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BAUTU GB/T 12237 metal-seated ball valve, flanged, PN16–PN40

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TEST

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Metal-seated ball valve · Chinese standard · Made in Wenzhou

GB/T 12237 Metal-Seated Ball Valve — Lever Operated

MODEL Q41Y · GB/T 12237 · HAND LEVER

Flanged floating ball valve to the Chinese national standard GB/T 12237, with a hardfaced ball and metal seats instead of PTFE, for lines up to +420 °C or media with particles that would wear out a soft seat. PN16 to PN40, DN15 to DN200, opened and closed by a quarter-turn hand lever.

SizeDN15–DN200

RatingPN16 / 25 / 40

BodyWCB · CF8 · CF3M

SeatMetal, hardfaced

Temperature−29 to +420 °C

OperationHand lever

Hardfaced ball and seats for hot media and media with solid particles
Every valve shell and seat tested per JB/T 9092, test report in every shipment
Standard sizes ship in 15–20 days

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An engineer replies within 24 hours. Send size, PN, material and quantity. Download GA drawing (PDF) →

Specifications Materials Dimensions Pressure rating Testing How to order Video FAQ

Specifications

Technical Data

Design standard	GB/T 12237
Face-to-face	GB/T 12221
Flanges	HG/T 20592, raised face
Size range	DN15–DN200
Pressure rating	PN16 / PN25 / PN40
Body material	WCB (A216) · CF8 (A351) · CF3M (A351)
Ball and seats	Stainless steel (F304 / F316L), hardfaced to suit the service: hard chrome plating (HCr), nickel alloy (Ni55 / Ni60), tungsten carbide (WC) or Stellite (STL)
Temperature	−29 °C to +420 °C (limited by body material and pressure)
Gasket and packing	Spiral-wound gasket, flexible graphite packing
Construction	Two-piece body, floating ball
Top flange	Drilled to ISO 5211 (F05–F14), see dimension table
Operation	Quarter-turn hand lever; actuator with bracket and coupling
Media	Water, oil and gas
Testing	JB/T 9092 — every valve

Application

Where It Is Used

For lines built to Chinese standards where the temperature or the media would damage a PTFE seat. Below +150 °C with clean media, a soft-seated valve seals tighter and costs less.

Hot oil and thermal oil lines
High-temperature water and gas lines
Media carrying particles or scale that would cut a PTFE seat
Projects and plants designed to GB standards
Chemical lines (CF3M body)

Ball valve assembly hall at the BAUTU plant in Wenzhou

ASSEMBLY HALL · WENZHOU

Construction

Parts & Materials

From our Q41Y PN16, PN25 and PN40 general assembly drawings. Ni55 / Ni60 = nickel-base alloy, WC = tungsten carbide, STL = Stellite; the hardfacing is chosen to suit the service. Hard chrome plating (HCr) is also available; the hardfacing is selected to order.

Part	WCB body	CF8 body	CF3M body
Body / Bonnet	A216 WCB	A351 CF8	A351 CF3M
Ball	A182 F304 + Ni60 / WC / STL	A182 F304 + Ni60 / WC / STL	A182 F316L + Ni60 / WC / STL
Seat	A182 F304 + Ni55 / WC / STL	A182 F304 + Ni55 / WC / STL	A182 F316L + Ni55 / WC / STL
Stem	17-4PH	A182 F304	A182 F316L
Disc springs	17-7PH	17-7PH	17-7PH
Support ring	A276 304	A276 304	A276 316L
Body gasket	Spiral wound, SS304 + graphite	Spiral wound, SS304 + graphite	Spiral wound, SS316L + graphite
Seal ring / Stem packing	Flexible graphite	Flexible graphite	Flexible graphite
Gland	A351 CF8	A351 CF8	A351 CF3M
Studs / Nuts	A193 B7 / A194 2H	A193 B8 / A194 8	A193 B8 / A194 8
Lever	A216 WCB	A216 WCB	A216 WCB

Dimensions

Dimensions (mm)

