Name: Anti-condensation Butterfly Valve
Brand: JIMAI
SKU: 00048
Rating: 4.9 (74 reviews)

Anti-condensation Butterfly Valve

An anti-condensation butterfly valve is a quarter-turn flow control device specifically engineered for chilled water, refrigeration and low-temperature HVAC systems where conventional valves are prone to surface sweating.

Its structure is designed to reduce cold transfer from the internal medium toward the valve exterior, helping prevent moisture from condensing on exposed surfaces.

Continuous condensation around conventional chilled-water valves may cause water dripping, surface corrosion, mold growth and damage to surrounding insulation.

JIMAI's integral aluminum-alloy anti-condensation butterfly valve combines a long heat-insulating valve neck, aluminum-alloy body and resilient seated butterfly valve structure for low-temperature HVAC applications.

The valve maintains normal butterfly-valve quarter-turn operation, with the valve disc rotating through 90 degrees for opening, closing and flow regulation.

Chilled Water Systems

Designed for low-temperature chilled-water piping where exposed conventional valves may develop condensation.

HVAC Systems

Suitable for HVAC water systems requiring compact shut-off and flow regulation.

Refrigeration Systems

Suitable for low-temperature refrigeration water circuits where external condensation needs to be controlled.

Working Principle of Anti-condensation Butterfly Valve

Condensation occurs when the surface temperature of the valve falls below the dew-point temperature of the surrounding air.

When low-temperature chilled water flows through the valve, cold energy is transferred to the inner part of the valve body.

The long heat-insulating valve neck increases the heat-conduction path between the cold valve body and the upper operating section. This hinders cold transfer toward the actuator and the external valve shell.

Together with the aluminum-alloy body, this structure is intended to keep the external surface temperature closer to ambient temperature and above the dew point, helping avoid condensation and dripping.

Low-temperature Medium

Chilled water flows through the valve and transfers cold energy to the internal valve body.

Extended Valve Neck

The long heat-insulating neck increases the thermal-conduction distance toward the operating section.

Reduced Cold Transfer

Less cold energy is transferred toward the actuator and exposed upper valve surface.

Reduced Condensation

Keeping the external surface warmer helps keep it above the dew point and reduces condensation and dripping.

Materials, Structure and Dimensions

Valve Structure

Anti-condensation butterfly valve exploded structure diagram

No.	Parts	Standard Material	Options
1	Seat	NBR	EPDM / VITON
2	Disc	SS304	DI / SS316
3	Body	Aluminum Alloy	Aluminum Alloy
4	Stud	SS304	SS316
5	Stem	40Cr Carbon Steel	SS304
6	Oil-free Bearing	Copper-base Powder Metallurgy	Copper-base Powder Metallurgy
7	O-Ring	NBR	EPDM / VITON

Dimensional Drawing

Main dimensions: DN50-DN250. Unit: mm.

DN	D	H1	H2	H3	H4	L1	L2	L3	n-d
DN50	120	54	138	90	107	42.2	147	70	4-18
DN65	134	62	147	108	107	46	200	92	4-18
DN80	149	68	158	108	107	44.2	200	92	8-18
DN100	176	83	180	108	107	50.2	221	92	8-18
DN125	210	97	190	140	107	56	262	120	8-18
DN150	235	110	206	140	107	56	262	120	8-22
DN200	295	141	244	160	107	61	301	137	8-22
DN250	357	176	274	198	122	64	395	175	12-22

Why Use an Anti-condensation Butterfly Valve in HVAC Systems?

The integral aluminum-alloy anti-condensation butterfly valve is mainly designed for chilled-water and HVAC systems. Its die-cast aluminum-alloy body and long heat-insulating valve neck are intended to reduce cold transfer toward exposed valve components.

Prevent Condensation and Dripping

The long heat-insulating neck helps break the cold bridge and reduce water dripping.

This helps protect ceilings, electric actuators and surrounding equipment.

Lightweight for Easy Installation

The die-cast aluminum-alloy body is lighter than a conventional cast-iron valve body.

Reduced weight lowers pipeline load and makes handling and mounting easier.

Good Corrosion Resistance

Aluminum alloy provides good anti-rust performance for HVAC water-system applications.

This helps reduce moisture-related deterioration around the valve.

Energy-saving Thermal Insulation

The anti-condensation structure reduces outward loss of cooling capacity from the chilled-water system.

This helps limit unnecessary heat exchange with ambient air.

Compact Quarter-turn Structure

The butterfly valve uses 90-degree rotation for opening and closing.

It occupies little space and is suitable for equipment rooms and pipe shafts.

Low-maintenance Design

The integrated design reduces the need for additional insulation wrapping around the valve operating area.

It also helps avoid dampness, mildew and deterioration of external insulation layers.

JIMAI Manufacturing and Quality Advantages

DN50-DN300 Sealing Test Capability

JIMAI is equipped with dedicated sealing test benches covering butterfly valves from DN50 to DN300.

Every butterfly valve undergoes leakage testing before delivery to verify sealing performance and help prevent leakage problems from reaching the customer.

Enlarged 40Cr Valve Stem

JIMAI adopts 40Cr carbon steel as the standard valve stem material and uses an enlarged-diameter stem design.

The design provides higher stem hardness and mechanical strength for high-intensity and high-frequency opening and closing operations.

In-house Painting Line

JIMAI operates an in-house painting line for controlled surface finishing and consistent valve appearance.

Custom color options can also be supported according to customer requirements.

Valve Stem Measurement Comparison

The following measurement photographs compare the JIMAI butterfly valve stem with another supplier's valve stem.

JIMAI Butterfly Valve Stem

JIMAI butterfly valve 11 by 11 square stem measurement

JIMAI square stem: 11 × 11 as shown in the supplied measurement photograph.

JIMAI butterfly valve stem thickness measurement

JIMAI stem thickness: 14 as shown in the supplied measurement photograph.

Other Supplier Valve Stem

Other supplier butterfly valve 11 by 11 square stem measurement

Other supplier square stem: 11 × 11 as shown in the supplied comparison photograph.

Other supplier butterfly valve stem thickness measurement

Other supplier stem thickness: 12.5 as shown in the supplied comparison photograph.

Leakage Testing Before Delivery

JIMAI Butterfly Valve Leakage Testing

JIMAI uses dedicated butterfly valve sealing test equipment covering sizes from DN50 to DN300.

Every butterfly valve undergoes leakage testing before delivery. The test is used to verify sealing performance and identify potential leakage before shipment.

DN50-DN300 butterfly valve test capability
Leakage test before delivery
Sealing performance verification
Individual valve quality inspection

JIMAI butterfly valve leakage testing machine

Anti-condensation Butterfly Valve

Product Advantages