Yoshitake MD-71 emergency shut-off system is designed to secure water for living in receiving tanks and high placement tanks in the event of an earthquake. Comprising the MD-71 emergency shut-off valve and the KS-5 control panel, the system automatically closes the valve when the integrated earthquake sensor detects a tremor of 200 Gal or higher. This prevents the loss of precious water due to damaged piping and secures vital resources following a disaster.

Features

• An earthquake sensor (acceleration: 200 Gal) is installed inside the control console that automatically works in case of an earthquake.
• The control console properly works with the backup power source (approx. 5 hours) even in case of a power failure.
• The pump instantly stops when the shut-off valves close (requires wiring between the interlock terminal of the control console and the pump).
• Resetting after a shut-off valve control is easy with a pushbutton switch.
• The control console can be manually operated in case of necessity.

MD-71 Specifications

Specification	MD-71	MD-71-N (JWWA)
Application	City water / Tap water	City water / Tap water
Applicable pressure	0 - 1.0 MPa	0 - 1.0 MPa
Applicable fluid temperature	5 - 60°C	5 - 60°C
Installation posture	Can be installed in any posture, from upright to sideways to horizontal piping	Can be installed in any posture
Opening-closing time	50A-65A: 3-4s, 80A-100A: 6-10s, 125A-150A: 12-17s, 200A: 36-50s	50A-65A: 3-4s, 80A-100A: 6-10s, 125A-150A: 12-17s, 200A: 36-50s
Actuator Rated voltage	24 V DC	24 V DC
Actuator Power consumption	50-100A: MAX. 80 VA, 125-200A: MAX. 120 VA	50-100A: MAX. 80 VA, 125-200A: MAX. 120 VA
Ambient temperature	-20 – 55°C (no freeze condition)	-20 – 55°C (no freeze condition)
Protective structure	Outdoor rainproof structure (JIS C0920 IP65)	Outdoor rainproof structure (JIS C0920 IP65)
Body Material	FCD 450	FCD 450
Valve Material	Stainless steel or Stainless steel cast	Stainless steel or Stainless steel cast
Seat Material	FKM	FKM
Connection	JIS 10K flanged	JIS 10K flanged

INFO

Please contact the manufacturer when using a fluid other than city water.

Dimensions and Weights

Nominal size	d (mm)	L (mm)	H (mm)	D (mm)	A (mm)	B (mm)	C (mm)	n-h	Weight (kg)
50A	52	41	332	115	175	160	120	4-19	7.7
65A	64	44	349	135	175	160	140	4-19	9.2
80A	78	44	356	145	175	160	150	8-19	9.7
100A	103	51	384	175	175	160	175	8-19	12
125A	129	54	406	206	175	160	210	8-23	15
150A	154	54	419	231	175	160	240	8-23	16
200A	205	64	501	290	217.5	175	290	12-23	30

Cv Values

Nominal Size	50A	65A	80A	100A	125A	150A	200A
Cv Value	159	266	457	860	1320	2020	3540

KS-5 Control Panel Specifications

Specification	KS-5
Number of valves controlled	2 (Available for 1, 3, or 4 units)
Supply power source	85-240 V AC, 50 / 60 Hz
Backup power source	24 V DC (Approx. 5 hours backup time)
Storage battery	PE 12 V 2.2 (Constant float charging)
Output terminals	24 V DC (control), No-voltage c-contact (pump protection), No-voltage a-contact (sensor/power warning)
Earthquake sensor detection	All horizontal directions
Set acceleration	200 Gal (intensity 5 upper)
Installation location	Indoor and outdoor (equal to JIS C 0920 IP44), Wall-hang type

Storage Battery Replacement

Replace the storage battery cells every three years. If they are not replaced, the unit can possibly fail in starting up in the case of a power failure.

Operation Flowchart