Marine Cast Iron Globe Valves JIS F7307 10K

Marine Globe Valve Overview

The JIS F7307 10K is the cast iron globe valve of the Japanese marine valve series: a bolted-bonnet, rising-stem valve with flanged ends, built for flow control in shipboard piping. It is the pattern used on fuel oil, lubricating oil, water and steam lines, where regulating a flow and shutting it off both have to be done from the same handwheel.

The body is cast iron, the bonnet is bolted rather than welded, the stem rises as the valve opens, and both ends are flanged to the Japanese 10K marine pattern. Each of those details earns its place in a working engine room: the flanges land on the existing counter-flanges, the bonnet can be opened in place during an overhaul, and the height of the handwheel tells an engineer how far the valve is open from across the floor plates.

Shipyards, owners' technical departments and marine spare-parts agents tend to order this model with the other cast iron patterns in the same family — the screw-down check globe valve and the angle valves — because a dry-dock or engine-room refit usually needs the whole set rather than one valve. As a marine globe valve manufacturer, Woyu supplies this pattern against the line, the size and the trim you specify, and confirms the build before the valves are made.

- Bolted bonnet, not a welded body. The bonnet lifts off once the bolts are released, so the disc, the seat and the gland packing can be reached during an overhaul without cutting the valve out of the line. - Rising stem as a position indicator. The stem climbs as the valve opens and drops back as it closes, so handwheel height alone tells an engineer how far the valve is open — no indicator to fit and no actuator feedback to wire in. - Throttling, not only shut-off. The disc lifts progressively clear of the seat, which lets the valve hold a flow at part-open instead of swinging between fully open and fully closed the way a gate valve does. - Flanged ends for a straight swap. Both ends are flanged to the Japanese 10K marine pattern, so the valve lands on the existing counter-flanges rather than needing an adapter spool piece. - Manual handwheel operation. Nothing has to be piped or wired to the valve, which keeps auxiliary circuits simple and removes an instrument that could fail in a hot engine room. - Cast iron body at this pressure class. Cast iron is the body material of this rung of the marine series, and the finished valve is easier to lift and align in a confined space than a steel-bodied pattern of the same size.

Dimensions DN 50–DN 300

The table below gives the dimensions a marine globe valve manufacturer works to for this pattern.

Installation & Fit-Up

1. Read the marking on the old valve and on the new one before anything is unbolted — the nominal size and the pressure class are the two details that decide whether the replacement fits, and the two that globe valve manufacturers use to identify a pattern.
2. Compare the face-to-face length with the gap in the line, and check the bolt circle and hole count against the mating flanges; the joining table gives both for every size, and a globe valve supplier can confirm them if the old marking is unclear.
3. Clean both flange faces, fit a new gasket of the correct bore, and bring the valve up square — do not pull it into alignment with the bolts.
4. Fit the bolts and tighten them in a cross pattern in two or three passes so the gasket seats evenly.
5. Fit the valve the right way round: the flow arrow on the body points from the inlet face to the outlet face.
6. Leave clear space above the handwheel for the stem to rise; a rising stem needs headroom that a gate valve of the same size does not.
7. Once the line is back in service, check the bonnet joint and the gland for weeping, and re-torque the bonnet bolts after the line has been through its first hot cycle.

Shipboard Applications

• Fuel oil service and transfer lines. Trimming the flow at a burner or engine feed, then isolating the line when a filter, heater or pump is opened up.
• Lubricating oil circuits. Cutting off lube oil to a cooler, strainer or bearing branch for maintenance while the rest of the system keeps running.
• Cooling and general service water. Fresh water and sea water branches in the engine room, on the low-pressure duties this cast iron pattern is built for.
• Auxiliary steam. Heating, tracing and tank-cleaning lines within the valve's temperature rating, where the graphite packing and the metal seat do the work.
• Dry-dock replacement. Swapping a worn valve of the same pattern onto the original flanges and the original face-to-face length, so no pipe work has to be cut and re-welded — the replacement that globe valve manufacturers supply to the same standard drops straight in.
• Engine-room isolation points. A marine globe valve ahead of a pump, strainer or heat exchanger, where the fitting has to close for the job and then reopen to a set position rather than simply on or off.

Specifications

A globe valve supplier can confirm these figures against the marking on the valve.

Body & Trim Materials

Everything the medium touches is chosen from two build marks. In the first, the disc and seat are cast bronze in ZCuSn5Pb5Zn5 — the long-standing pairing for a cast iron valve on fuel oil, lubricating oil and water lines. In the second, the disc and seat are stainless steel, which holds a clean edge better where the valve is throttled often, and is the usual choice where the same pattern works in steam near the top of its temperature range.

The stem is stainless steel in both builds. The gland packing is flexible graphite, which stays serviceable at the hot end of the range where a softer packing would harden, grip the stem and start to weep.

Both builds share the same body, bonnet and flange dimensions, so the trim can be decided per valve without touching the pipe work, and a spares package can carry either. It is the one detail a globe valve manufacturer cannot settle on your behalf: put the medium and the working temperature on the enquiry and we will confirm which disc and seat to supply before the order goes into production.

If the pressure sits outside the 10K class or the medium is aggressive enough to attack a cast iron body, this is the wrong pattern for the line. Say so on the enquiry and we will quote the cast steel version of the same valve instead.

Care & Maintenance

Day-to-day care is mostly about using the valve the way it was designed to be used. Open and close it fully during each maintenance window rather than leaving it parked in one position for years; a disc that never moves takes a set against its seat and the packing stiffens. Keep the exposed stem wiped clean, because grit carried down the threads is what wears packing out, and never stand on the handwheel or fit a cheater bar to it — the stem, the bonnet joint and the seat all take that load.

Close the valve on normal hand pressure and no more. A valve forced shut distorts the seating face, and the next closure will weep however hard it is turned.

If the gland starts to weep, take up the packing nut a little at a time and let the valve run before taking any more; tightening until the nut will not turn does more harm than a slow seep. Treat the bonnet joint the same way — a small, even re-torque, not a long lever.

Ordering & Delivery

• Size and pattern. Give the DN and confirm the flanged 10K pattern you need. For a replacement, the marking on the old body is the safest reference.
• Trim build. Say bronze or stainless for the disc and seat; if the medium or the working temperature is unusual, describe it and we will confirm the build.
• Quantity and timing. Tell us how many valves and the date they are needed against the vessel's schedule or the project programme, and we will confirm availability and the delivery date that goes with it.
• Documents. Say which records your technical department wants with the valves — material certificate, pressure test record, dimensional drawing — and we will confirm what is provided for the size ordered.
• Testing. Seal test pressures for this pattern are listed with the specifications; ask for the shell test pressure and the test record that applies to the size you are ordering.
• Marking and packing. If the valves go into a stores system or a bonded spares package, tell us how they should be labelled and packed for the voyage.
• Compare like for like. Sizes, trim and test requirements differ between globe valve manufacturers, so quote the standard designation and the size rather than a brand name when you ask for a replacement.
• Where to send it. Email or WhatsApp the list to our sales contact with the size, trim and quantity, and add any question about testing or marking — those are easier to settle before the order is confirmed. As a globe valve supplier we answer on trim and test details directly, from the same drawings the valves are built to.

Scale & Supply Capability

LONGYAO WOYU VALVE CO., LTD. is a valve manufacturing factory exporting to buyers in more than 40 countries, including Russia and Central Asia, Pakistan and South Asia, Korea and Vietnam, and the Middle East. We build to German DIN, Russian GOST, American ANSI/AWWA, Japanese JIS and British BS standards, so an importer can assemble a full catalogue across series from one supplier. Orders can ship under your own brand: we handle nameplates, packing marks and carton labelling to your artwork, with the authorisation documents agreed before production. Send your item list and we will confirm availability and delivery date.

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