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Pump Cover

The mating half, machined against the casing it closes.

Pump Cover

The mating half, machined against the casing it closes.

A cover is only as good as the face it seals against. Flatness across the joint and squareness of the spigot register to that face are the two things that decide whether the gasket holds and whether the rotating assembly ends up concentric.

Which is why covers and casings are quoted as a pair wherever we can. A cover machined to a nominal drawing will bolt onto a casing machined to the same drawing, but a cover machined against the actual casing will seal better every time.

Casting process	Vertical-line sand moulding on two lines (national patent)
Materials	Grey iron · ductile iron · WCB carbon steel · CF8M stainless
Machined features	Joint face · spigot register · bolt circle · seal recess if fitted
Minimum order	100 pieces
Certification	EN 10204 3.1 per heat, spectrometer results
Source of geometry	Your drawing, 3D file or a worn sample

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Casting Notes

What Is Difficult About This One

Every casting has one or two features that decide whether the batch repeats. On this part they are these.

Flat, so it wants to warp

A disc-shaped casting cools fastest at the rim. Ribs on the back and a feeding layout that keeps the hub hot longest is what stops it dishing.

Spigot cast proud

The register is cast oversize and turned. Cast it to size and there is nothing left to clean up when the mould moves.

Bolt bosses fed from the rim

Thin webs between them would starve the bosses. Section is kept even around the circle instead.

Materials

Alloy Options

The same geometry is a different part in three different plants. Chloride content, abrasion and temperature drive the choice — not the name of the fluid.

Alloy	Grade	When it is the right choice
Grey iron	HT200 / HT250	Default for water duty. Damps vibration, machines easily, lowest cost.
Ductile iron	QT450 / QT500	When the duty is cyclic or the part takes shock. Tougher than grey.
WCB carbon steel	ASTM A216 WCB	Higher strength, weldable. For pressure-bearing bodies.
CF8M stainless	ASTM A743 CF8M	Chloride and corrosion duty — the cast equivalent of 316.

Enquiry

What to Send Us

These are the ones specific to this part. A drawing, a 3D file or the worn original covers all of them at once.

Item	Why it matters
The casing it closes	A drawing of it, or the casing itself — the pair is what matters
Bolt circle and count	Diameter, hole count and clocking relative to the register
Whether it carries the seal	It changes the recess and the finish on the inside face