Festo GRP-160-PK-4 12961 Precision One-Way Flow Control Valve: Complete Technical Guide

7 februari 2026

Historical parts record: Photos and notes below belong to this record. Confirm the offered unit’s full model, condition and available test evidence before ordering.

What this delivery is: nineteen Festo GRP-160-PK-4 precision one-way flow control valves, material number 12961, brand new, with a one-year warranty — the record carries two purchase lines, six units received 2026-02-02 as bagged kits and thirteen units received 2026-03-14 in sealed Festo boxes, all one lot of the same part. The boxed thirteen are the clearest to identify: each white box carries the FESTO label — GRP-160-PK-4, Mat. No. 12961, Series 10-2025:23, 1 piece(s), Precision one-way flow control valve — and the side print names Festo SE & Co. KG, DE-73734 Esslingen, Made in India. The first six arrived as individually bagged kits: valve body, brushed-metal mounting plate and two socket-head screws per bag.

How the valve is built

The GRP is Festo's precision one-way flow control valve — the meter-out fitting you put on a cylinder's exhaust port when the stroke speed has to be exact rather than merely adjustable. The body is a black composite knob with a graduated ring from 0 to 10 and the FESTO 12961 marking on its face; a slotted screw in the centre sets and holds the position. Air enters through one of the twin brass studs on the metal faceplate and flows freely in one direction; reversed, it must pass the needle the knob positions, which is where the fine control happens. The separate mounting plate — a brushed disc with two fixing holes, a keyhole slot and the GRP-160-PK-4 12961 label of its own — lets the valve sit panel-mounted instead of hanging on its plumbing, and each bagged kit includes the two mounting screws.

Item	Value on the label / record
Product	Festo GRP-160-PK-4 precision one-way flow control valve, Mat. No. 12961
Box label	Series 10-2025:23; 1 piece(s) per box; Festo SE & Co. KG, DE-73734 Esslingen; Made in India; www.festo.com/sp
Construction	Black composite knob, 0–10 graduations, slotted setting screw; twin brass ports on a brushed faceplate
Mounting kit	Brushed mounting disc with fixing holes and keyhole slot; two socket-head screws; LDPE bag no. 213286
Condition / quantity	Brand new; 19 pcs total — 6 bagged kits (received 2026-02-02) + 13 boxed units (received 2026-03-14); 1-year warranty

Why nineteen of one fitting

Flow controls are set-and-forget parts, which is exactly why they disappear from stock: nobody notices the drawer is empty until a cylinder starts slamming and the line is down. A nineteen-piece buy in one material number is maintenance-stock logic for a plant with a bank of identical pneumatic stations — every cylinder station gets its meter-out fitting from the same drawer, and the set-point marked on the knob scale (0–10) reads the same from valve to valve. The two-batch history is ordinary replenishment: six in February, thirteen in March, same part, same material number, one from an Esslingen-labelled Indian build and all boxed units Series 10-2025:23.

Photos

Valve in its bag — One valve through its bag: black knob body, twin brass studs on the brushed faceplate — the bagged-kit form of the first batch.

Brass ports close-up — The port end in close-up: both brass studs clean and uncannied, knurled adjust ring wrapped in the LDPE bag.

Video walkthrough of a bagged kit.

Knob with 0-10 scale — The knob face: graduations 0 to 10 around the ring, Festo mark and 12961 at the top, slotted centre screw — the set-point scale that makes repeatable settings possible.

Mounting plate with screws — The mounting kit: brushed disc with two fixing holes and the keyhole slot, its own GRP-160-PK-4 12961 label, two socket-head screws in the 213286 bag.

Plates and valves laid out — Part of the bagged batch laid out: five labelled plates with their screw pairs above, seven bagged valve bodies below.

Plates and valve pairs — Plates and valves in pairs — each plate pairs with one valve body and two screws to make one install kit.

Plate bag with label — The plate bag sealed: GRP-160-PK-4 / 12961 label on the disc, screws beside it, LDPE recycling print 213286 on the film.

Plate and screws detail — Plate detail: the keyhole slot for panel hanging, the two through-holes, and the machined brush finish on the face.

Thirteen Festo boxes — The boxed thirteen: identical FESTO labels — GRP-160-PK-4, Mat. No. 12961, Series 10-2025:23, 1 piece(s) — thirteen sealed boxes in rows.

Port face through bag — The port face in close-up through the bag: twin brass studs, the slotted centre screw visible on the knob flank, mounting screw hole on the plate.

Full lot layout — The whole delivery in one frame: bagged valve bodies and labelled plates spread across the bench — the six-kit batch in loose form beside the boxed thirteen.

Knob marking close — Knob marking in close-up: the Festo wordmark with 12961 beside it, scale numerals crisp, arrow window seated at 0.

Knob face detail — Another knob from the boxed batch: same 0–10 ring, same 12961 marking — the print that ties every unit to the one material number.

Video pass over the boxed thirteen.

Box side print — The box sides: Festo SE & Co. KG, DE-73734 Esslingen, Made in India, www.festo.com/sp — thirteen identical side prints.

Box label macro — Label macro: GRP-160-PK-4, Mat. No. 12961, Series 10-2025:23, 1 piece(s), Precision one-way flow control valve.

Box label and barcode — The box bottom edge: Festo address block, Made in India, the part barcode and the handling pictograms.

Boxed unit valve — One valve from the boxed batch in its factory bag: same knob-and-stud build as the loose kits — one part number across both deliveries.

Related products on KOEED

Pneumatic neighbours in the catalogue: the Danfoss EV220B solenoid valve body covers the on/off switching side of the same air lines these flow controls meter.

Need GRP-160-PK-4 flow controls, another GRP size, or a datasheet check against your port layout? Send the material number — we confirm stock with photos.

Request a quote