PN16 — flange and length

DN	NPS	L	D	D1	D2	T	f	n-Ød
15	½″	130	95	65	45	16	2	4-Ø14
20	¾″	130	105	75	58	18	2	4-Ø14
25	1″	140	115	85	68	18	2	4-Ø14
32	1¼″	165	140	100	78	18	2	4-Ø18
40	1½″	165	150	110	88	18	2	4-Ø18
50	2″	203	165	125	102	18	2	4-Ø18
65	2½″	222	185	145	122	18	2	8-Ø18
80	3″	241	200	160	138	20	2	8-Ø18
100	4″	305	220	180	158	20	2	8-Ø18
125	5″	356	250	210	188	22	2	8-Ø18
150	6″	394	285	240	212	22	2	8-Ø22
200	8″	457	340	295	268	24	2	12-Ø22

PN25 — flange and length

DN	NPS	L	D	D1	D2	T	f	n-Ød
15	½″	130	95	65	45	16	2	4-Ø14
20	¾″	130	105	75	58	18	2	4-Ø14
25	1″	140	115	85	68	18	2	4-Ø14
32	1¼″	165	140	100	78	18	2	4-Ø18
40	1½″	165	150	110	88	18	2	4-Ø18
50	2″	203	165	125	102	20	2	4-Ø18
65	2½″	241	185	145	122	22	2	8-Ø18
80	3″	283	200	160	138	24	2	8-Ø18
100	4″	305	235	190	162	24	2	8-Ø22
125	5″	381	270	220	188	26	2	8-Ø26
150	6″	403	300	250	218	28	2	8-Ø26
200	8″	502	360	310	278	30	2	12-Ø26

PN40 — flange and length

DN	NPS	L	D	D1	D2	T	f	n-Ød
15	½″	140	95	65	45	16	2	4-Ø14
20	¾″	152	105	75	58	18	2	4-Ø14
25	1″	165	115	85	68	18	2	4-Ø14
32	1¼″	178	140	100	78	18	2	4-Ø18
40	1½″	190	150	110	88	18	2	4-Ø18
50	2″	216	165	125	102	20	2	4-Ø18
65	2½″	241	185	145	122	22	2	8-Ø18
80	3″	283	200	160	138	24	2	8-Ø18
100	4″	305	235	190	162	24	2	8-Ø22
125	5″	381	270	220	188	26	2	8-Ø26
150	6″	403	300	250	218	28	2	8-Ø26
200	8″	502	375	320	285	34	2	12-Ø30

Top works — PN16, PN25 and PN40

DN	NPS	Stem F × ØY	Top flange ØE / ISO 5211	Top flange bolts	Lever M
15	½″	9×Ø14	50 / F05	4-M6	160
20	¾″	9×Ø14	50 / F05	4-M6	160
25	1″	10×Ø16	50 / F05	4-M6	180
32	1¼″	10×Ø16	50 / F05	4-M6	180
40	1½″	14×Ø20	70 / F07	4-M8	230
50	2″	14×Ø20	70 / F07	4-M8	230
65	2½″	16×Ø24	90 / F09	4-M10	270
80	3″	17×Ø26	90 / F09	4-M10	310
100	4″	17×Ø26	90 / F09	4-M10	310
125	5″	21×Ø32	102 / F10	4-M10	600
150	6″	24×Ø36	125 / F12	4-M12	700
200	8″	27×Ø40	140 / F14	4-M16	800

From our Q41Y PN16, PN25 and PN40 general assembly drawings. L = face-to-face (GB/T 12221) · D = flange O.D. · D1 = bolt circle · D2 = raised face O.D. · T = flange thickness · f = raised face height · n-Ød = bolt holes · Stem F × ØY = stem flats × stem diameter · ØE = top flange bolt circle · M = lever length. Flanges to HG/T 20592.

PN16 GA Drawing (PDF)PN25 GA Drawing (PDF)PN40 GA Drawing (PDF)

Face-to-face length of a ball valve checked with a caliper

FACE-TO-FACE CHECK

Quality certificate tag on a BAUTU ball valve

QC TAG ON EVERY VALVE

Checked before packing

Face-to-face and flange dimensions are checked with calipers against GB/T 12221 and HG/T 20592 before packing. Each valve gets a QC tag with model, size, rating and inspector.

Pressure rating

Pressure Rating

Rating	Nominal pressure (MPa)
PN16	1.6
PN25	2.5
PN40	4.0

Nominal pressure at room temperature. The allowed pressure falls as the temperature rises; send us the design pressure and temperature and we confirm the rating.

