U-Type AWWA C504 Butterfly Valve With Replaceable Seat

Product Overview of AWWA C504 Butterfly Valve

Our AWWA C504 U shape butterfly valve with replaceable seat is designed for water supply, sewage treatment, and industrial pipeline systems. Compared with traditional flanged butterfly valves, the U-type design offers a more compact structure, lower cost, and easier installation.

This AWWA C504 resilient seated butterfly valve is manufactured in accordance with international standards. This ensures reliable sealing performance, durability, and long service life. The replaceable seat design allows easy maintenance without replacing the entire valve.

Features of AWWA C504 U-Type Butterfly Valves

• Compact U-Type Butterfly Valve Structure

The U-type butterfly valve has a compact structure to save space. It is less expensive than a common flange butterfly valve.

• AWWA C504 Standard Compliance

This butterfly valves meet the AWWA C504 standard for size, pressure, and material selection. They can meet the needs of water supply and sewage systems, including water supply pipes, drainage pipes, and industrial pipes.

• Replaceable Seat Butterfly Valve Design

The resilient dovetail seat of this AWWA C504 butterfly valve can be replaced easily without replacing the entire valve. This reduces maintenance costs and extends service life.

• Simple Installation

The double flanged butterfly valve can be installed between two flanged pipes. Furthermore, it can be installed at the end of the pipe system.

• Wide Size Range 

Suitable for large flow industrial butterfly valve systems.

Technical Specifications and Standards

ITEM	Standard
Design	EN593 | API609
Face to Face	AWWA C504
Top Flange	ISO5211
Flange Drilling	PN6 | PN10 | PN16 | ASME B16.5 CL150 | JIS 10K
Pressure Rating	PN6 | PN10 | PN16 | PN25 | CL150 | JIS 10K
Tightness Test	ISO5208 | API598 | EN12266-1

AWWA C504 Resilient Seated Butterfly Valve Parts Options

Parts	Ductile Iron type	WCB type	Stainless Steel Type	Duplex Stainless Steel Type
Body	Cast Iron(GG25) Ductile Iron(GGG40/50)	A216 A217 A105(forged)	SS304/ CF8 SS316/CF8M SS304L/CF3 SS316L/CF3M	2205 2507 1.4529
Disc	Ductile Iron with Ni coated Ductile Iron with nylon coated Ductile Iron with PTFE/EPDM lined Stainless Steel Duplex Stainless Steel Bronze		SS304/ CF8 SS316/CF8M SS304L/CF3 SS316L/CF3M 2205 2507 1.4529	2205 2507 1.4529
Seat	NBR, EPDM, PTFE, Viton, Hypalon, Silicon, PFA
Stem	SS416, SS431, SS304, SS316, Duplex Stainless Steel, Monel			Duplex Stainless Steel, Monel
Actuator	Hand Lever, Worm Gear, Electric, Pneumatic

Dimensions and Size Chart of U Shape Butterfly Valve (DN100–DN500)

SIZE	øD	øD1	L	H	H1	H2	∅2	ø3	4ødl	T*T
DN100	135	104.4	57.2	30	200	114	70	90	410	11*11
DN150	188.4	155.7	71.4	30	226	139	70	90	410	14*14
DN200	238.2	202.5	74.6	40	260	175	102	125	412	17*17
DN250	292.4	250.5	79.4	40	292	203	102	125	412	22*22
DN300	344.2	301.6	85.7	45	337	242	102	125	412	22*22
DN350	375.2	333.4	96.3	45	368	267	102	125	412	22*22
DN400	439.5	389.6	105	52	400	309	140	175	418	27*27
DN450	490.5	440.5	117	52	422	328	140	175	418	27*27
DN500	535.4	491.6	130	65	480	360	140	175	418	36*36

NOTE: Other paremeters please contact our sals staffs.

Applications of AWWA C504 Butterfly Valve

This AWWA C504 short pattern butterfly valve is widely used in:

• Municipal Water Supply

Potable water transmission: The AWWA C504 U shape butterfly valve is widely used in municipal water distribution systems to isolate and regulate potable water flow, providing reliable sealing and long-term performance.

• Water Treatment Plant

Raw water, filtered water, and clean water: This resilient seated butterfly valve is ideal for controlling raw water, filtered water, and treated water pipelines in water treatment plants, ensuring dependable shut-off and easy maintenance.

• Pump Station

Isolation valve: The replaceable seat butterfly valve is installed at pump inlets and outlets to isolate pumps during maintenance, reducing downtime and improving system reliability.

