Product Overview

Spirax Sarco BSA and BSAT series are bellows sealed globe valves featuring double bellows seal design, suitable for steam, gas, liquid, condensate and water systems. The standard BSAT series is equipped with throttling disc and stem locking device, while the optional BSA series features flat disc design with optional balanced disc configuration. Products comply with European Pressure Equipment Directive 97/23/EC, and EN 10204 3.1 certificates are available for certain models (BSA2, BSA2T, BSA3, BSA3T) upon request at time of order.

Product Range and Options

Standard Series BSAT (with Throttling Disc and Stem Locking Device)

Material	Model	Connection Type	Size Range (DN)	Options
Ductile Iron	BSA2T	PN16, PN25, PN40	15, 20, 25, 32, 40, 50, 65, 80, 100, 125, 150, 200	R-PTFE Soft Seat
Cast Steel	BSA3T	ANSI 150, ANSI 300, KS 20	15, 20, 25, 40, 50, 80, 100, 150, 200	R-PTFE Soft Seat

Optional Series BSA (Flat Disc)

Material	Model	Connection Type	Size Range (DN)	Options
Ductile Iron	BSA2	PN16, PN25	125, 150, 200	Balanced Disc
Cast Steel	BSA3	PN40, ANSI 150, ANSI 300, KS 20	125, 150, 200	Balanced Disc

Dimensions/Weight (Approximate)

Size	A(PN)	A(JIS/KS 10K)	A(JIS/KS 20K)	A(ANSI 150)	A(ANSI 300)	B	C	Weight(BSA2 BSA2T)	Weight(BSA3 DIN)	Weight(BSA3 ANSI 150)	Weight(BSA3 ANSI 300 JIS/KS 20K)
DN15	130	133	152	108	152	205	125	4	4	5	6
DN20	150	153	178	117	178	205	125	4	5	6	7
DN25	160	163	200	127	203	217	125	5	6	8	9
DN32	180	183	-	-	-	217	125	7	8	-	-
DN40	200	203	224	165	229	243	200	10	11	10	11
DN50	230	229	259	203	267	243	200	12	14	12	15
DN65	290	293	-	-	-	263	200	16	19	-	-
DN80	310	309	304	241	317	287	200	21	26	25	29
DN100	350	349	340	292	356	383	315	36	44	41	49
DN125	400	395	-	-	-	416	315	52	64	-	-
DN150	480	479	428	-	445	450	315	75	88	-	94
DN200	600	592	537	-	559	622	500	145	-	-	193

Sealing Class and Kv Values

Sealing Class

• Disc/seat sealing complies with EN 12266-1 Class A and ISO 5208 Class A
• BSA3(ANSI) complies with API 598 zero leakage standard

Basic Kv Values (BSA Series)

Size (DN)	15	20	25	32	40	50	65	80	100	125	150	200	250
Kv Value	4	7	12	19	30	47	77	120	193	288	410	725	1145

Maximum Allowable Pressure Differential for Throttling

Size Range	Max Pressure Differential (bar)
DN15-DN80	2.0
DN100-DN125	1.5
DN150	1.0
DN200-DN250	0.8

Note: When BSAT is used for throttling, exceeding the above pressure differential will increase noise and vibration

Material Specifications

No.	Component	BSA2 / BSA2T	BSA3 / BSA3T (DIN)	BSA3 / BSA3T (ANSI)
1	Body	Ductile Iron EN-GJS-400-18-LT	Cast Steel 1.0619 (GSC 25N)	Cast Steel ASTM A 216 WCB
2	Bonnet	Ductile Iron EN-GJS-400-18-LT	Steel (DN15-DN80) DIN 17243 C 22.8; Steel (DN100-DN200) 1.0619	Forged Steel (DN15-DN80) ASTM A 105; Cast Steel (DN100-DN200) ASTM A 216 WCB
3	Seat	Stainless Steel AISI 420	Stainless Steel AISI 420	Stainless Steel AISI 420
3-1	Metal Seat Disc	Stainless Steel DIN 17440 X30 Cr13	Stainless Steel DIN 17440 X30 Cr13	Stainless Steel DIN 17440 X30 Cr13
4	Soft Seat Disc	Stainless Steel DIN 17440 X30 Cr13	Stainless Steel DIN 17440 X30 Cr13	Stainless Steel DIN 17440 X30 Cr13
4-1	Soft Seat Insert	R-PTFE 25% Carbon Filled	R-PTFE 25% Carbon Filled	R-PTFE 25% Carbon Filled
5	Bellows	Stainless Steel DIN 17440 X6 Cr Ni Ti 1810	Stainless Steel DIN 17440 X6 Cr Ni Ti 1810	Stainless Steel DIN 17440 X6 Cr Ni Ti 1810
6	Stem	Stainless Steel AISI 420	Stainless Steel AISI 420	Stainless Steel AISI 420
7	Handwheel	Pressed Steel BS 1449 CR4	Pressed Steel BS 1449 CR4	Pressed Steel BS 1449 CR4
8	Stem Packing	Graphite	Graphite	Graphite
9	Bonnet Stud	Steel DIN 17420 24 Cr Mo 5	Steel DIN 17420 24 Cr Mo 5	Steel ASTM A 193 B7
9-1	Bonnet Nut	Steel DIN 17420 Ck 5	Steel DIN 17420 Ck 5	Steel ASTM A 192 2 H
10	Body/Bonnet Gasket	Stainless Steel Reinforced Laminated Graphite	Stainless Steel Reinforced Laminated Graphite	Stainless Steel Reinforced Laminated Graphite
11	Lock Nut	DN15-DN80: Steel M8×14mm BS 3692 Gr.8.8; DN100-DN150: Steel M8×20mm; DN200-DN250: Steel M12×20mm	DN15-DN80: Steel M8×14mm BS 3692 Gr.8.8; DN100-DN150: Steel M8×20mm; DN200-DN250: Steel M12×20mm	DN15-DN80: Steel M8×14mm BS 3692 Gr.8.8; DN100-DN150: Steel M8×20mm; DN200-DN250: Steel M12×20mm

