Non-Water Hammer Check Valve


Non-Water Hammer Check Valve
SL series
(PAT.)

No valve closure delay means no water hammer and no noise

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No-Feed Detector

For the safest automatic pumping, the No-Feed Detector is recommended.

The YOKOTA No-Feed Detector is a safety device to prevent the pump from dry operation. Reacting to the movement of the check valve, the switch cuts off power automatically when the amount of flow is close to zero. If your pump is equipped with the Non-Water Hammer Check Valve with the No-Feed Detector, there is no need to worry about the occurrence of water hammer even if a high pressure tank is installed near the pump. Your automatic pumping system will operate safely and reliably.




NP model

Non-Water Hammer Check Valve / No-Feed Detector




BP model

Non-Water Hammer Check Valve / No-Feed Detector

NP model (For SL-SN, SH)

Non-Water Hammer Check Valve / No-Feed Detector


Part name
Part name
41-1

Proximity switch

31-1

O-ring

41-2

Proximity member

31-2

O-ring

41-3

Case

1

Valve case

41-4

Support ring

13

Valve arm pin

41-5

Cap

19

Pin holder

41-6

Set screw

30-1

O-ring


Use a flow speed of 0.38m/sec as a guideline for minimum flow rate setting.
However, use 120L/min as a minimum value for SNP-50, and 180L/min as a minimum value for SNP-65, 80.

When not operating for long periods of time during winter, remove the cap (41-5) and drain the water in the cap (or take measures to prevent the No-Feed Detector from freezing.)


BP model (For SL-NB)

Non-Water Hammer Check Valve / No-Feed Detector


Part name
Part name
41-1

Case

41-80

Proximity switch

41-2

Cover

41-90

Set screw

41-3

Adjusting nut

41-10

Stopper

41-4

Coil spring retainer

41-11

Retainer

41-5

Proximity tip

31-20

O-ring

41-6

Cap

31-30

O-ring

41-7

Coil spring

2

Top cover


Use a flow speed of 0.38m/sec as a guideline for minimum flow rate setting.
However, use 100L/min as a minimum value for NBP-40.



Contact protector relay

The contact protector relay protects small capacity contacts of the proximity switch. Please install the contact protector relay, using the specifications below, in the control panel for the YOKOTA No-Feed Detector.


Power supply

AC 100V, 200V

Control capacity

AC 7A-250V

DC 3A-30V

Connection and operation

,

Feed condition
No-feed condition
Proximity switch
ON
OFF
Contact protector relay
a contact
b contact
a contact
b contact
ON
OFF
OFF
ON

Outline drawing

Non-Water Hammer Check / Valve No-Feed Detector

Wiring diagram

Non-Water Hammer Check Valve / No-Feed Detector

If voltage is applied to an incorrect connection (parts T, H, and S), the proximity switch will be damaged.


Specifications stated here may be subject to change without notice due to product improvement.

Features
Structure
Technical data
Selection & Dimensions
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