The Yoshitake BSV-20F and BSV-10F are ductile cast iron bellows seal globe valves designed to provide superior isolation for steam, air, cold and hot water, oil, and other non-dangerous fluids. Engineered with a highly durable SUS316Ti stainless steel bellows and stainless steel valve internals (reinforced with Stellite), these valves completely eliminate gland leakage and the need for frequent maintenance. The BSV-10F features JIS 10K FF flanged connections for up to 1.4 MPa, while the heavy-duty BSV-20F utilizes JIS 20K RF flanges to handle pressures up to 2.8 MPa and temperatures up to 350°C. Both models ensure safe and highly reliable performance in demanding industrial piping systems.

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
Max. Pressure	1.4 MPa *1	2.8 MPa *1 (15A-100A) 2.0 MPa *1 (125A-150A)
Max. Temperature	300°C *1	350°C *1
Body Material	Ductile cast iron	Ductile cast iron
Bonnet Material	Ductile cast iron	Ductile cast iron
Valve Material	Stainless steel	Stainless steel
Seat Material	Stainless steel	Stainless steel
Bellows Material	Stainless steel (SUS316Ti)	Stainless steel (SUS316Ti)
Connection	JIS 10K FF flanged	JIS 20K RF flanged

1: The relationship between the operating pressure and operating temperature is based on JIS B2051 pressure-temperature standard.Note: Valve is closed at the time of shipment from the factory.

Dimensions and Weights

BSV-10F Dimensions

Nominal Size	d	H	D1	L	Weight (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
100A	100	348	250	292	30.0
125A	125	358.5	300	356	48.0
150A	150	440.5	400	406	67.0
200A	200	570.5	450	495	115.0

BSV-20F Dimensions

Nominal Size	d	H	D1	L	Weight (kg)
15A	15	184	125	110	4.0
20A	20	184	125	120	4.5
25A	25	188.5	125	130	5.5
32A	32	193	125	160	7.5
40A	40	235.5	180	180	10.5
50A	50	235.5	180	230	12.5
65A	65	252.5	200	292	17.5
80A	80	272.5	200	318	22.0
100A	100	348	250	356	36.5
125A	125	380	300	400	51.0
150A	150	427	400	444	68.0

Structure and Materials

No.	Name of Parts	Material
1	Body	Ductile Cast Iron (FCD450)
2	Bonnet	Ductile Cast Iron (FCD450)
3	Valve	Stainless Steel + Stellite
4	Valve Seat	Stainless Steel + Stellite
5	Spindle	Stainless Steel (SUS304 equivalent)
6	Bellows	Stainless Steel (SUS316Ti equivalent)
7	Top Plate	Stainless Steel (SUS304 equivalent)
8	Bottom Plate	Stainless Steel (SUS304 equivalent)
9	Gasket	Expanded Graphite
10	Gland Nut	Stainless Steel (SUS304 equivalent)
11	Gland Washer	Stainless Steel (SUS304 equivalent)
12	Gland Packing	Expanded Graphite
13	Sleeve	Steel
14	Stopper	Steel
15	Handle	Ductile Cast Iron (FCD450)
16	Handle Nut	Steel
17	Sleeve Washer	Stainless Steel (SUS304 equivalent)
18	Pin	Stainless Steel
19	Pin	Stainless Steel
20	Bolt	Steel
21	Lock Bolt	Steel
22	Name Plate	Aluminium

Storage and Installation

Caution

• 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.
• To install the product, make sure that the direction of fluid flow matches the arrow marked on the product.
• In order to avoid excessive piping stress in the valve, carefully align the center of the valve and the connected pipe so that they will be in line.
• In case that the product is expected to be frozen, be sure to conduct freezing prevention measures or water draining treatment.
• The valve can be installed in both horizontal and vertical pipes, but the position must be 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. For additional tightening, ensure that the valve is open, and tighten the bolts in a diagonal sequence from a low torque to the tightening torque as listed in the table below using a torque wrench. Tightening should be done gradually and evenly.

Additional Tightening Torque:

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

Operation

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.

Caution

• 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.
• Operate the valve according to the torque limits shown below, and do not apply excessive force.

Operation Torque Limits:

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

Tighten the lock bolt if it is necessary to fix the handle. 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 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	1. The valve and/or valve seat are damaged. 2. Foreign matter caught.	1. Replace the product with a new one. 2. Remove the foreign substance.
Operation torque of the handle is abnormally large	1. Poor lubrication of the sleeve. 2. Foreign substance is stuck on spindle and screw part.	1. Apply grease to the sleeve. 2. Remove the foreign substance.
Abnormal sound	Each screw is loose.	Retighten the loosened parts.

Maintenance

Warning

Completely discharge the pressure inside of the product, line and equipment before inspection and maintenance. For high temperature fluid, cool down the product till it can be touched with bare hands. Failure to follow this notice may result in injury or burns due to residual pressure.

Please perform annual inspections to maintain the product's optimal performance. Check for normal switching operation, abnormal sounds, and any signs of external leakage.