Ball valve seat

An improved ball valve seat including a ball valve seat body which includes a water intake connector, a ball valve seat, a limiting seat, and a water outlet seat, all of which are formed by forging. The water intake connector is provided with a through water intake hole having a first flared portion at a rear end thereof, an outer threaded portion, and a stop rim behind the outer threaded portion. The ball valve seat includes a ball valve chamber, an inner stepped hole at a rear end of the ball valve chamber, and a connecting opening with an inner threaded portion at a front end of the ball valve chamber. The limiting seat includes a through communication hole with a second flared portion at a front end thereof, and an inner threaded portion at a rear end thereof. The water outlet seat is centrally provided with a through hole having a third flared portion at a front end thereof, an outer threaded portion near the front end of the water outlet seat, and a stop rim behind the outer threaded portion. When the inner threaded portion of the ball valve seat engages the outer threaded portion of the connector head of the water intake connector, the connecting opening of the ball valve seat will urge against the stop rim of the water intake connector and be positioned.

BACKGROUND OF THE INVENTION 
(a) Field of the Invention 
The present invention relates generally to an improved ball valve seat, and 
more particularly to a ball valve seat the components of which are forged 
and all the joining surfaces are welded to avoid leakage and achieve an 
integral ball valve. 
(b) Description of the Prior Art 
Conventional ball valve seats are generally made of metal and are cast in 
shape. As casting of ball valve seats requires skill, labor is expensive 
and hard to find. 
Furthermore, cast ball valve seats may have pores in the walls and cannot 
be utilizable. If they are used, there will be serious leakage problems. 
SUMMARY OF THE INVENTION 
A primary object of the present invention is to provide an improved ball 
valve body, the components of which are formed by forging to reduce 
porosity, ensure good quality, and allow automation of machining.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
With reference to FIGS. 1, 1A, and 1B, the present invention comprises a 
ball valve seat body 10 which includes a water intake connector 2, a ball 
valve seat 3, a limiting seat 4, and a water outlet seat 5. All of the 
elements are forged in shape, processed and then assembled together. 
The water intake connector 2 is provided with a through water intake hole 
23 at the center thereof, a first flared portion 24 at a rear end of the 
water intake hole 23, an outer threaded portion 21 on a connector head 
thereof near the rear end of the water intake connector 2, and a stop rim 
22 behind the outer threaded portion 21. 
The ball valve seat 3 includes a ball valve chamber 33 at a center thereof, 
an inner stepped hole 32 disposed at a rear end of the ball valve chamber 
33 and communicating with the ball valve chamber 33, a connecting opening 
34 at a front end of the ball valve chamber 33, and an inner threaded 
portion 31 disposed at the connecting opening 34. 
The limiting seat 4 includes a through communication hole 41, a second 
flared portion 42 at a front end of the communication hole 41, and an 
inner threaded portion 43 at a rear end of the communication hole 41. 
The water outlet seat 5 is centrally provided with a through hole and 
includes a third flared portion 51 at a front end of the through hole, an 
outer threaded portion 52 near the front end of the water outlet seat 5, 
and a stop rim 53 behind the outer threaded portion 52. 
When the inner threaded portion 31 of the ball valve seat 3 engages the 
outer threaded portion 21 of the connector head of the water intake 
connector 2, the connecting opening 34 of the ball valve seat 3 will urge 
against the stop rim 22 of the water intake connector 2 and be positioned. 
When a ball valve 6 is insertably fitted into the ball valve chamber 33 
along with a washer 6P, it will abut the first flared portion 24 of the 
water intake connector 24 and be positioned. 
With further reference to FIGS. 2 and 2A, the outer threaded portion 52 of 
the water outlet seat 5 engages the inner threaded portion 43 of the 
limiting seat 4 such that the stop rim 53 urges against a face rim of the 
limiting seat 4, and a washer 6P attached to the third flared portion 51 
also urges against the ball valve 6. Welding W (or friction welding) is 
applied to the joining surfaces to ensure that there are no gaps. In 
addition, a fixing agent may be applied to where the threaded portions 
engage to achieve an integral ball valve seat body 10. Furthermore, the 
contact surfaces inside may achieve even and tight threaded engagement to 
avoid leakage. 
In summary, since all the components of the present invention are formed by 
forging, the present invention is able to effectively eliminate drawbacks 
with conventional cast components. Besides, forged components may allow 
excellent automation of machining processes to enhance production and 
facilitate quality control. 
Although the present invention has been illustrated and described with 
reference to the preferred embodiment thereof, it should be understood 
that it is in no way limited to the details of such embodiment but is 
capable of numerous modifications within the scope of the appended claims.