An automated cast globe valve pairs an API 623 cast steel globe valve - a linear-motion throttling valve - with a multi-turn electric or pneumatic actuator for remote flow control. It owns the duty that ball and gate valves do not: precise regulation under a large pressure drop, in sizes NPS 2–24 and Class 150–2500. Specify it when the line needs to meter flow, not just stop it.
Product range and configuration
- Size: 2"~24"
- Rating: 150#~2500#
- Body: Carbon steel, stainless steel, alloy, Duplex SS
- Connection: RF, RTJ, BW
- Temp: -196~650℃
Specification
First-screen facts a buyer checks before reading further: will it fit the line, and when can it ship.
| Item | Specification |
|---|---|
| Product | Automated cast globe valve (electric or pneumatic actuated) |
| Design standard | API 623 / ASME B16.34; BS 1873 available for bidirectional duty |
| Size range | NPS 2–24 (DN50–600); NPS ≤2 high-pressure duty supplied as forged API 602 |
| Pressure class | ASME Class 150–2500 |
| Body / bonnet | Bolted bonnet, OS&Y, rising stem |
| Body material | WCB, WCC, LCB, LCC, WC6, WC9, CF8, CF8M, CF3M |
| Disc | Plug disc or flat disc; hard-faced optional |
| Ends | RF, RTJ, BW (ASME B16.5 / B16.47 / B16.25); face-to-face per ASME B16.10 |
| Seat leakage | ISO 5208 Rate A (soft) / Rate C–D (metal) |
| Operation | Handwheel, gear, electric actuator, pneumatic actuator |
| Low emission | API 624 qualifying packing; bellows seal optional |
| Certificates | ISO 9001 / API Monogram where licensed; EN 10204 3.1 MTC |
| MOQ | 1 set |
| Lead time | 7–15 days (stock sizes); 20–35 days (made-to-order + actuator) |
| Payment | T/T 30% advance + 70% against documents; L/C accepted |
| Warranty | 18 months actuator + 12 months valve body from shipment |
Operation
- Lever / Gearbox
- Pneumatic Actuator
- Electric Actuator
- Hydraulic Actuator
- Gas – hydraulic Actuator
- Electric – hydraulic Actuator
Available automation solution
- Remote Operated Valves (ROV)
- Motor Operated Valves (MOV)
- Hydraulically Operated Valves
- Gas Operated Valves
Features
Precise throttling. Perpendicular disc travel gives a controllable annular gap and good rangeability - the valve meters flow instead of just blocking it.
Heavy-duty API 623 body. Wall about 3 mm thicker than ASME B16.34 minimums and larger stem diameters resist erosion in high-velocity steam and chemical service.
Multi-turn automation. A globe valve actuator converts torque to stem thrust; electric and pneumatic versions both available with on/off or modulating control.
Renewable, hard-faced trim. Seat rings and plug faces can be Stellite- or Inconel-overlaid for wear and cavitation resistance.
Low-emission options. API 624 qualifying packing, and a bellows sealed globe valve version for toxic or flammable service with zero stem leakage to atmosphere.
Full-stroke disc guiding. Required by API 623, it keeps the plug aligned under high thrust and reduces seat scoring.
Backseat for live packing change. OS&Y stem seats a backseat at full open, allowing gland packing replacement under pressure (verified by a backseat test).
Sour and high-temperature capability. NACE MR0175 / ISO 15156 trim and WC6/WC9 or CF8M bodies cover steam, feedwater and sour duty.
Materials and Trim
| Part | Standard material | Optional / service-specific |
|---|---|---|
| Body / bonnet | A216 WCB (carbon steel) | WCC, LCB/LCC (low temp), WC6/WC9 (Cr-Mo), CF8/CF8M/CF3M (stainless) |
| Plug / disc | 13Cr (A182 F6a) | 410, 304, 316, Stellite or Inconel overlay |
| Seat ring | Renewable, integral or threaded | STL hard-facing, Inconel overlay |
| Stem | A182 F6a / 410 | Nitriding or hard-facing for wear |
| Packing | Graphite (API 624 low emission) | PTFE (low temp), bellows seal |
| Gasket | Spiral-wound (graphite filled) | Flexitallic, corrugated for high temp |
For sour service, trim and body are selected to NACE MR0175 / ISO 15156 with hardness control and post-weld heat treatment; for steam and feedwater, WC6/WC9 or CF8M with Stellite-faced seats resist erosion. Soft-seated versions close to ISO 5208 Rate A; metal-seated versions run Rate C–D.