• Irrigation System

Agriculture: The U shape butterfly valve provides efficient flow control for agricultural irrigation networks, offering corrosion resistance, low operating torque, and a long service life.

• Reservoir

Distribution pipeline: Designed for large-diameter water distribution pipelines, this AWWA C504 butterfly valve ensures reliable isolation, stable operation, and easy seat replacement for reservoir inlet and outlet systems.

• Fire Protection System

Fire water pipeline: The resilient seated butterfly valve is suitable for fire protection and emergency water supply systems, providing quick shut-off and dependable sealing under demanding operating conditions.

Manufacturing Process of Butterfly Valve

Certificates of ZFA Butterfly Valve Manufacturer

WRAS

CE

ISO 9001

EAC Russia

1. What is a U Shape Butterfly Valve?

A U shape butterfly valve is a type of resilient seated butterfly valve designed with a short body structure. Compared with traditional wafer butterfly valves, It shares the same face-to-face (FTF) dimension as the wafer-style butterfly valve, but the flanged connection ensures greater stability.

2. What is AWWA C504 Butterfly Valve?

AWWA C504 butterfly valve is a standard specifically developed for rubber-seated butterfly valves used in waterworks applications. It defines requirements for valve design, materials, pressure ratings, testing, and performance to ensure reliable operation in water distribution systems.

3. What is the difference between a U Shape Butterfly Valve and a Wafer Butterfly Valve?

A wafer butterfly valve is more lightweight, while a U type butterfly valve is preferred for water transmission systems requiring higher strength and easier maintenance.

4. Why choose a replaceable seat butterfly valve?

A replaceable seat butterfly valve allows the rubber seat to be replaced without replacing the entire valve body. This reduces maintenance costs, minimizes downtime, and extends the service life of the valve.

5. What are the advantages of AWWA C504 Butterfly Valve?

An AWWA C504 butterfly valve offers reliable shut-off performance, corrosion-resistant materials, low operating torque, long service life, and suitability for large-diameter water pipelines. It is widely used in municipal water supply, treatment plants, and pumping stations.

6. Can the seat be replaced without removing the valve from the pipeline?

NO. Although the replaceable seat design allows maintenance personnel to replace the valve seat more easily compared with vulcanized seat butterfly valves, however, the valve must still be removed from the pipeline for replacement.

7. What seat materials are available for U Shape Butterfly Valve?

Common seat materials include:

EPDM for potable water and general water applications
NBR for oil-contaminated water applications

The suitable seat material depends on the operating medium and temperature.

8. Is the AWWA C504 Butterfly Valve suitable for drinking water?

Yes. When manufactured with approved materials such as EPDM rubber seats and suitable coatings, AWWA C504 resilient seated butterfly valves are widely used in potable water transmission and municipal water supply systems.

9. What pressure ratings are available for this butterfly valve?

AWWA C504 butterfly valves are commonly available in different pressure classes, but it is concentric soft seat butterfly valve, so the pressure rate is PN6, PN10, PN16, PN25, CL150, JIS 10K, etc.

10. What is the service life of a replaceable seat butterfly valve?

The service life depends on operating conditions, medium, pressure, and maintenance. With proper material selection and regular maintenance, a high-quality replaceable seat butterfly valve can provide decades of reliable service in water systems.

11. Can this butterfly valve be used for large diameter pipelines?

Yes. The U shape butterfly valve is especially suitable for large-diameter pipelines because its robust body design provides better structural strength, easier installation, and reliable sealing performance.
We are currently manufacturing finished products up to DN1800.

12. How does a resilient seated butterfly valve achieve sealing?

A resilient seated butterfly valve uses an elastic rubber seat that creates a tight seal between the valve disc and seat. The flexible sealing design compensates for minor imperfections and provides bubble-tight shut-off.

13. What actuators can be installed on AWWA C504 Butterfly Valves?

The valve can be equipped with different actuators according to operating requirements, including:

Manual gearbox actuator
Electric actuator
Pneumatic actuator
Hydraulic actuator

These options allow integration into manual, remote, or automated control systems.

14. What maintenance is required for a replaceable seat butterfly valve?

Regular inspection of valve operation, actuator condition, and sealing performance is recommended. The replaceable seat design makes future maintenance easier by allowing seat replacement instead of complete valve replacement.

15. Can ZFA provide customized AWWA C504 butterfly valves?

Yes. ZFA can provide customized solutions including different materials, coatings, actuator configurations, flange standards, pressure ratings, and OEM manufacturing according to customer requirements.