RY-EA-N4 Eyewash Nozzle with Domed Stainless Steel Mesh Face, Yellow and Maroon Bodies

RY-EA-N4 Eyewash Nozzle with Domed Stainless Steel Mesh Face, Yellow and Maroon Bodies

Product Overview

The RY-EA-N4 is a screw-in eyewash nozzle whose face is a domed stainless steel woven mesh held under a plated rim, with the body moulded in plastic in two colours — a light yellow and a dark maroon. The mesh is pressed into a shallow dome above the rim, so the water leaves the face as a soft cone rather than a set of hard jets. The base is male threaded for direct fitting to a bowl, a spray head or a manifold. It is a service part: the nozzle that sits closest to the eye and takes the most abuse, replaced on the station when the pattern degrades or the mesh cannot be cleaned.

The Face That Makes the Flush Gentle Is the Part That Stores It

Why the mesh feels right. A fine woven face breaks the stream into a soft, wide cone, which is the difference between a flush a casualty will tolerate for fifteen minutes and one they will pull away from after twenty seconds. That comfort is not cosmetic — it is the mechanism by which the required flushing time actually gets delivered. A hard twin jet that hurts is a station that gets used for a minute and then abandoned.

What the same mesh holds. Every perforation in that face is a place where scale, iron oxide, pipe debris and biofilm collect, and it sits immediately upstream of the eye. This is the trade nobody puts on a datasheet: the part that makes the water gentle is also the part that concentrates whatever the water is carrying. Biofilm in a mesh is not removed by running the station for three minutes — the flow passes through it, not over it. The mesh has to be taken out and cleaned, and on a crimped-face nozzle it cannot be, which is why this type is a replaceable service part rather than a cleanable one.

The dark body hides the evidence. The two colour options are not purely a matter of taste. Scale, hardness deposit and biofilm show as a pale bloom against the yellow body and are almost invisible against the maroon one — and the mesh must be seen to be judged. A dark nozzle on a station that is maintained monthly looks cleaner than it is, which delays replacement. Where the nozzle is to be inspected by eye on a walk-round, the lighter body tells the truth sooner.

An Aerator Is Sized for a Tap, Not for an Eyewash

A nozzle of this construction — plated rim, domed mesh, plastic body — is the same family as a tap aerator, and aerators are designed to deliver a comfortable, restricted flow at domestic tap pressure. An eyewash is the opposite requirement: the two nozzles together must deliver at least 11.4 L/min, continuously, at 0.2–0.4 MPa. A face sized for a tap can leave a single-nozzle station short of that minimum, and the shortfall is invisible in use — the flush looks plentiful because it is wide and soft.

This is the reason the flow has to be measured on the assembled station, at both nozzles, rather than taken from the nozzle's own description. If the measured value is below the minimum, the answer is not to open the mesh (which destroys the pattern) but to fit a face sized for eyewash service. Note also that many aerator-type faces mix air into the stream; against an eye, entrained air dulls the mechanical flushing action, which is the part that actually removes the contaminant.

Two Materials, Two Failure Modes

The plated rim. The mesh is held by a rim that is crimped or rolled over it. At that crimp line the plating is under stress and it is where blistering starts; a peeled edge on a part 100 mm from the eye is a sharp edge, and it is also where water gets behind the mesh and holds it wet. Inspect the rim, not just the mesh.

The plastic body. Moulded plastic creeps under the compression of a threaded joint. A nozzle tightened firmly at installation relaxes over months, loses its aim and starts to weep at the thread. It is also temperature-limited: a hot flush softens the body and can let the face distort, which changes the cone on that nozzle only, so one eye receives a different pattern from the other. After any hot-water event, re-check both nozzles for match.

The dome is the aiming surface. The curvature of the mesh sets the spray cone. A knock that dents the dome alters the pattern on that nozzle alone, and an asymmetric flush is worse than a weak one because the casualty does not notice one eye is being under-irrigated. Nozzles are therefore replaced as a matched pair, not one at a time.

Key Features

• Domed stainless steel woven mesh face giving a soft, wide cone instead of hard jets.

• Two body colours — light yellow for inspection visibility and dark maroon for a discreet finish.

• Plated rim holding the mesh in a crimped face, so the mesh cannot work loose into the bowl.

• Male threaded base for direct fitting to a bowl, spray head or manifold.

• Face can be replaced as a unit when the mesh is blocked, scaled or dented.

• Compact face that fits within a standard eyewash bowl without obstructing the lid.

• Moulded plastic body with no metal in the water path at the thread, so no galvanic corrosion there.

• Available as a matched pair, so both nozzles of a station present the same cone.

• Individual packing, suitable for spare-part stock on a maintenance round.

Technical Specifications

Fitting

1. Isolate the supply, lock the valve off and release pressure before removing the old nozzle.

2. Clean the thread in the bowl or head, and check the new nozzle's thread engages by hand through its full length.

3. Fit by hand plus a part turn; do not use a wrench on the plastic body, which creeps and splits at the thread.

4. Fit both nozzles as a matched pair and check that the two cones are the same width and aim at the same point between them.

5. Operate the station and measure the combined flow at the nozzles; record it against the 11.4 L/min minimum.

6. Confirm the nozzles clear the bowl lid and that a cap, if fitted, closes without resting on the mesh.

Maintenance and Inspection

Weekly: operate the station for at least three minutes and look at both cones — a narrowing cone or a visible spray imbalance means the mesh is partly blocked.

Monthly: inspect the mesh against the light for scale and pale biofilm, and check the plated rim at the crimp for blistering or a lifted edge.

Quarterly: measure the combined flow and re-check the aim; compare the two cones and replace as a pair if one has been dented.

Annually: replace the nozzles if the mesh cannot be cleared, the rim has lifted, the body has distorted, or the thread no longer holds the aim.

Standards and Compliance

The nozzle is a component of an emergency eyewash, and the installed station must meet ANSI Z358.1-2014 in full: fifteen minutes of flushing with tepid water at 20–37 °C, a controlled twin stream at a velocity the casualty can tolerate, hands-free activation, the nozzles at the required height above the floor with the required clearance from the wall, and unobstructed access within ten seconds of the hazard. Two points follow from this product's construction. The station must deliver at least 11.4 L/min from both nozzles together, measured — a soft wide cone looks like ample flow and is not evidence of it. And the nozzle face must be capable of being kept clean; a crimped mesh that cannot be removed for cleaning must be replaced on a defined interval rather than assumed to be self-cleaning.

Applications

Replacement of blocked or dented nozzles on bowl-type eyewash stations, spare-part stock for maintenance rounds, stations where a softer cone improves the tolerated flushing time, and matching a pair of nozzles on a station where one has been replaced previously with a different face.

Ordering

State the model RY-EA-N4, the thread size or the make and model of the bowl or head it is to fit, the body colour, and the quantity. Specify a matched pair where both nozzles are being replaced. If the nozzles are being bought to fix a weak flush, state the measured flow of the station as it stands — a mesh face cannot add flow that the supply is not delivering, and a finer mesh will reduce it further.