Yoshitake BFV-1S is a high performance butterfly valve featuring a stainless steel body and a PTFE seat. It utilizes a double-eccentric structure that provides excellent sealing and a long service life. The valve is designed for use with steam, air, water, oil, and other non-dangerous fluids, making it suitable for various industrial applications. Pneumatic actuator KA and electric actuator DA are mountable for sizes 50 to 150A.

Specifications

Item	Description
Model	BFV-1S
Nominal size	50-150A (Lever-operated), 200-300A (Gear-operated)
Application fluid	Steam, air, water, oil and other non-dangerous fluids
Max. pressure / temperature	According to the Pressure-Temperature rating
Body Material	Stainless steel
Disc Material	Stainless steel
Seat Material	PTFE
Connection	Wafer (JIS 10K, ASME Class 150 / ANSI 150lb, EN PN16)

Pressure-Temperature Rating

WARNING

Confirm that the indications on the nameplate correspond with the specifications of the ordered product. Do not use the product if they are different.

Dimensions (mm) and Weight (kg)

Nominal size	d	L	L1	H	H1	F	C (JIS 10K)	C (EN PN16)	C (ANSI 150)	Weight (kg)
50A	50	43	18	212	72	210	120	125	120.5	3.5
65A	59	49	22	227	80	210	140	145	139.5	4.5
80A	72	49	22	237	87	210	150	160	152.5	5
100A	96	54	23	252	102	210	175	180	190.5	7

Nominal size	d	L	L1	H	H1	F	J	K	W	C (JIS 10K)	C (EN PN16)	C (ANSI 150)	Weight (kg)
200A	190	64	27	306	167	210	53	57	260	290	295	298.5	24
250A	238	71	32	370	205	210	66	77	300	355	355	362	40
300A	282	81	36	407	245	210	66	77	300	400	410	432	55

Handle Installation

50-150A

Attach the Handle with its tip pointing at the "SHUT" position, and fix it with a flat head screw.

200-300A

Align the holes of the Handle and the shaft. Insert the pin and hit it with a hammer to fix them.

Installation Cautions

Installation Directions

• Install the valve so that the directions of the flow and the arrow shown on the product match.
• The valve can be installed both horizontally and vertically, but do not install upside down.

• Do not disassemble the product unless it is necessary. Disassembly may prevent the product from functioning properly.

Piping and Connections

• Use sheet gaskets when connecting the valve to pipes. Using other types of gasket may cause fluid leak.
• Connect the product firmly so that the fluid will not leak. If connection is not firm, fluid might leak by vibration. Hot fluid may cause burn. Tighten the bolts uniformly in diagonal order.
• Connect the product so that it is not subject to excessive load, bending and vibration, which may seriously shorten the lifetime of the product.
• If freezing is possible, take antifreeze measures such as draining or insulation.

Improper Locations

• Do not install the product on the suction side of the pump. Such installation will damage the product.
• Avoid installing the product at a location where the flow is uneven, such as near the discharge outlet of the pump, outlet of an elbow, downstream side of a reducer and outlet side of a control valve. If such installation is unavoidable, spare a distance about 5 times of the nominal size and install the valve with a posture in which the disc does not rotate by uneven flow.
• Uneven force applied on the valve disc may damage the product.

Operation

Warning

• Before letting the fluid into the product, be sure that there will be no possibility of danger if fluid flows into the ends of piping, and that the product is firmly connected. High temperature fluids may cause burn injury.
• When using with a high temperature fluid, do not touch the product with your bare hands.

Caution

• When applying the fluid into the valve, operate the valve slowly to prevent water hammer and condensate problem. Valves, fitting or other equipment may be damaged by water hammer or condensate problem if the valve is opened rapidly.

Maintenance and Inspection

Warning

When disassembling and inspecting the product, ensure that pressure in the valve and pipe is atmospheric pressure. If using with high temperature fluids, cool the product down well until it can be touched with bare hands. Disassembly and inspection should be conducted by properly trained personnel.

Conduct periodic inspection once a year to maintain functions and performance of the product.

Inspection items
Whether opening and closing operation is normal
Whether there is abnormal noise
Whether there is external leak

Troubleshooting

Trouble	Cause	Remedy
External leak from the gland part	Nut is loose.	Tighten nut. If the leak does not stop, replace the product.
Seat leakage	Seat is damaged.	Replace the product.
	Disc is damaged.	Replace the product.
	Foreign substances are stuck.	Remove the foreign substances.
Abnormally high operation torque	Nut is overtightened.	Loosen nut and re-tighten so that there is no leak (but not too tightly).
	Seat is damaged.	Replace the product.
	Foreign substances are stuck.	Remove the foreign substances.
Abnormal noise	Nut is loose.	Tighten nut.