Product Overview

Spirax Sarco BSA6T series is a full stainless steel bellows sealed globe valve featuring double bellows seal design, suitable for steam, gas, liquid, condensate and water systems. Equipped with throttling disc and stem locking device, PN40 pressure rating, size range DN15-DN100. Products comply with European Pressure Equipment Directive 97/23/EC, and EN 10204 3.1 certificates are available upon request at time of order.

Product Specifications

Material	Model	Connection Type	Size Range (DN)	Options
Stainless Steel	BSA6T	PN40	15, 20, 25, 32, 40, 50, 65, 80, 100	R-PTFE Soft Seat

Dimensions/Weight (Approximate)

Size	A(PN)	B	C	Weight (kg)
DN15	130	205	125	4
DN20	150	205	125	5
DN25	160	217	125	6
DN32	180	217	125	8
DN40	200	243	200	11
DN50	230	243	200	14
DN65	290	263	200	19
DN80	310	287	200	26
DN100	350	383	315	44

Sealing Class and Kv Values

Sealing Class

• Disc/seat sealing complies with EN 12266-1 Class A and ISO 5208 Class A

Basic Kv Values

Size (DN)	15	20	25	32	40	50	65	80	100
Kv Value	4	7	12	19	30	47	77	120	193

Maximum Allowable Pressure Differential for Throttling

Size Range	Max Pressure Differential (bar)
DN15-DN80	2.0
DN100	1.5

Note: When BSA6T is used for throttling, exceeding the above pressure differential will increase noise and vibration

Material Specifications

No.	Component	Material Specification
1	Body	Stainless Steel EN 10213 1.4408 or ASTM A351 CF8M
2	Bonnet	Stainless Steel EN 10213 1.4581
3	Seat	Stainless Steel EN 10213 1.4408 or ASTM A351 CF8M
4	Disc	DN15-DN40: Stainless Steel EN 10088 1.4571; DN50-DN100: Stainless Steel EN 100222 1.4571
5	Bellows	Stainless Steel DIN 17440 1.4571
6	Stem	Stainless Steel EN 10088 1.4571
7	Handwheel	Pressed Steel BS 1449 CR4
8	Stem Packing	Graphite
9	Bonnet Stud	Stainless Steel A4-70
9-1	Bonnet Nut	Stainless Steel A4
10	Body/Bonnet Gasket	Stainless Steel Reinforced Laminated Graphite
11	Lock Nut	DN15-DN80: Steel M8×14mm A2-70; DN100: Steel M8×20mm

Stroke Limiter Configuration

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

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

Body Design Conditions

Design Parameter	Specification
Maximum Allowable Pressure (PMA)	40 bar g (at 50°C)
Maximum Allowable Temperature (TMA)	400°C (at 25 bar g)
Minimum Allowable Temperature	-10°C
Max Operating Pressure - Saturated Steam (PMO) - Metal Seat	29.8 bar g (236°C)
Max Operating Pressure - Saturated Steam (PMO) - Soft Seat	27.0 bar g (230°C)
Max Operating Temperature (TMO) - Metal Seat	400°C (25.6 bar g)
Max Operating Temperature (TMO) - Soft Seat	230°C (27.0 bar g)
Design Max Cold Hydrostatic Test Pressure	60 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	5, 6, 8, 10
Disc and Other Options	4, 8, 10

Ordering Information

Ordering Examples

1. Spirax Sarco DN25 BSA6T Stainless Steel Bellows Sealed Globe Valve, PN40 flanged connection
2. Body/Bonnet Gasket and Stem Packing for Spirax Sarco DN15 BSA6T PN40 Bellows Sealed Globe Valve

Special Notes

• If EN 10204 3.1 certificate is required, specify at time of order
• Specify valve model and size when ordering spare parts