Yoshitake BSV-10S and BSV-10ST stainless steel bellows valves are designed to advance hydrogen and decarbonized society applications. They feature SUS316 and PTFE wetted parts, making them highly reliable for corrosive fluid applications and various fluids used in hydrogen production processes. The valves utilize a PTFE-based bonnet gasket specifically engineered for hydrogen leak prevention.

Valve Seat Options

The series provides two selectable valve seat options to meet different operational requirements:

• BSV-10S: Metal Seat
• BSV-10ST: Soft Seat (PTFE)

Key Features

1. Constant Handle Height Design: Non-rising stem design ensures the handle height remains constant during operation.
2. Built-in Handle Lock Function: Helps prevent misoperation.
3. Easy Valve Position Identification: Features "O" (Open) and "S" (Shut) indicators for at-a-glance status checks.
4. Double-Seal Design: Combines formed bellows and gland packing to prevent fluid leakage to the outside.
5. High-Strength Bellows: Features a double-layer construction made of titanium-stabilized stainless steel for high strength and a long service life.

Specifications

Model	BSV-10S	BSV-10ST
Applicable Fluids	Steam, air, water, oil, hydrogen *1	Steam, air, water, oil, hydrogen *1
Maximum Operating Pressure	1.4 MPa	1.4 MPa
Maximum Operating Temperature	300°C	183°C
Body Material	Stainless Steel (Eq. SCS14A)	Stainless Steel (Eq. SCS14A)
Bonnet Material	Stainless Steel (Eq. SCS14A)	Stainless Steel (Eq. SCS14A)
Spindle	SUS316	SUS316
Valve	SUS316	SUS316+PTFE
Bellows	Stainless Steel (Eq. SUS316Ti)	Stainless Steel (Eq. SUS316Ti)
Connection	JIS 10K RF	JIS 10K RF

Note

*1 For fluids not listed above or hydrogen applications, please contact the manufacturer regarding operating conditions. The relationship between the operating pressure and operating temperature is based on JIS B2051; for PTFE, the PTFE rating in JIS B2051 applies.

Dimensions (mm)

Size	15A	20A	25A	32A	40A	50A	65A	80A	100A
L	108	117	127	140	165	203	216	241	292
H	189	189.5	193	198.5	239	240	256	274.5	355
D	125	125	125	125	180	180	200	200	250

Installation and Operation

Installation Caution

• Store the product indoors in a dust-free, low humidity, dry and ventilated environment.
• To use the valve for high-temperature fluids (approximately 200°C or higher), raise the valve temperature to the operating temperature, and then tighten the bolts additionally. Ensure the valve is open, and tighten the bolts in a diagonal sequence using a torque wrench.

Nominal Size	15-20A	25-32A	40-50A	65A	80-100A
Bolt width across flats (mm)	17	17	19	19	24
Tightening torque (N·m)	20	30	40	50	70

Operation Guidelines

• When using the product with its valve fully open, turn the handle counterclockwise by 45 degrees from the fully open position to prevent the valve from being stuck.
• Do not try to turn the handle beyond its fully open/closed positions. Otherwise, the valve may be damaged.
• When applying grease to the sleeve, remove the lock bolt and put grease into the screw hole (recommendation: Henkel LOCTITE LB 8150).

Troubleshooting

Trouble	Cause	Remedy
Leakage from between body and bonnet	Stress relief of gasket.	Tighten the bolt additionally. If leakage does not stop, replace the product.
Leakage from the gland packing part	Damage of the bellows.	Tighten the gland nut. Then, replace the product immediately.
Leakage from valve/seat on complete closing	1. Valve/seat are damaged. 2. Foreign matter caught.	1. Replace the product with new one. 2. Remove the foreign substance.
Operation torque of handle is abnormally large	1. Poor lubrication of the sleeve. 2. Foreign substance stuck on spindle/screw.	1. Apply grease to the sleeve. 2. Remove the foreign substance.