Valves and Valve Spares

A valve has three sealing zones. The seat seals the closure element against flow, the stem seal keeps the medium inside the valve around the moving stem, and the body or bonnet joint seals the valve shell. Most leakage problems are traced to one of these, and each uses a different sealing product: elastomer or PTFE seats, packing or O-ring stem seals, and gaskets at the bonnet.

Most valve spares are sold as complete repair kits for a particular model, or as individual packing sets, seats and gaskets cut to size.

• Gate valves: stem packing, bonnet gaskets, wedge, seats.
• Globe valves: stem packing, discs, seat rings, bonnet gaskets.
• Ball valves: PTFE seats, stem seals, body seals, balls and stems.
• Butterfly valves: resilient liners/seats, stem seals, discs, actuators.
• Check valves: seats, springs, discs, flapper rubbers and gaskets.
• Needle, plug and diaphragm valves: needles, diaphragms, packings and seats.
• Actuators and handwheels: pneumatic and electric actuators, gearboxes, positioners on enquiry.

See graphite packing and compression packing for stem-packing options.

Values here are typical only; always confirm against the manufacturer's data for your application. Oxygen, hydrogen, potable-water and food-contact valves require technical review and the correct certification documents.

1. Read the body markings: manufacturer, size (DN or inches), pressure rating (PN or class), body material, and any model number.
2. Note the end connections: flanged, screwed, wafer, lugged or butt-weld, plus the flange standard.
3. Photograph the valve complete, the stem area and the tag.
4. State the medium, temperature and pressure.
5. Describe the fault: external leak, passing seat, seized stem.

A damaged or hot-worked valve may be worth replacing outright; discuss with us.

The more of the following you can supply, the faster the part can be identified and quoted.

• Make, model and tag number
• Size and pressure rating
• End connections and flange standard
• Body and trim material
• Medium, temperature and pressure
• Parts needed: kit, packing, seat, gasket or complete valve
• Photos of the valve and markings

Customers can enquire about genuine or compatible replacement parts for equipment from manufacturers such as Burgmann, John Crane, Chesterton, Grundfos, KSB, Flygt, Lowara, Goulds, Sulzer, Flowserve, Klinger, Flexitallic, Trelleborg and others. A genuine part is supplied by or made to the original equipment manufacturer's specification and part number. A compatible part is made to fit the same dimensions and duty, usually by another manufacturer, and may differ in material or finish. Compatible valve spares are made to fit common valve models, though seat hardness and stem tolerances may differ. For safety-critical valves the original manufacturer's specification should be followed. State clearly in your enquiry which you want, and say whether a part number or sample is available.

Globseals supports three ways to buy, and the right one depends on how well the part is defined.

• Buy online where a product listing shows a confirmed price. Products are being added to the shop progressively, so not every item in this category is listed yet.
• Request a quote for custom, bulk or unpriced items. Seals, kits and complete valves are quoted. Use the quote request page.
• Technical review when identification is unresolved. Examples include unmarked valves, high-pressure steam, hazardous media and actuated valves. Start with Find My Seal or upload a drawing.

You can also phone 011 079 6033 or WhatsApp 079 508 0989, or email info@globseals.com. See delivery and collection for how orders are handled; courier costs are quoted per order.

These pages help with identification and selection:

• Compression packing
• Graphite gaskets and packing
• PTFE gaskets and seals
• Hoses and fittings
• Pumps and pump spares
• Gasket material selection guide