Testing

Pressure Test on Every Valve

Test	Pressure
Shell test (water)	PN16: 2.4 · PN25: 3.75 · PN40: 6.0 MPa
Seat test (water)	PN16: 1.76 · PN25: 2.75 · PN40: 4.4 MPa
Seat test (air)	0.6 MPa

Tested per JB/T 9092. Test pressures from our Q41Y GA drawings; actual values for each valve are on the test report.

Checking stainless steel ball valve bodies with a handheld spectrometer

MATERIAL CHECK · SPECTROMETER

▶ PRESSURE TEST VIDEO

Quality records

Mill Test Certificate (EN 10204 3.1) in Every Shipment

Heat number of the body casting
Chemical composition against ASTM limits
Mechanical properties: tensile, yield, elongation
Shell and seat test pressure and hold time per JB/T 9092
Signed and stamped by our QC department

BAUTU ball valve mill test certificate, EN 10204 type 3.1 sample with heat number, chemical composition and mechanical properties

SAMPLE MTC · EN 10204 3.1 · CLICK TO OPEN

We welcome third-party inspection (e.g. SGS or BV), arranged and paid for by the buyer; inspectors get full access to our plant and test bench.

Download Sample MTC (PDF)

How to order

Model Code Q41Y-16C

QBall valve

4Flanged ends

1Floating ball, straight-through

YHardfaced metal seat

16PN16

CBody material (C = WCB)

No “G” in front of the code means the standard (low) top flange. CF8 and CF3M bodies carry their own material letter; we confirm the full code on the order confirmation.

Send us these 8 details for a fast quote

Size (DN)
Pressure rating (PN16 / 25 / 40)
Body material (WCB / CF8 / CF3M)
Media, with any solids or particles
Operating temperature and pressure
Lever, or actuator type
Quantity
Destination port

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Made in one plant

From Machining to Crate in Wenzhou

Machining a stainless steel ball valve body

01 MACHINING

Drilling the flange bolt holes of a ball valve body

02 DRILLING

Tightening body bolts during ball valve assembly

03 ASSEMBLY

Ball valve clamped in the API 598 hydraulic test press

04 PRESSURE TEST

See the valve before you order

Real footage of the valve from our plant. Want to see your own order? Book a live video call and we show your valves on the test bench.

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Export crates ready to ship in front of the BAUTU plant in Wenzhou

CRATED AT OUR PLANT

Packing & delivery

Packed for Sea Freight

Flange faces capped to protect the raised face
Each valve bagged; the order packed in plywood cases
MTC (EN 10204 3.1) inside every case
Standard sizes ship in 15–20 days

FAQ

Frequently Asked Questions

When should I choose a metal-seated ball valve instead of a soft-seated one?

When the line runs hotter than a PTFE seat can take (+150 °C, or +180 °C with RPTFE), or when the media carries particles, scale or crystals that would cut a soft seat. For clean media at lower temperatures, a soft-seated valve such as our GB/T 12237 manual ball valve seals tighter and costs less.

Which hardfacing: nickel alloy, tungsten carbide or Stellite?

All three are hard coatings on the ball and seat faces. Nickel alloy suits general hot service, tungsten carbide resists heavy abrasion, and Stellite keeps its hardness at high temperature. Tell us the media, temperature and pressure and we choose the hardfacing with you; it is stated on the order confirmation.

What is GB/T 12237?

It is the Chinese national standard for steel ball valves with flanged and welded ends. Our GB/T 12237 valves use GB/T 12221 face-to-face lengths and HG/T 20592 flanges, measured in DN sizes and PN ratings, and are inspected per JB/T 9092.

Can I fit an actuator?

Yes. The top flange is drilled to ISO 5211 (sizes in the dimension table), and we supply the bracket and coupling for your actuator. Send us the actuator make and model with your enquiry.

Which body material should I choose: WCB, CF8 or CF3M?

WCB carbon steel for non-corrosive water, oil and gas. CF8 (cast 304) for general corrosion resistance. CF3M (cast 316L) for chlorides, seawater and chemical service.

What documents ship with the valve?

A product test report with the heat number of the body casting, chemical composition, mechanical properties and the pressure test results. We welcome third-party inspection (e.g. SGS or BV), arranged and paid for by the buyer.

What is the lead time?

Standard sizes ship in 15–20 days from stock. Special materials or options may take longer; we confirm the delivery date with your quote.