Ball Valve Parts (2)

August 6th 2022

Table of Contents


(1)Valve body construction type

(2)Ball valve body stypes

(3)Body end connections

2. Bonnet 

(1)Ball valve stem

(2)Ball valve stem

(3)Ball valve packing gland



(1) Peek Ball Valve Seat

(2) PTFE Ball Valve Seat


(1) Floating Ball

(2) Trunnion Mounted Ball


(1)Reduced Bore

(2)Full Bore

(3)V-shaped Bore


(1) Manual control

(2) Pneumatic Ball Valve Actuator

(3) Electric Ball Valve Actuator

(4) Hydraulic Ball Valve Actuator


4. Seat

Discs lie in between the body and the ball. Seats provide a seal between the two and support the ball.

For ball valves, suitable ball valve seat materials can be selected according to different working environments.

(1) Peek Ball Valve Seat

Ball Valve Parts (2)

It is a high temperature resistant thermoplastic and can be used for a long time at 250°C. Compared with other high temperature resistant plastics such as ZJCLV, etc., the upper limit of the operating temperature is nearly 50°C higher, and PEEK resin is not heat resistant. Compared with other high temperature resistant plastics, the cloth mesh has high strength, high modulus, high fracture toughness and excellent dimensional stability.

(2) PTFE Ball Valve Seat

Ball Valve Parts (2)

a. PTFE is an engineering plastic with excellent comprehensive properties, known as the king of plastics.

With excellent chemical stability, even at high temperature and concentrated acid, concentrated alkali or strong oxidant, it does not work. And boiled in concentrated sulfuric acid, concentrated nitric acid, hydrochloric acid or even in aqua regia, it’s weight and performance also are unchanged.

b. It has high heat resistance and cold resistance.

c. It has a very low coefficient of friction and is a good self-lubricating material.

d. It has excellent water resistance, does not absorb water at all, and has good weather resistance and anti-aging properties.

5. Ball

The ball is designed with a center bore (hole)where the media flows through. The direction of the ball is controlled by turning the stem.They are usually made of stainless steel, PVC, chrome plated steel or chrome plated brass. The ball design is categorized as floating or trunnion based on their design and support.

(1) Floating Ball design

The valve seats provide support to the ball to accommodate for different temperature applications. This is the most commonly used ball design.

(2) Trunnion Mounted Ball design

The ball is supported on the bottom and top to reduce load on the valve seats. This design is used in high quality valves to provide reliable sealing in both high and low-pressure applications.

Ball Valve Parts (2)

6. Bore

(1) Reduced Bore

The bore size of these valves is smaller than the diameter of the inlet/outlet connections. Thus, there is a friction loss in the system. However, the losses are still small in comparison to other valves. Most ball valves use a reduced bore design.

Ball Valve Parts (2)

(2) Full Bore

A full bore design is also called a full port design. The bore size of these valves is the same size as the diameter of the pipe. Thus, there is no extra friction loss and they are also easy to clean. However, due to its larger diameter, the cost is slightly higher and not required for most application, for which standard reduced bore is sufficient.

Ball Valve Parts (2)

(3) V-shaped Bore

The bore in these valves have a V-shaped profile. Thus, a precise flow rate can be achieved by rotating the ball. A linear flow can be achieved by optimizing the profile of the V-shaped bore.

Ball Valve Parts (2) Ball Valve Parts (2)

7. Actuator

Although most small ball valves can use handwheels, large ball valves or some other dangerous working environments are not suitable for this method. So there are also other ball valve actuators.

(1) Manual Control

These are designed with handles or levers that must be controlled by an operator. This option is not intended for high-cycle applications.

Ball Valve Parts (2)

(2) Pneumatic Ball Valve Actuator

Pneumatic ball valves require compressed air as a power source. This option is best for applications that require high durability and fast cycling times.

Ball Valve Parts (2)

(3) Electric Ball Valve Actuator

Applications without access to compressed air rely on electric ball valve actuators, which are also known as motorized ball valves. This option is best for low cycle speeds.

Ball Valve Parts (2)

(4) Hydraulic Ball Valve Actuator

Hydraulic actuators are similar to pneumatic, but use pressurized fluid (water or oil) instead of air. This option provides more torque output than others.

Ball Valve Parts (2)

8. Question

If you have any questions, please consult us: