10K Non-rising Stem Gate Valve

Product Overview

The JIS 10K gate valve is a flanged, multi-turn isolation valve with a non-rising stem, built to the Japanese 10K pressure class. Turning the handwheel rotates a threaded stem that stays at a fixed height while the disc travels down inside the body, so the valve opens and closes without anything rising above the bonnet.

As a gate valve manufacturer, we cast and machine it in four body materials — HT200 grey iron, QT450 ductile iron, WCB carbon steel and CF8 stainless steel — with a bolted bonnet and flanged ends drilled to JIS. That spread lets one pattern cover treated water and wastewater on the iron bodies, and chemical, higher-temperature or mildly aggressive duty on WCB and CF8.

Buyers come to it from two directions. Importers and distributors stock it as a standard JIS 10K isolation item for water authorities, contractors and plant maintenance crews. Project and maintenance teams buy it to replace an existing non-rising stem flanged gate valve on a flanged joint already in the ground, where pipe centres, installed height and flange drilling all have to match what is there.

It is an isolation valve, not a control valve: it is meant to sit fully open or fully closed on water, wastewater, chemical and general industrial lines. Where a line needs throttling or frequent part-open regulation, a globe valve does that job better. For quarter-turn isolation on the same line, our ANSI ball valve range can be quoted with this valve.

Every valve is built against your line list, with size, pressure class and body material confirmed before production. As ball valve manufacturers, we can quote the DIN, ANSI and API 608 ranges on the same list. In urban water supply and chemical processing plants where overhead clearance is restricted, the non rising stem gate valve supports compact installation without sacrificing valve accessibility or operational control. The low-profile stem fits limited-headroom layouts, and technicians can rely on clear valve position indication and straightforward maintenance routines while the valve operates at 10K pressure ratings.

- Fixed stem height. The stem turns without rising, so the installed height stays constant and the top works never intrude on the space above the valve. - JIS 10K pressure class. Built to the Japanese 10K rating that water authorities and industrial contractors specify, matching the line class already written into the project instead of forcing a deviation. - Four body materials from one pattern. HT200 and QT450 for water and wastewater, WCB for steam and hot utility service, CF8 where chlorides or aggressive media would eat into iron. - Bolted bonnet. The top assembly can be lifted for gasket renewal or internal inspection without cutting the valve out of the line. - Flanged ends to JIS drilling. Drops onto standard flanged joints without adaptors, which matters most when the valve is going into a position that already exists. - Full-bore flow when open. Fully open, the disc clears the flow path completely and the line runs as though the valve were a short length of pipe.

Non-Rising Stem Construction

A thread that is never exposed. On the JIS 10K gate valve, the operating thread sits on the stem inside the bonnet, and the handwheel drives it in rotation only. As the handwheel turns, the disc moves along the stem and travels down into the body; the stem itself never leaves its position. Because that thread runs in a protected, greased space instead of open air, grit, dust and weather stay away from the part that wears fastest on an exposed design.

A working height that never changes. On a rising stem valve the handwheel climbs as the valve opens, so the operator's reach, the space above the valve and any access platform all have to be sized for the fully open position. With this non rising stem gate valve, the handwheel stays where it was installed. In a chamber, a plant room or a packaged skid, that removes a variable from the layout.

Nothing to bend or snag. There is no rising spindle to knock against a ceiling, a pipe rack or a chamber cover, and nothing protruding for a passing load or a ladder to catch. The silhouette of this flanged gate valve stays within the height of the valve body, which also makes the unit easier to lower through a hatch or manoeuvre through a doorway.

A bolted bonnet and a guided disc. Body and bonnet are joined by a bolted joint, so the top works can be opened, the gasket renewed and the internals inspected on site. The cast iron disc, faced with brass, is guided as it travels and presses onto the body seats at both ends of its stroke. Where a line list mixes valve types, we also supply the DIN and ANSI quarter-turn ranges as ball valve manufacturers.

Stem and trim matched to the body. The stem is stainless steel or brass depending on the body option, chosen so the packing area resists corrosion in the medium the valve is built for, and the handwheel is cast iron to match the body family.

One thing the pattern asks of the operator: because there is no stem travel to read, open and closed are tracked by handwheel turns rather than by eye. We cover the practical procedure in the installation section below.

Operation and Performance

The industrial gate valve is operated by hand, multi-turn, and the effort per turn stays low across the size range because the thread does the work rather than leverage on the rim. Operators count turns instead of judging by feel, and a valve that has not been moved for a long stretch still turns when the time comes, because the stem thread has been sitting in a protected, greased space rather than in the weather.

Shut-off relies on the brass-faced iron disc pressing onto the body seats. Closed, the disc is loaded against both seat faces, which is how this pattern holds a seal on water and non-abrasive process media without a soft insert. As a gate valve manufacturer, we inspect to KS B 2304, which covers the shell test at the 10K class and the seat and seal test, so seating behaviour is checked before each valve leaves the works.

Media and temperature decide how long that behaviour lasts. On treated water and wastewater the iron bodies give long, uneventful service. On steam, hot water or mildly aggressive chemical duty, the WCB and CF8 options keep the seats and stem in condition far longer. Tell us the medium and the working temperature at specification stage and we will confirm which body and trim set suits it.

The one habit worth enforcing is keeping the valve fully open or fully closed. A gate valve cracked open to trim flow puts the edge of the disc directly into the flow path; the seat erodes, the disc chatters and shut-off quality drops off. If a line genuinely needs part-open regulation, a globe valve is the right pattern for that duty; where quarter-turn isolation is wanted instead, a DIN ball valve is the alternative.

Servicing is infrequent by design. The packing gland is the only routine wear point, and a slight weep there is normally settled by a small, even adjustment rather than by tightening the gland hard. Everything else — disc, seats, stem thread — moves only when the valve is operated. For plants that also standardise on quarter-turn isolation, we also serve as a ball valve supplier for the DIN and ANSI quarter-turn ranges, so both can be planned on the same maintenance schedule.

Low-Headroom Installation

Headroom problems usually surface after the pipe route is fixed, when a chamber cover, a ceiling void, a cable tray or the underside of a skid ends up directly above the valve position. With this non rising stem gate valve, the space the valve needs is the space it occupies on the day it is installed: the handwheel turns in its own plane and nothing moves upward during operation. That turns the clearance question into a single check rather than a check at every point between closed and open.

Two measurements are worth taking before the JIS 10K gate valve is ordered. The first is the installed height from the pipe centreline to the top of the handwheel. The second is the working circle around the handwheel — the rim needs enough room for an operator to grip and turn it while staying clear of whatever sits above. Leave lifting space as well, because the valve arrives as a complete unit and has to be lowered or raised into position.

The industrial gate valve suits the places where room is genuinely short: valve chambers set under road covers, plant rooms with low soffits, packaged skids where every millimetre of stack height counts, pipe tunnels and culverts, and buried runs where the valve has to sit below cover level. In all of these, a rising stem would demand a taller chamber or a cut-out in whatever sits above it.

There is also a failure mode worth avoiding. A rising stem valve installed too close to a cover will strike it part-way through opening; an operator who keeps turning bends the stem or strips the thread. With nothing to hit, that damage path disappears.

Where the line is to be insulated, the operating point moves outward rather than upward — give us the insulation thickness at specification stage and we will confirm how the handwheel should be arranged, including a stem extension where the cladding would otherwise swallow the rim. If a quarter-turn valve shares the same skid, we can act as your ball valve supplier and apply the same clearance check.

Replacement and Retrofit

1. Read the old flanged gate valve first. Note the size, the pressure class cast or stamped on the body, the body material and the flange drilling — a photo of the marking plus a tape across the flange faces saves a second site visit.
2. Check the three dimensions that decide fit: face-to-face length, flange outside diameter and bolt circle, and the installed height from the pipe centreline to the top of the handwheel.
3. Compare the new valve's installed height with the old one. On a straight replacement the old height is your reference, because everything above the valve was set around it.
4. Decide whether the body grade should stay the same or step up. Moving from HT200 to QT450 gives more strength and impact resistance at the same footprint; moving to CF8 is the sensible route when the old iron body has been corroding.
5. Plan the shutdown window properly. Drain and isolate the section, and have gaskets, bolting and lifting gear at the valve before the line comes down — most retrofit delays come from missing consumables, not from the valve.
6. Send us the old marking or drawing number with your enquiry and we will confirm the equivalent before you commit to the order.

Valve Types for the Same Line

• Quarter-turn isolation on the same line. Where the line list also calls for quarter-turn shut-off, we build the DIN ball valve series to the same standard families, so both valves can arrive on one packing list.
• North American specifications. Lines written to ANSI are covered by our ANSI ball valve range, quoted alongside this JIS gate valve for projects that mix standards in one plant.
• Hydrocarbon service. An API 608 ball valve is often specified for block-valve duty on oil, gas and petrochemical lines; we quote that series with the gate valve range so one order covers the whole list.
• Single-source marking. Ball valve manufacturers and gate valve factories are usually separate companies, so a mixed list means split deliveries and mismatched nameplates; taking both from one works keeps marking, packing and cartons consistent.
• Rising-stem alternative. Where the layout allows a taller valve and operators prefer to read position from stem travel, the same isolation duty is covered by our ANSI/AWWA rising stem gate valve.

Plant and Line Applications

• Municipal water supply and distribution. Isolation on trunk mains, district metered areas and branch connections, typically in a chamber where the valve is reached from above through the cover.
• Wastewater and sewage treatment. Sludge, effluent and recirculation lines around treatment works, where the iron body handles the duty and the compact top works suits covered channels and plant rooms.
• Chemical and process plants. Cooling water, utility headers and chemical feed lines on the CF8 or WCB options, keeping the pipe rack above the valve clear for trays and ductwork.
• Power plants and boiler houses. Service water, cooling water and auxiliary lines on the WCB option, where isolation points are worked during maintenance outages rather than daily.
• Pumping stations and irrigation networks. Pump discharge isolation and field distribution mains, where valves sit in chambers and are operated from above at infrequent intervals.

Body, Trim and Standards

Installation and Commissioning

1. Check the valve against the line list before it goes up: size, 10K rating, body material and flange drilling.
2. Mount it with the stem upright where the layout allows. A horizontal or inclined stem is sometimes unavoidable, but clear it with us first so the disc guide and packing are not working against the design.
3. Keep the valve closed during fitting, so debris cannot settle on the seat faces, then clean the flange faces and fit new gaskets.
4. Bring the joint together squarely and tighten the bolts in stages in a cross pattern. Pulling a joint closed with the bolts distorts the body and loads the seats.
5. Work the handwheel through its full travel before the line is pressurised and confirm the disc reaches both seats without binding.
6. Pressurise slowly and check the body-to-bonnet joint, the flange joints and the packing gland. A weep at the gland is normally settled by a small, even adjustment of the packing nut.
7. Mark the closed position on the handwheel and record the number of turns from fully open to fully closed. That record becomes the position reference for the rest of the valve's life.

Ordering and Delivery

• What to send with an enquiry. Size, quantity, pressure class, body material, flange drilling and the medium the valve will handle; for a replacement, add the marking from the old valve or its drawing number. - Customization. Non-standard face-to-face lengths, flange drilling, material combinations and marking can be worked through against your drawings — confirm the detail with your sales contact before production begins. - Order quantities and lead time. Both depend on size and material, so ask your sales contact to confirm them against your schedule when you enquire. - Export packing and shipping. Flange faces are protected for sea freight, and we handle export packing, customs documents and freight booking. - Payment and documents. Payment terms, Incoterms and the inspection or material records your project needs are agreed per order; tell us at enquiry which documents must travel with the shipment.

Scale & Supply Capability

LONGYAO WOYU VALVE CO., LTD. is a gate valve manufacturer with its own 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.

FAQ