There's a flapper valve used as a NRV for water, not the spring loaded brass ones. 

What do you call them.

 

With a flap?

The ones I have/know are also made of brass.

The usual English word seems to be "check valve"?

"swing check valve" seems to be the word.

 

check valve with spring:

 

 

Walve 

 

Flapper?

Sounds like some sort of check valve. Allows only flow in one direction.

In line valves as shown are referred to as either a check valve or non return valve and allow flow only in one direction as per the directional arrow on the valve body, which dictates installation orientation.

I need to replace my Spring Check Valve with a Swing Check Valve because the spring one is restricting my water flow. I think.

Thanks for the replies. ????

1 hour ago, carlyai said:

I need to replace my Spring Check Valve with a Swing Check Valve because the spring one is restricting my water flow. I think.

Thanks for the replies. ????

I think you need a " Butterfly Valve " - the correct name for this type of Valve not a swing valve

1 hour ago, carlyai said:

I need to replace my Spring Check Valve with a Swing Check Valve because the spring one is restricting my water flow. I think.

Thanks for the replies. ????

I have a spring non-return valve also fitted directly after the meter, doesn't seem to affect my water flow, I prefer them to a flap valve as I have experienced in past that sometimes flap valves (as I like to call them) do not close sufficiently if water pressure is low, relying only on a weight & pressure, if the town water is off, I don't want to supply the town with my tank reserve.

22 hours ago, KhunBENQ said:

 

Check 

It's  called check valve. I replaced mine with 1 inch valve on the 3/4 inch pipe with fittings.

I recommend you to do same thing if you worry about low water flow.

 

13 hours ago, Jaxxper said:

Sounds like some sort of check valve. Allows only flow in one direction.

for awhile anyway. 

11 hours ago, carlyai said:

I need to replace my Spring Check Valve with a Swing Check Valve because the spring one is restricting my water flow. I think.

Thanks for the replies. ????

i'd put a lighter spring in it

10 hours ago, Cake Monster said:

I think you need a " Butterfly Valve " - the correct name for this type of Valve not a swing valve

Absolutely not.

A post in which the quoted content had been altered has been removed. 

On 4/19/2021 at 12:52 PM, brianthainess said:

I have a spring non-return valve also fitted directly after the meter, doesn't seem to affect my water flow, I prefer them to a flap valve as I have experienced in past that sometimes flap valves (as I like to call them) do not close sufficiently if water pressure is low, relying only on a weight & pressure, if the town water is off, I don't want to supply the town with my tank reserve.

Yes the spring check valve is probably the best for your setup, but my low pressure aquaponics system(45w pump) probably needs a Swing valve. I have a spring valve and replacing it. I just wanted to know the correct name which differentiates it from those springy thinggys.