Yoshitake 150L-13S is a plain type sight glass in cast stainless steel (SCS13), designed to permit visual checking of fluid flow inside a pipe. It features a JIS Rc screwed connection and hardened glass, making it suitable for cold and hot water, oil, and other non-dangerous fluids. This model supports a maximum working pressure of 1.0 MPa and temperatures up to 150℃.

Features

• Two component fluid can be checked by its color or mixed state.
• Intermittent fluid flow can be checked.
• Can be connected to either horizontal or vertical piping.
• Available with mica plate for steam condensate (maximum allowable working pressure is 0.6 MPa).
• Body material is cast stainless steel for wider applications.

Specifications

Specification	Value
Model	150L-13S
Type	Plain
Application	Cold and hot water, Oil, Other non-dangerous fluids
Nominal size	15A–50A
Maximum working pressure	1.0 MPa
Temperature range	5–150℃ (Max. temperature: 150℃)
Max. thermal shock	100℃
Connection	JIS Rc screwed
Body Material	Cast stainless steel (SCS13)
Glass Material	Hardened glass

WARNING

When applied to steam condensate, use the product with mica plates (model number: 150LM), within max. working pressure of 0.6 MPa and max. temperature of 150℃.

Dimensions and Weights

Size	d	L	A	B	W	Weight (kg)
15A	Rc 1/2	76	73.5	51	35	0.73
20A	Rc 3/4	89	73.5	51	35	0.82
25A	Rc 1	114	89.0	67	44	1.5
32A	Rc 1-1/4	127	114.0	80	53	2.3
40A	Rc 1-1/2	140	115.5	86	57	2.9
50A	Rc 2	162	147.0	114	73	5.8

(Note: The products with protective wire mesh have dimensions A and weights different from the above.)

Parts List

No.	Name of Parts	Material	Q.TY
1	Body	Cast Stainless Steel (SCS13)	1
2	Cover	Cast Stainless Steel (SCS13)	2
3	Glass	Tempered Glasses	2
4	Gasket	Non-Asbestos	2
6	Bolt	Stainless Steel (SUS)	4
7	Nut	Stainless Steel (SUS)	4
8	Gasket	Non-Asbestos	2

Installation and Operation

Precaution for Installation

• Before connecting the product to piping, confirm that the product specifications are sufficient for the service condition.
• Before connecting the product to piping, remove foreign substances and dirt inside the piping. Failure to do so may damage the glass or cause opacity due to scale/oil stains.
• Check the direction of the product so that the fluid flowing and the arrow marked on the product are in the same direction.
• For steam condensate application, make sure to use the product with mica plates to protect the glasses.
• Do not apply excessive load, torque, or vibration to the product.
• Do not excessively screw in the product to the piping.

Precaution for Operation

DANGER

• 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.
• When the product is used for hot fluid, do not touch the product with bare hands.

TIP

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

Troubleshooting

Trouble	Cause	Remedy
Fluid flow cannot be observed.	1. Foreign substances stick to the inner surface of the glass, or the inner surface of the glass has erosion or scratches.	Disassemble and clean the product to remove foreign substances, or replace the glass.
Outside leakage	1. The gasket leaks. 2. The glass is damaged.	Disassemble the product and replace the gasket or glass.

Disassembly and Reassembly

Disassembly (150L, 150LM)

1. 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.
2. Remove the bolts and nuts.
3. Take out the covers and glasses. 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 (150L)

1. Clean the gasket spaces of the body, covers, and glasses.
2. Attach the gaskets, glasses, and gaskets in this order to the covers and assemble them to the body.
3. To fix the covers to the body, firstly tighten them temporarily with bolts and nuts, and then tighten them evenly at the specified torque by using a torque wrench.

Tightening Torque:

• 15A, 20A: 7 N·m
• 25A, 32A: 10 N·m
• 40A: 15 N·m
• 50A: 25 N·m

(For 150LM, attach the gaskets, glasses, mica plates, and gaskets in this order to the covers.)