Applicable industry
- Petrochemical & refinery plants
- LNG
- Marine, paper mill & minerals processing
- Power plant
- Cryogenic or high-temperature process modified design
- Chemical industries
Quality Control and Testing
Every valve is tested individually before release. The shell test pressurises the body and bonnet to 1.5× the cold working pressure (zero structural leak). The seat test verifies closure: a globe valve low pressure pneumatic seat test at 4–7 bar air is the sensitive check for soft seats, while metal seats are also verified at 1.1× with a drops/min allowance by size. An OS&Y globe valve backseat test (gland removed, 1.1× CWP, zero leak past the backseat) confirms the live-packing-change feature. Seat leakage is reported as an ISO 5208 rate - Rate A for bubble-tight soft seats, Rate C–D for metal seats.
Common specification error - seat-leakage class. Writing "Class VI per API 598" for a globe valve is incorrect. API 598 is a valve inspection and pressure-test standard whose seat-leakage classes run A through F and align with ISO 5208; "Class VI" belongs to ANSI/FCI 70-2, the control-valve leakage system. A cast globe valve seat is rated under ISO 5208 (Rate A for soft seats, Rate C–D for metal seats) - not under a control-valve class. Also avoid copying the gate-valve "do not throttle" rule onto a globe valve: throttling is the globe valve's job, and calling a globe valve "low pressure loss" contradicts Crane TP-410 (L/D ≈ 340).
Low-emission packing is qualified to API 624 low emission; the metal seat and graphite packing then give a secondary seal after a fire (API 607 fire-safe for soft-seated versions). EN 10204 3.1 material certificates and test reports ship with every valve; third-party inspection (SGS, BV, TÜV, DNV, Lloyd's) is witnessed at the factory on request.
Tell us the size, ASME class, body/trim material, end connection, flow direction, ISO 5208 seat class and actuator type (electric or pneumatic, on/off or modulating, fail position). We return a tested, actuated valve with 3.1 MTC and test reports.
Packaging, Lead Time and Payment
Packaging: plywood cases with internal bracing; stem and flange faces protected; bellows-sealed and actuated units crated with the actuator secured and the stem locked in a defined position.
Marking: size, class, body/trim material, standard, serial and API Monogram (where licensed) per ASME B16.34; actuator tag with fail position and signal.
Lead time: 7–15 days for stock sizes and materials; 20–35 days for made-to-order bodies, special trim, exotic alloy, sour-service qualification or a paired actuator.
Port: Tianjin / Shanghai; CIF or FOB per Incoterms.
Payment: T/T 30% advance + 70% against shipping documents; L/C at sight accepted.
Warranty: 18 months on the actuator, 12 months on the valve body from shipment; spare trim kits available.
Why Source from GNEE
Trading-and-manufacturing integration. We consolidate foundry, machining, actuator and testing so one order delivers a tested, actuated valve - not loose parts from three suppliers.
Standards discipline. API 623 vs BS 1873, flow direction, ISO 5208 rate and actuator thrust are fixed on the order, not left ambiguous.
Documented testing. 3.1 MTC, shell/seat/backseat test reports and optional third-party witness against your PO.
Export record. 160+ customers across refineries, power, petrochemical and water projects; English drawings and ITPs supported.
Customisation. Special trim, exotic alloy, bellows seal, sour service and OEM/ODM to your drawing.
FAQ
What is the difference between a globe valve and a gate valve?
A globe valve moves the disc perpendicular to the seat, so it holds any intermediate position and regulates flow - at the cost of a high pressure drop (Crane TP-410 L/D ≈ 340 for a Z-body). A gate valve gives a straight-through full bore with very low drop (L/D ≈ 8) but must not be throttled; partially open, its wedge erodes. Use a cast globe valve for flow control and a gate valve for on/off isolation.
Can an automated cast globe valve be used for throttling?
Yes. Throttling is the globe valve's primary duty. The annular gap between the disc and seat is finely controllable, giving precise regulation and good rangeability. An automated globe valve does this with a multi-turn actuator: an on/off version drives fully open or closed, while a modulating globe valve accepts a 4–20 mA signal through an integral positioner to hold any travel position.
