Katsura Company, Ltd.

Earthquake Actuated Automatic Gas Shutoff System (Gura-Pita)

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Earthquake Actuated Automatic Gas Shutoff System (Gura-Pita)

G-250 · G-400

		G-250	G-400
Compatible Shutoff Valve		MV – 25, MV – 25F, MV – 40F, HV – 25F
Basic Configuration and Functions	Operations Method	Vertical magneto (Mechanical)
	Method of Mounting	Ground fixing (With outer case)
	Connection of Release	M12 x 1 Female screwed
	Indication	Green: Normal, Red: Sensed an earthquake
	Reset Method	By turning the handle
	Output	Horizontal push: 1 kg; Output length: 4 mm or mo
	Dimensions	Body：129(W) × 143(H) × 95(D） Case ：183（W）× 381(H) × 133（D）

Sensor	Sensitivity	200 – 250 GAL （Equivalent to magnitude 5）	320 – 400 GAL （Equivalent to magnitude 6）
	Working Test	Manual by turning the handle
	Accuracy Checking	cInclination angle
Main materials	Body	ASA Plastic
	sensor	Rare-earth metal
	Sensor Holder	BSBM
	Hanging Plate	–
	Outer Case	SPCC SS330
Remarks	Weather Resistance	Simplified drip-proof structure
	Working Temperature	– 10 – 40 ℃
	Working Humidity	90% RH or less
Price		–	–

	Drawings	CAD	Maunal	Product picture
G-250	○		◯	○
G-400	○		◯	○

Shutoff Valve Specialized for Earthquake

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Shutoff Valve Specialized for Earthquake


MV‐Type (Medium Pressure)	HV‐Type (High Pressure)

		MV-15	MV-20FR MV-20FL	MV-25	MV-25FR MV-25FL	MV-40F	HV-25F
Compatible Earthquake Sensor		G-250　 G-400
Basic Configuration and Functions	Operations Method	Magnetic lever (Mechanical）
	Connections	Rc½(Female screwed)	JIS 20 K 25 A Flanged	Rc１(Female screwed)	JIS 20 K 25 A Flanged	JIS 20 K 40 A Flanged	JIS 20 K 25 A Flanged
	Flow Rate	30 kg/h	70 kg/h	70 kg/h	100 kg/h	200 kg/h	100 kg/h
	Face to Face Dimension	90 mm	208 mm	90 mm	170 mm	200 mm	170 mm
	Connection of Release	M12×1　Female screwed
	Indication	Colorless: Opened, Red: Closed
		Normal open （Contact Capacity : DC30 V　3 A）
	Reset Methods	By pulling up the handle after resetting earthquake sensor
	Max. Working Pressure	0.2 MPa					1.56 MPa
	Input	Horizontal push: 300 g Input length: 3 mm or more
	Working Test	Manual by operating the sensor
Main Materials	Body	Ductile cast iron (Spheroidal graphite cast Iron)
	Housing	Aluminum alloy die casting
Notes	Weather Resistance	Simplified drip-proof structure
	Working Temperature	-10 – 40℃
	Working Humidity	90％ RH or less

	Drawings	CAD	Performance curve	Maunal	Product picture
MV-15	○			○
MV-20FR	○			○
MV-20FL	○			○
MV-25	○			○	○
MV-25FR	○			○
MV-25FL	○			○
MV-40F	○			○	○
HV-25F	◯			○	○

Release

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Release

Model No.	REL-10	REL-18
Length	1,000 mm	1,800 mm
Connections	M12 × 1	Male screwed
Installation Methods	Linear distance between trembler breaker and release connector 1,300 mm or less for G-250 and G-400
Price	–

Note 1: When bending the release, make sure the radius of curve is 150 mm or more.
Note 2: Sold separately.

	Drawings	CAD	Performance curve	Maunal	Product picture
REL-10	○			○	○
REL-18	○			○

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Operating principle of Gurapita

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Operating principle of Gurapita


	●When Shutoff Valve is Open (Standby State) When the valve is open, the adsorption board has been adsorbed to the permanent magnet in the shutoff valve. The shutoff valve keeps its opened condition by an inside permanent magnet and secure the detector by magnet inside sensor. ●When Earthquakes Occurs When earthquake sensor senses over a level 5 earthquake, the sensor separates from the magnet and push down the pointed end of the release. (The release is put a cable through a flexible pipe and fitted with hard axis of the metal at both ends of the pipe. When one end of the metal is pressed, the other end is pushed down and comes out the cable under stress of physical force.) With pressing the end of the release of sensor side, the end of the release of shutoff valve side comes out, and press the lever inside of the shutoff valve. Expanding the force from the release and pull the adsorption board away from the permanent magnet, the lever close the valve by force of the actuating spring.

Earthquake Actuated Automatic Gas Shutoff System (Gura-Pita) Example of Installation

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Example of Installation (Note: Bypass piping is recommended for maintenance.)

●High-Pressure Bypass Method●

●Low-Pressure W Method●

●Bulk Supply System●

Note: When earthquake sensor senses over the setting level (3 types; see the specifications), sensor activates a shutoff valve automatically by force of pushing down the operating shaft through the release.

●30-Unit Manifold●
30本立て集合装置

●Bulk Supply●
バルク供給設備