The Yoshitake 150F-F is a flanged flap-type sight glass designed to permit visual checking of fluid flow inside a pipe. It is widely used for equipment protection or process control in manufacturing facilities. Featuring a ductile cast iron body and hardened glass, it is suitable for cold and hot water, oil, and other non-dangerous fluids up to 1.0 MPa and 150°C.

Features

• Variation in flow rate can be checked easily with the flap and scale plates.
• Pressure loss caused by the fluid flow is as low as 0.01 MPa even when the flap shows the maximum flow rate, and does not affect the pressure of the fluid.
• Can be connected to horizontal or vertical piping.
• The glass parts are consumable materials.

WARNING

When a flap type is applied to steam condensate, use the product with mica plates (model number: 150FM) within a max working pressure of 0.6 MPa. Do not use a flap type of 65-150A (such as the 150F-F) for steam condensate applications.

Specifications

Model	150F-F
Application	Cold and hot water, Oil, Other non-dangerous fluids
Nominal size	65A-150A
Maximum working pressure	1.0 MPa
Max. temperature	150°C
Max. thermal shock	100°C
Body Material	Ductile cast iron
Glass Material	Hardened glass
Flap Material	Stainless steel
Connection	JIS 10K FF flanged

Dimensions and Weights

Nominal size	d	L (mm)	W (mm)	Weight (kg)
65A	65	235	97	15.1
80A	73	235	97	15.5
100A	100	277	130	27.0
125A	125	336	155	37.3
150A	140	380	165	62.0

Flow Rate Characteristics Chart

(For Water, Horizontal Piping)

INFO

The flow characteristics shown in the chart are just for reference and cannot be used for actual measurement.

Installation and Operation

Precaution for installation

WARNING

1. Before connecting the product to piping, confirm that the product specifications are sufficient for the service condition. Failure to follow this notice may prevent the product from functioning properly.
2. Before connecting the product to piping, remove foreign substances and dirt inside the piping. Failure to follow this notice may make the glass damaged due to scratches by foreign substances or may make the fluid cannot be seen through the glass due to glass opacity caused by scale/oil stains.
3. When installing, check the direction of the product so that the fluid flowing and the arrow marked on the product are in the same direction. Setting the product in wrong directions prevents the product from functioning properly.
4. Do not apply excessive load, torque or vibration to the product. Failure to follow this notice may result in leakage.

Precaution for operation

DANGER

1. Do not apply a rapid temperature change to the product during both initial and usual operations. A rapid temperature change may damage the glass resulting in a blowout of the fluid.
2. When the product is used for hot fluid, do not touch the product with bare hands. The product having hot fluid may scald your skin.
3. Do not retighten the cover of the product. Failure to follow this notice may damage the glass resulting in fluid blowout.

TIP

The glasses are consumable parts. Replace the glass if it is eroded by more than 10% of its thickness, if it has scratches or flaws, or if it becomes opaque after contacting a certain type of fluid.

Troubleshooting

Trouble	Cause	Remedy
Flap does not move	1. The flap is caught by foreign substances sticking to the inner surface of the glass. 2. The flap is caught by scratches on the inner surface of the glass. 3. Flow rate does not reach the min. limit. 4. Fluid does not flow. 5. The product is installed in the opposite direction of the fluid flow.	1. Disassemble and clean the product to remove the foreign substances. 2. Disassemble the product and replace the damaged parts. 3. Replace the product with the one of a nominal size that ensures a flow rate of the min. limit. 4. Check the piping. 5. Reinstall the product correctly. (Match the arrow mark on the body with the flow direction.)
Fluid flow cannot be observed	1. Foreign substances stick to the inner surface of the glass, or the glass is stained. 2. The inner surface of the glass has erosion or scratches.	1. Disassemble and clean the product to remove the foreign substances. 2. Disassemble the product and replace the glass.
Outside leakage	1. The gasket leaks. 2. The glass is damaged.	1. Disassemble the product and replace the gasket. 2. Disassemble the product and replace the glass.

Disassembly and Reassembly

Disassembly

WARNING

Completely discharge the pressure inside of the product, piping and equipment prior to disassembly and inspection. When fluid is hot, cool down the product to the condition that it can be touched with bare hands.

1. Completely discharge the pressure inside of the product.
2. Remove the bolts and nuts.
3. Take out the covers and glasses.
4. If the glass sticks to the body and hardly comes off, put the cover on the glass in a way that the outer circumference of the glass fits the inner circumference of the cover, and then tap the cover on its outer side.

Reassembly

TIP

Clean the gasket spaces of the body, covers and glasses. The glasses and gaskets are consumable parts. Replace them with new ones at the time of reassembly of the product.

1. Attach the scale plates, glasses, and gaskets in this order to the covers and assemble them to the body. Attach the scale plates in positions where they can be read from outside of the product. In addition, make the flap point at the minimum scale value.

2. To fix the covers to the body, firstly tighten them temporarily with bolts and nuts, and then tighten them evenly at the torque specified in the table below by using a torque wrench. Overtightening damages the glass.

Tightening torque

Nominal size	Tightening torque
65A-125A	29.4 N·m
150A	68.6 N·m

Exploded Drawing