The Yoshitake FS-IV is a flap-type flow sight designed for monitoring the direction of fluid under forward or reverse flow conditions in the piping. The flapper inside the flow sight swings to the left and right symmetrically, with the middle set to 0. Additionally, the opening of the flapper changes according to the flow rate, providing a clear visual indication of flow conditions.

Features

• Monitors flow direction for both forward and reverse flows.
• Flapper swings symmetrically from a 0 center point.
• Flapper opening varies with the flow rate.
• Optional scale description is available.

Specifications

Specification	Details (Ductile cast iron)	Details (Stainless steel)
Application	Cold and hot water, Oil	Cold and hot water, Oil
Maximum working pressure	0.7 MPa	0.7 MPa
Max. temperature	60°C	80°C
Material (Body)	Ductile cast iron	Stainless steel
Material (Glass)	Hardened glass	Hardened glass
Material (Flap)	Brass	Stainless steel
Nominal size	8-50A	10-40A
Connection	JIS Rc screwed	JIS Rc screwed

INFO

Available with the Scale description for option.

Dimensions (mm) and Weights (kg)

Nominal size	S	P	H	L	Weight
8A	40	71	72	100	0.9
10A	40	71	72	100	0.9
15A	40	71	72	100	1.0
20A	46	78	90	110	1.4
25A	52	84	92	120	1.8
32A	70	110	130	150	4.0
40A	70	110	130	150	4.0
50A	70	110	140	160	7.5