the Hydra M2000 and Hydra M4000 pages. Its parts differ from the 1/2 in. valve, and so do most of the numbers:
- 944-904 Tungsten Valve Seat (callout 7)
- 761-715 1/4 Tungsten Ball (callout 5)
- 944-004 O-ring PTFE (callout 3), and 945-003 Copper Gasket (callout 6)
- 944-020 Valve Housing, 944-024 Knob and 944-026 Valve Stem Stop
The Hydra Pro IV Bleed Valve Assembly page lists the same seven part numbers as the 944-620 pages. Its title does not state a thread size, so use the numbers and the callouts, and confirm by phone if your valve looks different from the diagram. The 944-904 and 945-906 seats are listed on different valve pages, so do not substitute one for the other.
Complete valves, bleed lines and the service kit
Three other numbers come up when people look for a Hydra bleed valve:
- 945-600A Bleed Valve, the complete valve. It is listed on the Hydra X Main Assembly II page and on the Hydra M2000 and M4000 outlet assembly pages (M2000).
- 944-028A Bleed Valve Assembly, listed on the Bleed Line Assembly With Valve pages for the M2000, M4000 and Pro IV, with the 103-101A bleed line and 538-030 fluid hose assembly.
- 944-050 Bleed Valve Service Kit, listed on the Hydra M accessories pages. Its contents and which valve it suits are not stated here, so confirm with the parts team before you buy.
Signs it needs attention
We have no service interval from Titan for the bleed valve, so decide by symptoms. The ones that point at it are a pump that keeps moving with the gun off, and pressure that will not hold. The manual's list for the first symptom is a loose connection, an open bleed valve or worn packing, and the seat, ball and O-rings are what make the valve seal, so they are the parts to suspect when the valve is closed and the symptom is still there.
- Confirm the valve is turned fully closed for spraying (on the Hydra X, right for spray).
- Check hose and fitting connections for a loose one.
- Replace the seat, ball and O-rings if the valve is closed and the symptom remains, using the part numbers for your valve.
- If the symptom is still there, move on to the packings, using your manual's troubleshooting table.
We do not describe the rebuild itself. The disassembly and reassembly belong in Titan's manual for your model, which you can find on our manuals page.
Ordering the right parts
Identify your sprayer
Hydra X 4540 or 7230, Hydra M2000, M4000 or Pro IV. The model decides which diagram page applies.
Match the valve design
A 1/2 in. NPT valve (Hydra X and Hydra M) and a 1/8 in. NPT valve (Hydra M and the Pro IV page) have different seats and balls. Open the page for your model and compare the valve to the diagram.
Read the callout numbers
Add the numbered parts that match what you are replacing. For the sealing set, that is the seat, ball and O-rings for your valve.
Call if the diagram is not clear
Phone (713) 931-0006 with the sprayer model and serial number. This matters most for the M4000's two knob numbers and for the service kit.
Hydra bleed valve parts, with current prices:
The Short Version
Find your sprayer's bleed valve page first. The Hydra X and Hydra M 1/2 in. NPT valves share the 945-906 seat, 138-226 ball and two PTFE O-rings. The 1/8 in. NPT valve uses 944-904 and 761-715. Close the valve fully before you suspect it, and order the stem stop from your own model's page.
Unsure which bleed valve you have?
Call (713) 931-0006 with your sprayer model and serial number and our parts team will confirm the valve and its parts before you order.
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