What types of valves does KR Valve manufacture?

KR Valve manufactures more than 500 valve products, including wafer, lug, concentric and double eccentric butterfly valves, resilient seat, metal seat and knife gate valves, dual disc, swing, lift and ball type check valves, ball valves, hydraulic water control valves such as 200X pressure reducing valves and 100X remote float valves, and Y type strainers.

Which international standards do KR valves follow?

Our range covers common international standards such as DIN F5 face-to-face gate valves, BS5163 resilient seat gate valves, BS5153 dual disc check valves, ANSI flanged strainers and PN16 pressure rated water control valves. Non-standard designs can be engineered to your drawings.

Do you offer OEM valve manufacturing?

Yes. In addition to our own KR brand, we provide OEM services, including customer branding, specified body and seat materials, actuation options and project-specific packaging.

Should I choose a wafer or a lug butterfly valve?

Wafer butterfly valves are lighter and more economical and are clamped between two flanges, making them ideal for standard water and HVAC lines. Lug butterfly valves have threaded lugs that allow dead-end service and removal of downstream piping without draining the whole line, which suits maintenance-critical systems.

How is valve quality controlled before shipment?

Every process is inspected from raw material to finished product, and 100% of finished valves are inspected before dispatch. Production plans and lead times are defined upfront through full-chain supply control.

Wholesale Automatic air release valve single port type WCB material PN16 Manufacturer, Factory

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Wholesale Automatic air release valve single port type WCB material PN16 Manufacturer, Factory

Type：Flanage type

Series：QB1-10/16

Size: DN40-DN300/2”-12”

Pressure rating: PN6/PN10/PN16/PN25

Design standard: BS/API/DIN/JIS

Service: OEM&ODM

The single port air release valve with a single hole large exhaust outlet, rapid and large exhaust in the early stage of water injection, micro continuous exhaust in operation, elimination of air resistance, automatic sealing after full water, no dripping, no leakage.

Application Scenarios

The flange single port exhaust valve mainly used at the high point exhaust of municipal water supply, fire protection, heating and ventilation, high-rise water supply and long-distance water transmission pipelines.

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Product Description

Valve Type:	Exhaust valve	Structure:	Single port
Standard:	BS/API/DIN/JIS	Workmanship:	Investment casting
Sealing direction:	Single-directional	Sealing grade:	Zero leakage
Temperature:	-20°C < T < 120°C	Operation:	Self-starting

Single port air exhaust valve ductile iron PN16

Characteristics

The single port air vent valve is fully automatic operation, no manual operation, low resistance, no impact on pipeline flow, simple maintenance, not easy to jam.

Advantages

1. Simple structure and low failure rate

There is only floating ball + sealing nozzle inside, without complex mechanism.

It is not easy to jam and block, and the clean water system is basically maintenance free.

2. Wide application scope and strong universality

Municipal water supply, fire protection, heating and ventilation, irrigation and industrial circulating water can be used.

The caliber is complete, and the common specifications of DN25~DN100 are complete.

Easy installation and maintenance.

3. Vertical installation

During maintenance, only the front valve needs to be closed, and the whole pipeline does not need to be disassembled.

4. Cost-effective

It is cheaper than the compound exhaust valve and more durable than the small caliber screw valve.

Low cost for long-term use, suitable for batch use in projects.

Material

Body, bonnet	Cast iron HT200 / Stainless steel / Carbon steel
Floating ball	304 Stainless steel Vent: H59 Steel H59 brass
Sealing ring	NBR
Elastic screw	A3

Main Dimensions

DN (mm)	D	D1	D2	ϕ	H
15	95	65	45	135	210
20	105	75	55	135	210
25	115	85	65	135	210
40	140	115	80	150	210
150	160	125	100	150	210

Packing

Standard export wooden case packaging.

Frequently Asked Questions (FAQ)

Q1 What is the main function of this single port air exhaust valve?

It automatically discharges trapped air pockets during pipeline operation without requiring manual intervention, helping to maintain flow efficiency and protect against air blockage.

Q2 What temperature range and manufacturing standards does it support?

The valve operates within a temperature range of -20°C < T < 120°C and complies with international standards including BS, API, DIN, and JIS.

Q3 Does the valve provide reliable sealing performance?

Yes, it utilizes a single-directional sealing direction with a zero-leakage sealing grade under recommended operating conditions.

Q4 How does vertical installation simplify pipeline maintenance?

With vertical installation, maintenance only requires closing the isolated front valve—there is no need to disassemble the entire pipeline system.

Q5 What materials are used for the main valve body and floating ball?

The body and bonnet are available in Cast Iron HT200, Stainless Steel, or Carbon Steel, while the internal floating ball is constructed from high-grade 304 Stainless Steel.

Wholesale Automatic air release valve single port type WCB material PN16 Manufacturer, Factory

Product Description

Characteristics

Advantages

Material

Main Dimensions

Packing

Frequently Asked Questions (FAQ)

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