The Yoshitake BSV-10ST is a new stainless steel bellows valve designed to advance hydrogen applications and decarbonized society initiatives. It features SUS316 wetted parts and a PTFE-based bonnet gasket for optimal corrosion resistance and hydrogen leak prevention. The valve comes in two seat options: the BSV-10S with a metal seat (SUS316) for high temperatures up to 300°C, and the BSV-10ST with a soft seat (SUS316+PTFE) for applications up to 183°C.

Key Features

• Stainless Steel Wetted Parts: Constructed with SUS316 & PTFE to reliably handle corrosive fluid applications.
• PTFE Gasket: Uses a PTFE-based bonnet gasket effectively preventing hydrogen leakage.
• Double-Seal Design: The bellows features a double-layer construction made of titanium-stabilized stainless steel (equivalent to SUS316Ti), ensuring high strength, a long service life, and excellent leakage prevention.
• Built-in Handle Lock: Features a constant handle height design with a built-in handle lock function.
• Position Indication: Easy valve position identification with "O" (Open) and "S" (Shut) indicators.

Selectable Valve Seat Options

The BSV-10 series offers two seat options. Both are suitable for various fluids used in hydrogen production processes. (Contact Yoshitake regarding specific operating conditions.)

Metal Seat (BSV-10S)

Soft Seat (PTFE) (BSV-10ST)

Specifications

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

INFO

*1 For fluids not listed above, or for hydrogen applications, please contact the manufacturer.

Dimensions

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

Caution

• Store indoors in a dust-free, dry environment.
• Align the center of the valve and piping to avoid excessive stress.
• Keep the valve upright to sideways; do not install upside down.

Tightening for High-Temperature Fluids When used for high-temperature fluids (approx. 200°C or higher), raise the valve to the operating temperature, make sure the valve is open, and tighten the bolts in a diagonal sequence using a torque wrench. Tighten gradually from a low torque up to the specified tightening torque.

Nominal size	15-20A	25-32A	40-50A	65A	80-125A	150-250A
Bolt width across flats (mm)	17	17	19	19	24	24
Tightening torque (N·m)	20	30	40	50	70	100

Operation Limits When using the valve fully open, turn the handle counterclockwise by 45 degrees from the fully open position to prevent sticking. Do not turn the handle beyond fully open/closed positions.

Nominal size	15A	20A	25A	32A	40A	50A	65A	80A	100A	125A	150A	200A	250A
Torque limits (N·m)	20	20	25	30	50	50	80	110	160	245	300	300	300

Opening Procedure for Large Sizes (200A and up) Sizes 200A and larger are equipped with Valve (S) to reduce opening torque. First, rotate the handle approximately one full turn to open Valve (S) and reduce differential pressure before continuing.

Handle Lock and Grease Injection To fix the handle, tighten the lock bolt. When applying grease to the sleeve (Henkel LOCTITE LB 8150 recommended), remove the lock bolt and inject grease into the screw hole.

Troubleshooting

Trouble	Cause	Remedy
Leakage between body and bonnet	Stress relief of gasket.	Tighten the bolt additionally. If leakage persists, replace the product.
Leakage from gland packing	Damage of the bellows.	Tighten the gland nut. Then, replace the product immediately.
Leakage on complete closing	Valve/seat damaged or foreign matter caught.	Replace product or remove foreign substance.
Abnormally large operation torque	Poor lubrication or foreign substance on spindle.	Apply grease to sleeve or remove foreign substance.
Abnormal sound	Screws are loose.	Retighten loosened parts.