# High-Dosage Hair & Body Pumps (4.0 ml): Wide Dip Tube Internal Diameter, Ball Cage Fluid Flow, and Priming Strokes
TL;DR — Hair and body formats are dose formats: the user wants a full amount in one or two strokes, which is exactly what the high-dosage tier of the pump catalog is for. The catalog records 62 models across lotion and foam variants, with per-stroke outputs of 0.13 ml, 0.40 ml, 0.75 ml, 1.50 ml, 2.20 ml, 2.40 ml and 4.00 ml — 4.00 ml at the top — and neck finishes from 18/410 to 28/410. Feeding that volume between strokes is the mechanism's work: dip tube bore, ball cage flow, refill pacing, all project-set. The record stops where numbers would be guessed: priming behavior at 4.0 ml is a project calibration, not a catalog field.
<pre class="language-mermaid"><code>flowchart LR
A["Pump catalog<br/>62 models – lotion and foam"] –> B["Per-stroke output 4.00 ml<br/>high-dosage record"]
B –> C["Recorded components<br/>ball and dip tube"]
C –> D["Priming at 4.0 ml<br/>project calibration, not catalog"]
B –> E["Testing hooks<br/>dosage/output – pump life-cycle"]
D –> E
</code></pre>
Why: The Dose Format Wants Fewer Strokes, Bigger Shots
Nobody counts drops in the shower. Shower gel, body lotion, conditioner, after-sun — applied over large areas, quickly, one-handed, often under running water — carry a promise that one actuation delivers coverage, a promise that lives in the per-stroke output, with 4.00 ml per stroke the recorded top of the ladder.
A large per-stroke dose is also a plumbing problem. Every stroke empties the pump chamber, and the next only delivers if the chamber refilled in between — through a dip tube, past a ball check valve, against a product head that grows as the bottle empties.
The record anchors the context. Pumps covers the 62 recorded models — lotion and foam variants — with per-stroke outputs from 0.13 ml to 4.00 ml, and dispensers holds the broader function family. What the catalog does not hold is behavior: priming at 4.0 ml is project calibration, everything below that line is mechanism guidance.
How: Feeding a Large Dose, Stroke After Stroke
1. The output ladder and where 4.00 ml sits
The catalog records per-stroke outputs of 0.13 ml, 0.40 ml, 0.75 ml, 1.50 ml, 2.20 ml, 2.40 ml and 4.00 ml — each a model-level record of what a specific pump is built to deliver, with 4.00 ml at the top as the high-dosage record. The same family records neck finishes from 18/410 to 28/410, which describe where the pump attaches, not how it behaves. A project picks one of these recorded outputs first; feeding behavior for that output is then confirmed on the project plan.
2. Wide dip tube internal diameter
The dip tube is the feed path from bottle to pump inlet, and its bore — the Ø of the internal diameter — sets the cross-sectional area available for flow. Two mechanisms matter at the high-dosage end. Flow resistance: a wider bore lowers the effort needed to pull product up the tube during the draw, essential when the pump must refill a large chamber quickly. Refill volume: the tube holds product between strokes, so its volume and length set whether the chamber is ready for the next actuation. No bore size is published: dip tube internal diameter is not published by the program; configured and confirmed per project.
3. Ball cage fluid flow
At the pump inlet, the ball and its cage form the check valve separating bottle from chamber: on the draw the ball lifts and product flows through the open area between ball and cage walls; on the stroke the ball seats and the dose is forced out. The flow story is the cage's — open area, guidance so the ball seats consistently — and the larger the dose class, the more volume passes through that inlet every refill. Assembly quality shows up in the same place. For viscosity-dominated products, the high-viscosity flapper and ball-check insight covers the adjacent check designs. No cage dimensions are published; ball cage fluid flow is not published by the program; configured and confirmed per project.
4. Priming strokes
Priming is the pump's self-start: the first actuations move air out and product in until every stroke delivers the full dose. The stroke count to prime depends on air volume in the system, refill-path resistance, formula viscosity, tube length, and storage between uses. It is also the first quality signal a consumer meets — many strokes before any product reads as broken — so projects set a priming target early. The record's position is explicit: priming behavior at 4.0 ml is a project calibration, not a catalog field. The mechanics of a struggle to prime are covered in liquid foundation priming failure, and stroke-side physics in actuation velocity and stroke cavitation.
5. Pressure drop and recovery time
Two pacing parameters decide whether consecutive strokes match. Pressure drop is the resistance the fluid meets along the feed path — bore, tube length, shoulder bends, cage restriction — during the draw. Recovery time is how long the chamber needs to refill before the next actuation delivers fully. At the high-dosage tier the chamber is large, so refill is a meaningful fraction of the use cycle: recovery that lags the user's rhythm delivers a weak second stroke exactly where the dose contract lives. Viscosity is the cross-cutting variable — formulations in the cPs range change flow along the whole path — which is why the High Viscosity feature set is recorded on specific model designations rather than family-wide. Pressure drop and recovery time are not published by the program; configured and confirmed per project.
6. Verification wiring: dosage and life-cycle testing
Two recorded testing capabilities sit on this family. The dosage/output test measures delivered output against the project's target — the full curve from the first stroke, through priming, to steady state. The pump life-cycle test runs the mechanism across repeated actuations to expose feed-path degradation: sealing wear, dip tube behavior, seal fatigue. Both are capability-level; targets and pass criteria are per-project. The failure modes these tests usually surface are collected in the twelve-test lab matrix and on quality & testing.
What: Recorded Program Data and the Verification Hooks
- Pump catalog: 62 recorded models covering lotion and foam variants;
- Per-stroke output records: 0.13 ml, 0.40 ml, 0.75 ml, 1.50 ml, 2.20 ml, 2.40 ml and 4.00 ml, with 4.00 ml the recorded high-dosage record;
- Neck finishes: recorded span from 18/410 to 28/410;
- High Viscosity feature set: recorded on four model designations — one base model plus an A/B/C line;
- Component record: ball and dip tube are recorded components;
- Testing capabilities: dosage/output test and pump life-cycle test are recorded;
- Boundary: priming behavior at 4.0 ml is a project calibration, not a catalog field;
- Project layer: dip tube internal diameter, ball cage fluid flow, priming stroke counts, pressure drop, and recovery time are not published by the program; configured and confirmed per project.
Gotchas
- Priming is not a catalog number. It is a project calibration; any stroke count quoted as program data would be invented.
- 62 models do not mean uniform features. The High Viscosity feature set is recorded on four designations; family-wide quoting overstates the record.
- The finish span is a range, not a per-model fact. Neck finishes 18/410 to 28/410 are the recorded span; each model's coverage is confirmed per project.
- The output ladder is distinct records. 0.13 ml through 4.00 ml are separate per-stroke output records; a project confirms which output and model pairing applies.
- Feeding parameters carry no published values. Dip tube internal diameter, ball cage flow, priming stroke counts, pressure drop, and recovery time are not published by the program; configured and confirmed per project.
- Capability-level tests, per-project verdicts. Dosage/output and pump life-cycle testing are recorded capabilities; rates, loads, and pass criteria are per-project.
Related Resources
- Categories: Pumps · Dispensers
- Related insights: High-Viscosity Lotion Flapper & Ball Check · Liquid Foundation Priming Failure · Pump Actuation Velocity & Stroke Cavitation · Foundation Pump Clogging & Duckbill Valves · Cream Pump Flapper Fatigue in Polyolefins · The Twelve-Test Lab Matrix
- Quality & Testing Capabilities — dosage/output and pump life-cycle testing