Membrane valve, trunk outlets

8 variants

The same round chamber and flexible sheet as the branching valve, with one outlet channel. In two of the eight variants that channel runs to a straight manifold, the trunk, along one side of the cell, which carries all the outlet pins; the other six have a single outlet and no trunk.

What it is for. The same job as the branching valve — opening or closing a liquid path — where the layout suits the outlets in a row along one side.

Variants

Sizes below are given in px: units of the design grid these parts were drawn on, where one unit is 0.0076 mm. That is not the printer's pixel. The printer has its own, different pixel size, and nothing on this page is expressed in it — see Hardware and process.

`valve_100px_3out_0`

H.R.3.3 design

Credit. Gale Lab, University of Utah. The lab's own design, made with the lab's generator scripts; not in the public design kit (utah-MFDA/h.r.3.3_pdk). Licence: MIT (Copyright (c) 2026 Gale Lab, University of Utah).

valve_100px_3out_0. A computer render of the cell's channels, in orange, inside its footprint of 1.37 mm × 1.37 mm (from its LEF), drawn see-through; not a photograph. Beside it, its cross-section through the middle.

Parameters for valve_100px_3out_0
Valve diameter	100 px
Where liquid enters the chamber	Edge
Number of outlets	3
Membrane thickness	1 layer
Fluid chamber height	3 layers
Air chamber height	6 layers
Channel cross-section	8 px × 6 layers
Footprint	180 × 180 px
Ports	1 fluid in, 3 fluid out, 1 air in, 1 air out
Layout grid	0.0076 mm per px

Files for this variant

LEFvalve_100px_3out_0.lef1.2 KBDownload
SCADvalve_100px_3out_0.scad46.9 KBDownload

`valve_150px_1out_0`

H.R.3.3 design

Parameters for valve_150px_1out_0
Valve diameter	150 px
Where liquid enters the chamber	Edge
Number of outlets	1
Membrane thickness	1 layer
Fluid chamber height	3 layers
Air chamber height	6 layers
Channel cross-section	8 px × 6 layers
Footprint	210 × 210 px
Ports	1 fluid in, 1 fluid out, 1 air in, 1 air out
Layout grid	0.0076 mm per px

Files for this variant

LEFvalve_150px_1out_0.lef0.9 KBDownload
SCADvalve_150px_1out_0.scad45.6 KBDownload
STLvalve_150px_1out_0.stl84.9 KBDownload

`valve_190px_1out_0`

H.R.3.3 design

Parameters for valve_190px_1out_0
Valve diameter	190 px
Where liquid enters the chamber	Edge
Number of outlets	1
Membrane thickness	1 layer
Fluid chamber height	3 layers
Air chamber height	6 layers
Channel cross-section	8 px × 6 layers
Footprint	240 × 270 px
Ports	1 fluid in, 1 fluid out, 1 air in, 1 air out
Layout grid	0.0076 mm per px

Files for this variant

LEFvalve_190px_1out_0.lef0.9 KBDownload
SCADvalve_190px_1out_0.scad45.6 KBDownload

`valve_20px_1out_0`

H.R.3.3 design

Parameters for valve_20px_1out_0
Valve diameter	20 px
Where liquid enters the chamber	Centre
Number of outlets	1
Membrane thickness	1 layer
Fluid chamber height	3 layers
Air chamber height	6 layers
Channel cross-section	8 px × 6 layers
Footprint	180 × 180 px
Ports	1 fluid in, 1 fluid out, 1 air in, 1 air out
Layout grid	0.0076 mm per px

Files for this variant

LEFvalve_20px_1out_0.lef0.9 KBDownload
SCADvalve_20px_1out_0.scad45.7 KBDownload
STLvalve_20px_1out_0.stl56.8 KBDownload

`valve_40px_1out_0`

H.R.3.3 design

Parameters for valve_40px_1out_0
Valve diameter	40 px
Where liquid enters the chamber	Edge
Number of outlets	1
Membrane thickness	1 layer
Fluid chamber height	3 layers
Air chamber height	6 layers
Channel cross-section	8 px × 6 layers
Footprint	180 × 180 px
Ports	1 fluid in, 1 fluid out, 1 air in, 1 air out
Layout grid	0.0076 mm per px

Files for this variant

LEFvalve_40px_1out_0.lef0.9 KBDownload
SCADvalve_40px_1out_0.scad45.6 KBDownload

`valve_40px_8out_0`

H.R.3.3 design

Parameters for valve_40px_8out_0
Valve diameter	40 px
Where liquid enters the chamber	Edge
Number of outlets	8
Membrane thickness	1 layer
Fluid chamber height	3 layers
Air chamber height	6 layers
Channel cross-section	8 px × 6 layers
Footprint	180 × 270 px
Ports	1 fluid in, 8 fluid out, 1 air in, 1 air out
Layout grid	0.0076 mm per px

Files for this variant

LEFvalve_40px_8out_0.lef1.9 KBDownload
SCADvalve_40px_8out_0.scad47.4 KBDownload

`valve_80px_1`

H.R.3.3 design

Credit. Gale Lab, University of Utah. The lab's own changes to the public design kit's cell of this name; the public kit (utah-MFDA/h.r.3.3_pdk) has a different design under the same name. Licence: MIT (Copyright (c) 2026 Gale Lab, University of Utah; Copyright (c) 2021 utah-MFDA).

valve_80px_1. A computer render of the cell's channels, in orange, inside its footprint of 1.37 mm × 1.37 mm (from its LEF), drawn see-through; not a photograph. Beside it, its cross-section through the middle.

Parameters for valve_80px_1
Valve diameter	80 px
Where liquid enters the chamber	Centre
Membrane thickness	1 layer
Fluid chamber height	3 layers
Air chamber height	6 layers
Channel cross-section	14 px × 10 layers
Footprint	180 × 180 px
Ports	1 fluid in, 1 fluid out, 1 air in, 1 air out
Layout grid	0.0076 mm per px

Files for this variant

LEFvalve_80px_1.lef0.9 KBDownload
SCADvalve_80px_1.scad45.6 KBDownload

`valve_80px_1out_0`

H.R.3.3 design

Parameters for valve_80px_1out_0
Valve diameter	80 px
Where liquid enters the chamber	Centre
Number of outlets	1
Membrane thickness	1 layer
Fluid chamber height	3 layers
Air chamber height	6 layers
Channel cross-section	8 px × 6 layers
Footprint	210 × 210 px
Ports	1 fluid in, 1 fluid out, 1 air in, 1 air out
Layout grid	0.0076 mm per px

Files for this variant

LEFvalve_80px_1out_0.lef0.9 KBDownload
SCADvalve_80px_1out_0.scad45.7 KBDownload
STLvalve_80px_1out_0.stl56.9 KBDownload

Credit. Gale Lab, University of Utah. The lab's own designs, made with the lab's generator scripts, and its own changes to kit cells of the same names; not in the public design kit (utah-MFDA/h.r.3.3_pdk). Each variant says which. Licence: MIT (varies by variant: each variant gives its own).

What changes between variants: Chamber diameter, Number of outlets.

Technical details — where these descriptions come from

Two cells, valve_40px_8out_0 and valve_100px_3out_0, call extra_outs(), documented in the source as the “extra fluid outlet manifold (vertical trunk at out_fluid)”. “Vertical” is the layout's Y axis: nothing rises. The trunk is a channel at the level of the outlet channel, beyond the chamber, which it does not touch, so every outlet on it is fed through the one opening in the chamber. The branching family calls extra_pins() instead: an opening and a channel for each outlet.

Every number on this page is read out of the variant's own .scad source at build time, not copied from the old catalogue text. Sizes are given in the layout grid the cells are drawn on — px here is that grid, whose default is stated per variant below. It is not the printer's pixel pitch, which is a different number; see Hardware and process.

What the status words mean

Each variant's status names the printer it is drawn for: the H.R.3.3, the printer the README of the lab's process design kit names.

Tested in the lab with real chemistry	Measured against known chemistry in physical experiments.
Printed and measured on the bench	Printed, and its behaviour measured on the bench matches the design.
A test print	A physical article exists.
Checked in CAD	Modelled and geometry-checked in CAD.
Made by the design software	Ran end-to-end through the pipeline.
An idea	A design on paper or in a wizard spec.
A design for its printer	Drawn on its design kit's grid for the printer the kit is made for, which its status names.

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