More than Coupling with SME
for Industrial Flexible Connection & Quick-Disconnection

Wafer-Type Butterfly Valves: Construction, Design, and Operational Procedures for Road Water Tankers


Wafer-type butterfly valves are widely used in road water tankers to control the flow of water during charging and discharging operations. These valves offer numerous benefits in terms of construction, design, ease of use, and operational procedures. In this article, we will delve into the various aspects of wafer-type butterfly valves, including their construction and design, advantages, and operational procedures for road water tankers. Additionally, we will also touch upon hose couplings commonly used in conjunction with these valves, such as camlock and threaded fittings.

Construction and Design of Wafer-Type Butterfly Valves

Wafer-type butterfly valves consist of a flat, disc-shaped closure element that rotates within the valve body. The valve disc is mounted on a central shaft, which is connected to an actuator or handle for manual operation. The valve body typically has a wafer design, meaning it has no lugs or flanges and is installed between two pipe flanges using bolts and nuts.

The valve disc is the central component responsible for controlling the flow of water. When the valve is fully open, the disc is positioned parallel to the flow direction, allowing unrestricted flow. Conversely, when the valve is closed, the disc rotates perpendicular to the flow direction, blocking the passage of water.

Benefits of Wafer-Type Butterfly Valves in Construction and Design

Compact Design: Wafer-type butterfly valves have a compact and lightweight design, making them suitable for applications where space is limited, such as road water tankers. Their compactness also enables easier installation and maintenance.

Cost-Effective: These valves offer cost advantages compared to other valve types. They are typically more affordable and require lower installation and maintenance costs.

Quick Operation: The quarter-turn operation of wafer-type butterfly valves allows for quick and efficient opening and closing, reducing downtime during charging and discharging operations of road water tankers.

Low Pressure Drop: The streamlined design of the valve disc minimizes pressure drop across the valve, ensuring efficient flow control and minimizing energy losses.

Tight Shut-Off: Wafer-type butterfly valves provide a reliable and tight shut-off, preventing leakage and ensuring secure connection and disconnection of hose couplings.

Operational Procedures for Road Water Tankers

  • Charging Procedure:

a. Ensure that the wafer-type butterfly valve is closed before connecting the tanker to a water source.

b. Connect the hose coupling (e.g., camlock or threaded fitting) securely to the valve outlet using appropriate connections and fasteners.

c. Open the wafer-type butterfly valve gradually to initiate water flow into the tanker.

d. Monitor the filling process and close the valve once the desired water level is reached.

  • Discharging Procedure:

a. Position the tanker at the desired discharge location and ensure stability.

b. Connect the hose coupling (camlock or threaded fitting) to the discharge point securely.

c. Open the wafer-type butterfly valve gradually to start water discharge.

d. Monitor the flow rate and adjust the valve as needed to achieve the desired discharge rate.

e. Once the tank is emptied, close the valve and disconnect the hose coupling carefully.

Hose Couplings: Camlock and Threaded Fittings

  • Camlock Fittings:

Camlock fittings are commonly used in conjunction with wafer-type butterfly valves for quick and secure connection and disconnection. These fittings consist of male and female couplers with handles that allow for easy and rapid coupling. They are available in various sizes and materials to suit different applications.

  • Threaded Fittings:

Threaded fittings, such as NPT (National Pipe Thread) or BSP (British Standard Pipe) fittings, are another type of hose coupling used with wafer-type butterfly valves. They feature male and female threads that can be tightened together, providing a reliable and leak-free connection.


Wafer-type butterfly valves play a crucial role in controlling the flow of water in road water tankers during charging and discharging operations. Their compact design, cost-effectiveness, quick operation, and tight shut-off make them highly suitable for such applications. By following the operational procedures and using appropriate hose couplings like camlock and threaded fittings, road water tanker operators can ensure efficient and secure water transfer.

We are all ears for you:
       +86 (0)21-5878-0977
Mon-Fri   09:00 — 18:00
SME Industrial Co. Ltd
2229 E. Weiqing Rd, Jinshan
Shanghai 201508 China
         SME Mfg Base
1 Chaoyang Rd, Wuhu
Anhui Prov. 241000 China
Copy of business license, production and capability files, ISO 9001 certification, Watermark & type test approval documents.
All couplings, hose accessories, and valves for water pumping systems are categorized separately.