Stroke Limiter Configuration (BSAT)

Size Range (DN)	Required Hex Bolt Specification
15-80	M8×50mm
100-150	M12×75mm
200-250	M12×100mm

Note: Stroke limiter requires customer-supplied standard bolts and nuts; handwheel nut has pre-threaded mounting hole

Balanced Disc Application Conditions

Size (DN)	Applicable Pressure Differential (bar)
125	>25
150	>17
200	>10
250 (BSA2 only)	>6

Body Design Conditions

BSA2, BSA2T

Design Parameter	PN16	JIS/KS 10K	PN25	JIS/KS 20K
Maximum Allowable Pressure (PMA)	16 bar g	16 bar g	25 bar g	25 bar g
Maximum Allowable Temperature (TMA)	350°C	350°C	350°C	350°C
Max Operating Pressure - Saturated Steam (PMO)	14.7 bar g	14.7 bar g	22.3 bar g	22.3 bar g
Max Operating Temperature (TMO) - Soft Seat	230°C	230°C	230°C	230°C
Max Operating Temperature (TMO) - Metal Seat	350°C	350°C	350°C	350°C
Minimum Operating Temperature	-10°C	-10°C	-10°C	-10°C
Design Max Cold Hydrostatic Test Pressure	24 bar g	24 bar g	38 bar g	38 bar g

BSA3, BSA3T

Design Parameter	ANSI 150	ANSI 300	JIS/KS 20K
Maximum Allowable Pressure (PMA)	19.6 bar g	51 bar g	34 bar g
Maximum Allowable Temperature (TMA)	425°C	425°C	425°C
Max Operating Pressure - Saturated Steam (PMO)	14 bar g	41.6 bar g	30.7 bar g
Max Operating Temperature (TMO) - Soft Seat	230°C	230°C	230°C
Max Operating Temperature (TMO) - Metal Seat	425°C	425°C	425°C
Minimum Operating Temperature	-29°C	-29°C	0°C
Design Max Cold Hydrostatic Test Pressure	31 bar g	77 bar g	50 bar g

Installation and Maintenance

Installation Tips

• Install according to the flow direction arrow on the valve body
• Position handwheel for convenient operation
• Refer to the Installation and Maintenance Guide (IM-P137-02) provided with the product for detailed installation steps

Product Disposal

• This product is recyclable and proper disposal will not cause ecological problems

Spare Parts List

Available Spare Parts (Supplied as Sets)

Spare Part Name	Included Component Numbers
Body/Bonnet Gasket and Stem Packing	10, 8 (2 sets)
Stem and Bellows Assembly (specify BSA/BSAT)	5, 6, 8, 10
Disc and Other Options (specify valve model)	4, 8, 10

Ordering Information

Ordering Examples

1. Spirax Sarco DN25 BSA2T Bellows Sealed Globe Valve, PN16 or PN25 flanged connection
2. Body/Bonnet Gasket and Stem Packing for Spirax Sarco DN15 BSA2T PN16 Bellows Sealed Globe Valve

Special Notes

• If EN 10204 3.1 certificate is required, specify at time of order
• If upstream/downstream pressure differential exceeds balanced disc application conditions, must select model with "BD" designation (e.g., BSA2-BD)
• Specify valve model and size when ordering spare parts