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BAUTU flanged swing check valve, ASME Class 150

Stainless steel check valve bodies with cast DN and PN markings

CHECK VALVE BODY

Cast stainless steel check valve bodies in the BAUTU plant

CAST BODIES

Check valves bagged with flange caps for shipment

PACKED

Swing check valve · American standard · Made in Wenzhou

API 594 Flanged Swing Check Valve — Class 150, NPS ½″ to 12″

SWING · BOLTED COVER · ASME CLASS 150 FLANGES

Flanged swing check valve that opens with forward flow and closes on reverse flow, to protect pumps and lines from backflow. ASME Class 150, NPS ½″ to 12″, in WCB, CF8 or CF3M, for water, oil products and steam.

SizeNPS ½″–12″

Class150

BodyWCB · CF8 · CF3M

TypeSwing, bolted cover

FlangesASME Class 150 RF

Temperature−29 to +550 °C

Bodies cast in our own foundry, traceable to the heat number
Every valve shell and seat tested per API 598, 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	API 594
Face-to-face	ASME B16.10
Flanges	ASME Class 150, raised face
Size range	NPS ½″–12″ (DN15–DN300)
Pressure class	Class 150
Body material	WCB (A216) · CF8 (A351) · CF3M (A351)
Type	Swing disc on a hinge arm, bolted cover
Seating	Hard seal, metal-to-metal; disc and seat faces hard-faced with iron-based alloy or Stellite (cobalt-based) to order
Temperature	−29 °C to +550 °C depending on body material and trim
Media	Water, oil products and steam
Testing	API 598 — every valve

Application

Where It Is Used

For horizontal lines, or vertical lines with upward flow, where reverse flow must be stopped automatically.

Pump and compressor discharge lines
Chemical lines with corrosive media (CF3M body)
Water supply and treatment
Oil, chemical and power plant lines designed to ASME standards

Valve assembly hall at the BAUTU plant in Wenzhou

ASSEMBLY HALL · WENZHOU

Construction

Parts & Materials

From our H44W-16 general assembly drawing (CF3M body). WCB and CF8 versions are built the same way with matching trim; we confirm the bill of materials with your quotation.

Part	Material (CF3M valve)
Body	A351 CF3M
Body seat	316L
Disc	A351 CF3M
Hinge arm	A351 CF3M
Hinge pin	304
Cover	A351 CF8
Cover gasket	304 + flexible graphite
Studs / nuts	304
Lifting eye	304

Features

Materials selected to Chinese and international standards
Disc and seat sealing faces hard-faced with iron-based alloy or Stellite cobalt alloy: wear-, heat- and corrosion-resistant, long service life
Flanges and flange facings to the standard your project uses
Wide choice of body materials and gaskets matched to pressure, temperature and media

Dimensions

Dimensions (mm)

Face-to-face to ASME B16.10, flanges to ASME Class 150. Unit: mm.

Class 150, NPS ½″–12″

NPS	d	L	D	C	g	T	t	H	n-Ød
½″	15	108	89	60.5	35	12	1.6	–	4-Ø15
¾″	20	117	98	70.0	43	12	1.6	–	4-Ø15
1″	25	127	108	79.5	51	12	1.6	–	4-Ø15
1¼″	32	140	117	89	64	13	1.6	–	4-Ø15
1½″	40	165	127	98.5	73	15	1.6	–	4-Ø15
2″	50	203	152	120.5	92	16	1.6	161	4-Ø19
2½″	65	216	178	139.5	105	18	1.6	180	4-Ø19
3″	80	241	190	152.5	127	19	1.6	190	4-Ø19
4″	100	292	229	190.5	157	24	1.6	203	8-Ø19
5″	125	330	254	216	186	24	1.6	229	8-Ø22
6″	150	356	279	241.5	216	26	1.6	257	8-Ø22
8″	200	495	343	298.5	270	29	1.6	292	8-Ø22
10″	250	622	406	362	324	31	1.6	355	12-Ø25
12″	300	698	483	432	381	32	1.6	396	12-Ø25

d bore · L face-to-face · D flange outside diameter · C bolt circle diameter · g raised face diameter · T flange thickness · t raised face height · H height · n-Ød number and diameter of bolt holes.

CHECK VALVE BODIES

Checked before packing

Face-to-face and flange dimensions are checked against the drawing before packing. Each valve gets a QC tag with model, size, rating and inspector.

Pressure rating

Pressure Rating

Body material	Class 150, max. working pressure at 38 °C
WCB	19.6 bar
CF8	19.0 bar
CF3M	15.9 bar

Per the ASME B16.34 pressure–temperature ratings. The allowed pressure falls as the temperature rises.

Testing

Pressure Test on Every Valve

Test	Pressure
Shell test (water)	1.5 × rated pressure at 38 °C
Seat test (water)	1.1 × rated pressure at 38 °C

Tested per API 598. Actual values for each valve are on the test report.

Operator running a pressure test at the BAUTU test bench

HYDRAULIC TEST BENCH

SHELL & SEAT TEST

Quality records

A Product Test Report 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
Signed and stamped by our QC department

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 EN 10204 3.1 Report (PDF)

How to order

Model Code H44W

HCheck valve

4Flanged ends

4Swing type, single disc

WSeating faces machined on the body and disc material

Body material (WCB, CF8 or CF3M) is stated on the order. We confirm the full code on the order confirmation.

Send us these 7 details for a fast quote

Size (NPS ½″–12″)
Pressure class (Class 150)
Body material (WCB / CF8 / CF3M)
Media, temperature and flow direction
Quantity
Marking or nameplate needs
Destination port

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Made by BAUTU

From Casting to Crate

Pouring valve castings in the BAUTU foundry

01 CASTING

02 MACHINING

03 ASSEMBLY

Valve clamped in the hydraulic test bench

04 PRESSURE TEST

FINISHED VALVES

See the valve before you order

Want to see your own order before it ships? Book a live video call and we show your valves on the test bench.

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Finished valves bagged with flange caps on a pallet at the BAUTU plant

BAGGED & CAPPED

Packing & delivery

Packed for Sea Freight

Flange faces capped to protect the sealing face
Each valve bagged; the order packed in plywood cases
Product test report inside every case
Standard sizes ship in 15–20 days

FAQ

Frequently Asked Questions

How should a swing check valve be installed?

In horizontal pipe, or in vertical pipe with the flow going upward, with the arrow on the body pointing in the flow direction. It should not be installed in vertical pipe with downward flow.

What pressure and temperature can it handle?

ASME Class 150, from −29 °C up to +550 °C depending on body material and trim. Typical service is water, oil products and steam in oil, chemical and power plants. Tell us the media and temperature and we confirm the material and seat facing.

Why choose a swing check valve?

The disc swings fully out of the flow path, so the pressure drop is low. It suits pump discharge lines and larger sizes where a lift check valve would restrict the flow.

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

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

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. Large sizes and special options may take longer; we confirm the delivery date with your quote.