What actuator does a globe valve need?
A globe valve needs a multi-turn actuator, not a quarter-turn one. The actuator converts rotary output torque into linear stem thrust through a gearbox, and the seating thrust rises with differential pressure. Size from the valve maker's thrust data at breakaway-open and final-seating, then apply a 1.25–1.5 safety factor (lean toward 1.5 for modulating service). Electric and pneumatic actuators are both offered.
What does ISO 5208 Rate A mean for a globe valve seat?
ISO 5208 Rate A is the tightest leakage class: no visible leakage (bubble-tight) under the specified closure test. Soft-seated automated cast globe valves are specified to Rate A; metal-seated versions are normally Rate C or Rate D, with higher allowances by size. Always state the ISO 5208 rate on the purchase order rather than a generic 'zero leakage' claim.
Is "Class VI per API 598" a correct seat-leakage class for a globe valve?
No. Writing 'Class VI per API 598' for a globe valve is incorrect. API 598 is a valve inspection and pressure-test standard; its seat-leakage classes run A through F and align with ISO 5208. 'Class VI' belongs to ANSI/FCI 70-2, the control-valve leakage system. A cast globe valve seat is rated under ISO 5208 (Rate A for soft seats, Rate C–D for metal seats) - not under a control-valve class.
Does an automated globe valve provide double block and bleed (DBB)?
No. A single automated cast globe valve is a one-way or bidirectional isolation valve, but it is not a DBB valve. DBB requires two seats with a bleedable cavity between them - a capability of purpose-built DBB ball valves or two isolation valves with a bleed valve between. If your line needs verified double isolation, specify a DBB ball valve or two globe/gate valves with an intervening bleed.
Why does a globe valve have such a high pressure drop?
The disc travels perpendicular to the seat, forcing the flow through a Z-shaped (or Y/angle) path that changes direction twice. Per Crane TP-410 the full-open resistance coefficient is L/D ≈ 340 for a Z-body globe, against ≈ 8 for a gate valve and ≈ 3 for a ball valve. That loss is the trade-off that makes the annular gap controllable - which is exactly why the globe valve is the choice for throttling, not for low-loss isolation.
Which flow direction should I specify for a cast globe valve?
The default is low-in, high-out (flow under the seat): lower operating thrust and the packing stays unpressurised when closed. High-in, low-out is used for high-pressure steam and boiler feedwater, where line pressure helps seat the disc. API 623 admits only low-in-high-out; reverse flow must go to a BS 1873 valve. Flow direction is cast into the body and cannot be changed after the valve is made, so state it on the order.
What is the difference between API 623 and BS 1873 cast globe valves?
API 623 is the modern heavy-duty standard written to mirror API 600 gate valves: wall thickness about 3 mm heavier than ASME B16.34 minimums, larger stem diameters, full-stroke disc guiding, and mandatory low-emission packing per API 624. BS 1873 is the older British standard for general utility and isolation duty and is the only one of the two that admits bidirectional flow. For refinery and petrochemical throttling service, API 623 is the usual specification.
How do you prevent cavitation in a throttling globe valve?
Because a globe valve deliberately takes a large pressure drop, liquid service can cavitate at the vena contracta. Countermeasures are built into the trim: multi-stage pressure-drop cages, hardened or Stellite-faced plug and seat, balanced-plug designs that reduce required actuator thrust, and downstream baffles that restore back-pressure gradually. Specify anti-cavitation or low-noise trim for high-differential liquid and high-velocity gas duty.
What is the minimum order quantity and lead time for an automated cast globe valve?
MOQ is 1 set. Stock of common sizes and materials (WCB, CF8M) ships in 7–15 days; made-to-order valves with special trim, exotic alloy, sour-service qualification or a paired actuator ship in 20–35 days. Actuator lead time depends on the model and fail-position; confirm at quotation.
Do you provide material test certificates and third-party inspection?
Yes. Each valve ships with an EN 10204 3.1 material test certificate and a hydrostatic/shell and seat test report. Third-party inspection by SGS, BV, TÜV, DNV or Lloyd's Register can be witnessed at the factory against your purchase order, including PMI, NDE and low-pressure pneumatic seat testing where specified.