Toilet cistern side entry ball valve doesn't shut off

[alfabet]

Hi,

I noticed yesterday that our toilet's ball valve never completely switches off. It drips into the cistern, until the water level eventually hits the external overflow.

It's one of these:

http://www.diy.com/nav/fix/plumbing...ry-Cistern-Ball-Valve-11477974?skuId=11988681

There's a fair bit of limescale and crud around the valve, so I was thinking of just replacing it.

Then I saw this, an alternative design:

http://www.diy.com/nav/fix/plumbing...lve-747UK074-Blue-White-9270902?skuId=9280602

From people's experience, are these a better design? Not having an arm and ball certainly sounds better to me.

Or is there another more durable option?

Many thanks!

 

[petertheplumber12]

Turn off the water to the ball valve, remove the large knurled nut, inside there is a diaphragm washer, replace it with a new one for about £.50 and jobs done, easy to repair old style, not so easy to repair fluid master. Buy a new washer first.

 

[Burnerman]

Fluidmaster gear is up there with the best, but with this one there sometimes isn't the space to get it physically in......if this is likely, the Torbeck side entry is a good alternative.
John