Yoshitake BSV-10F is a ductile cast iron bellows valve designed for steam, air, cold and hot water, oil, and other non-dangerous fluids. It supports a maximum operating pressure of 1.4 MPa and a maximum operating temperature of 300°C. The valve features a stainless steel (SUS316Ti) bellows for reliable sealing and is equipped with a JIS 10K FF flanged connection.

Specifications

Model	BSV-10F	BSV-20F
Application	Steam, Air, cold and hot water, oil, other non-dangerous fluid	Steam, Air, cold and hot water, oil, other non-dangerous fluid
Maximum pressure	1.4 MPa *1	2.8 MPa *1
Maximum temperature	300°C *1	350°C *1
Body Material	Ductile cast iron	Ductile cast iron
Valve Material	Stainless steel	Stainless steel
Bellows Material	Stainless steel (SUS316Ti)	Stainless steel (SUS316Ti)
Connection	JIS 10K FF	JIS 20K RF

*1 The relationship between the operating pressure and operating temperature is based on JIS B2051 pressure-temperature standard.

Dimensions and Weights

Nominal Size	d	H	D1	L	Weights (kg)
15A	15	184	125	108	3.5
20A	20	184	125	117	4.0
25A	25	188.5	125	127	5.5
32A	32	193	125	140	6.5
40A	40	235.5	180	165	9.5
50A	50	235.5	180	203	11.5
65A	65	252.5	200	216	15.0
80A	80	272.5	200	241	18.5

Storage and Installation

Installation Cautions

• Store the product indoors in a dust free, low humidity, dry and ventilated environment.
• Installation should be conducted by suitably trained personnel, wearing protective head, eye, hand and foot protection.
• Make sure that the direction of fluid flow matches the arrow marked on the product.
• Align the center of the valve and the connected pipe so that they will be in line to avoid excessive piping stress.
• If freezing is expected, conduct freezing prevention measures or water draining treatment.
• The valve can be installed in both horizontal and vertical pipes, from upright to sideways. Do not install the valve upside down.

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 that the valve is open, and tighten the bolts in a diagonal sequence using a torque wrench.

Bolt 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

Safety Warning

Before applying fluid, make sure that there is no danger if the fluid flows into the end of the piping. Failure to follow this notice may result in property damage due to fluid leakage.

Operational Tips

• 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.

Handle Operation Torque Limits:

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

Sizes 200A and larger are equipped with Valve (S) to reduce the opening torque. When opening the valve, first rotate the Handle by approximately one full turn to open the Valve (S) and allow the differential pressure between the inlet and outlet pressures to reduce before continuing to operate the Handle.

When applying grease to the sleeve (recommendation: Henkel LOCTITE LB 8150), remove the lock bolt and put grease into the screw hole.

Troubleshooting

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