DL MISSION BLAKJAK Liner Retention System

Quick Change Systems

DL MISSION BLAKJAK Liner Retention System Quick Change Systems

How it works — 60-second animation

Side view of a hydraulic liner retention system on a mud-pump fluid end.

Step 1/6 System overview

Fluid end, liner, hydraulic retainer and hand pump — four parts, one job: keep the liner seated tight under full pump load, without a sledgehammer.

Step 2/6 Insert the liner

The liner slides straight into the fluid-end bore until it lands on its seat. No wedges, no hammering — the sealing face stays clean and undamaged.

Step 3/6 Mount the retainer

The retainer nut spins on hand-tight, then the hydraulic cylinder drops over it and the hose is coupled. No tools yet — the hydraulics do the heavy work next.

Step 4/6 Pressurize with the hand pump

A few strokes drive the annular piston forward, pressing the liner onto its seat with a controlled, even preload — the same force on every degree of the sealing face.

Step 5/6 Lock mechanically, release pressure

Run the lock ring home and vent the hydraulic pressure. The preload is now held by steel, not oil — no creep, no loosening under vibration.

Step 6/6 Liner change-out in minutes

To swap a liner, reverse the steps: re-pressurize, back off the lock ring, vent, and pull the liner — typically one technician, well under 15 minutes.

Learn more: hydraulic liner retention explained →

The DL MISSION BLAKJAK liner retention system from Shijiazhuang Dongli Petroleum Machinery is a quick-change solution for Mission mud pump fluid ends. DLSY stocks four items for this system and supports buyers with fitment guidance for their pump model. Orders ship worldwide under HS code 84139100.

FAQ

What does the MISSION BLAKJAK liner retention system do?

It secures the liner in the fluid end and is designed for quick removal and replacement, shortening liner change-out time on the rig.

Which pumps is the BLAKJAK system designed for?

It is designed for Mission mud pumps. Tell us your pump model and we will confirm the matching configuration.

How many BLAKJAK items does DLSY stock?

We stock four items for this system. Contact us with your pump details for the full item list.

Do you provide installation guidance for the BLAKJAK system?

Yes. Removal and replacement guidance is available with supply, so your crew can fit the system with existing fluid-end hardware.

Can DLSY ship the BLAKJAK system internationally?

Yes. We export under HS code 84139100 to the USA, Canada and other oil and gas markets.

Related replacement parts: 4 items
HS code: 84139100

Factory ratings for this model are not published online — we verify against OEM documentation on request. Know your duty point? Cross-check rated models in the same category with the Pump Selector. Open the Pump Selector →

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