Soft Back Seat WCB Wafer Butterfly Valve 4 inch

The main difference between soft back seat wafer butterfly valve and hard back seat wafer butterfly valve is the seat material:

•  Compared with the hard-backed valve seat, the soft-backed WCB butterfly valve has a wider contact surface with the pipe flange, and the installation and sealing performance is better, without the need for a special flange for butterfly valves;
• The soft-backed valve seat is highly replaceable and does not require any special tools. The replacement can be completed;
• The wall thickness of the hard-backed valve body is relatively thin, and the valve body is easily deformed. The wall thickness of the soft-backed valve body is larger than that of the hard-backed valve body, and the valve body is heavier. The different shape designs prevent the valve body from deforming. Deformation.
• The vulcanization process of the soft-backed valve seat is more perfect, and there will be no phenomenon of immature rubber of the hard-backed valve seat. The rubber performance is more reliable.
• 4 butterfly valve refers to 4 inch WCB butterfly valve, it is the most commonly used size in the market and is also the one we have the most stock of.
• WCB butterfly valve is commonly used for valve bodies due to its cost-effectiveness compared to stainless steel. And its ability to handle high-pressure and high-temperature applications (up to +800°F or +425°C).
• The soft-backed WCB butterfly valve has small torque.

Q1: What are the temperature and pressure limits of this WCB wafer butterfly valve?

A: The temperature limit of this butterfly valve is closely related to the valve seat material; different valve seats have different temperature limits. This EPDM valve seat has a temperature range of -10 to 110 degrees Celsius.

Q2: What is the difference between the soft, replaceable seat butterfly valve and the hard-backed seat valve?

A: The primary difference lies in the valve seat structure. Butterfly valves with replaceable soft seats feature detachable rubber seats that facilitate maintenance and reduce replacement costs, whereas butterfly valves with hard-backed seats utilize rubber seats bonded to or supported by a rigid metal backing ring, thereby offering superior strength and more stable sealing performance.

Q3: Can the soft seat be replaced without dismantling the entire pipeline?

A: The valve needs to be removed from the pipeline, but the valve seat itself can be quickly replaced manually without special equipment.

Q4: Does this valve require custom flanges for installation?

A: As long as it conforms to the accompanying standard specifications, its wider sealing surface is compatible with standard pipe flanges (such as ASME B16.5, EN1092), and no special flanges are required.

Q5: What certifications do your butterfly valves hold for international markets?

A: ISO 9001 (International Organization for Standardization) is a quality management system certification.

CE (Conformité Européenne) products comply with relevant EU safety, health, and environmental regulations.

WRAS (Water Regulations Advisory Scheme) is the UK’s accreditation system for the drinking water industry.