https://www.radicalscientific.com/laminar-air-flow.html

Mag auf den ersten Blick Denglish klingen, ist im Englischen aber üblich.

Sitz (Masch) / seat n, seating n / ... / kugeliger ~ (Masch) / sperical seat ...
Sitzfläche (Masch) / face n (of a valve) / (Masch) / seat n, seat face
Sitzring (bei Absperrarmaturen, Masch) /seat ring
Ventilsitz (zur Auflage des Ventiltellers, V-Mot) / valve seat |~sitzbläche (am Ventil) / valve face
(Kucera, Dictionary of Exact Seience and Technology)

mechanical engineering [INDUSTRY]
de Ventilsitz
en valve seat
https://iate.europa.eu/search/result/1669199981051/1
(5 x an erster Stelle von 10 Treffern, 2 x 'valve seating')

valve seat [ING.] der Ventilsitz Pl.: die Ventilsitze
valve seating [TECH.] der Ventilsitz Pl.: die Ventilsitze
valve body seat [TECH.] der Ventilsitz Pl.: die Ventilsitze
valve face [TECH.] der Ventilsitz Pl.: die Ventilsitze
valve lip [TECH.] der Ventilsitz Pl.: die Ventilsitze
https://dict.leo.org/englisch-deutsch/Ventilsitz

Ventilsitz Substantiv, maskulin (Technik) valve seat n
https://www.linguee.de/deutsch-englisch/search?query=Ventils...

Ventilsitz aus Edelstahl. glasfaserverstärkte Kunststoffteile.
Valve seat made of stainless steel. glass fiber reinforced plastic parts.
:
Ausgestattet mit Kugelhahn Zylinder und Ventilsitz CD Stil.
Equipped with ball valve cylinders and CD style valve seat.
https://context.reverso.net/übersetzung/deutsch-englisch/Ven...

Dazu eignen sich kleine Bürsten in verschiedenen Stärken, um den Farbkanal und Filtersitz von Farbresten zu befreien.
For this purpose, small brushes in different strengths are suitable to free the paint channel and filter seat of paint residues.

Filtervorrichtung nach einem der Ansprüche 14-18, dadurch gekennzeichnet, daß mindestens eine Hälfte (24) des Filtergehäusemoduls einen Filtersitz zur Aufnahme eines Filters (26) umfaßt.
Filtering device according to any of the claims 14-18, characterised in that at least one half (24) of the filter housing module includes a filter seat for reception of a filter (26).
https://context.reverso.net/übersetzung/deutsch-englisch/Fil...

last but not least:

"filter seat" Ungefähr 130.000 Ergebnisse (0,31 Sekunden)
"filter seating" Ungefähr 85.500 Ergebnisse (0,40 Sekunden)

An open end of the piston is provided for sealing the piston against the central seating surface of the valve seat, …
https://www.freepatentsonline.com/5509407.html

The method describes placing a conventional filter in the filter frame and adjusting its length to accommodate the selected filter, the filter can then be placed within the air handling system in a usual seat without fear of dislodgement due to flexing or bending of the air filter when it becomes loaded with dust and debris.
:
Thereafter the filter and frame combination can be placed in an air duct filter seat of a heating or air conditioning system. The frame will stabilize the filter and prevent it from dislodging from its seated position.
https://patents.google.com/patent/US6790261
(Please note, that the filter frame is an outer casing for the filter)

Removal of the filter element:
1. Loosen gland and remove with the filter seat.
2. Pull old filter element from the filter seat
3. Insert a clean filter element and knock lightly into filter seat with a plastic hammer.
4. Re-insert the filter seat and screw-in the gland. [200 Nm at 9/16“ 1550 and 4500 bar; 150 Nm at 1/4“ and 3/8“ 4500 bar ; 100 Nm at 1/4“ and 3/8“ 1550 bar]
Figure 14: Structure of a cup/type filter
http://www.maximator.de/assets/mime/46748de41dd73ed0db524789...
(Note: sectional view)

To check the tight seat of a HEPA filter element, a leak test device can be connected to the filter seat test groove from outside the filter housing.
https://www.filtsep.com/content/features/setting-standards-f...

HEPA filter element
:
• Inner sealing (filter seat) according to DIN 25 496 Leakage volume flow < 3 · 10 -5 of rated volume flow at Δp = 2,000 Pa
https://www.peekbv.nl/wp-content/uploads/2013/11/M-RHF_hight...

Laminar Air Flow (Horizontal) (PLT-270)
:
• All interior surfaces are epoxy painted b>filter seat is carefully formed, installed and checked for leakage.
• :
• Side panels & front doors are made of 6 mm thick acrylic transparent plexi glass.
• The highly efficient HEPA filter maintains the optimum cleanliness and purity.
• The pre-filter fitted extends the life of HEPA filter drastically. Air drawn through pre-filter is made to pass through highly effective HEPA (High Efficiency Particular Air) filters having efficiency rating as high as 99.99% with cold DOP and 99.97% with hot DOP, thus retaining all air-borne particles of size 0.3 micron and larger.
http://www.tancolabproducts.com/laminar-air-flow-horizontal....

Anm.: Als Fertigungsinspektor hatte ich bereits Werkbänke mit HEPA-Feinfiltern geprüft und später auch HEPA-Filterdokumentationen übersetzt.