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 Flange Rubber Disc Soft Seal Swing Check Valve Supplier, Suppliers

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Wholesale Flange Rubber Disc Soft Seal Swing Check Valve Supplier, Suppliers

Type: Rubber flap type

Series: H44X-10/16

Size: DN40-DN300/2”-12”

Pressure rating: PN6/10/16

Design standard: DIN F6

Service: OEM&ODM

The rubber seat non return valve combines the high strength of ductile iron with the flexible sealing advantage of rubber flaps.

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Product Description

Valve Type:	Swing check valve	Structure:	Rubber flap type
Standard:	DIN F6	Workmanship:	Investment casting
Sealing Direction:	Single-directional	Sealing Grade:	Zero leakage
Temperature:	-20°C < T < 120°C	Operation:	Self-starting

Characteristics

Boasting a ductile iron body and an elastic rubber flap core, this automatic check valve operates without any external drives. It leverages forward medium thrust to open the rubber flap for smooth circulation, and relies on reverse medium pressure paired with the flap’s elastic reset force to deliver leak-proof sealing. The valve’s standout design merges the exceptional structural strength of ductile iron with the unrivaled flexible sealing advantages of rubber flaps, ensuring optimal performance in diverse low-pressure applications.

Advantages

1. Flexible seal, excellent leak proof performance

The valve disc is made of elastic rubber material and is in surface contact with the valve seat for sealing. It can automatically compensate for minor wear and deformation of the sealing surface and achieve a tight fit even under low pressure conditions, effectively avoiding medium leakage. Compared to metal hard sealed check valves, they have stronger adaptability to medium pressure fluctuations, especially suitable for pipeline systems with non particle or small particle media such as clean water and sewage.

2. Simple structure, low failure rate

Without vulnerable moving parts such as hinges, springs, and shafts, traditional check valves avoid the problem of opening and closing failure caused by component rust, jamming, and fatigue fracture at the root. The rubber valve disc is wear-resistant, anti-aging, and has a long service life, greatly reducing the maintenance frequency and replacement cost of the valve.

3. Easy installation and strong adaptability

The valve body is mostly made of ductile iron material, which is lightweight and has high strength. The flange connection method can be directly connected to the pipeline without complex calibration; Supports various installation methods such as horizontal and vertical (bottom-up), suitable for diverse scenarios such as urban water supply and drainage, sewage treatment plants, high-rise buildings, and agricultural irrigation.

Packing

Standard export wooden case packaging

Application Scenarios

This valve finds extensive application across diverse sectors including urban water supply and drainage networks, sewage treatment facilities, fire protection systems, HVAC installations, water treatment plants and farmland irrigation systems. It demonstrates superior suitability for low-pressure, high-flow pipeline systems where the conveyed medium contains trace amounts of impurities, and is recognized as a standard anti-backflow solution for civil construction and municipal engineering applications.

Material

Components name	Material
Valve body Valve cover	Cast iron, ductile iron, cast steel
Valve petal	Rubber Combination components
Spring	Stainless steel

Dimension

DN (mm)	L	D	D1	dn	n
50	203	165	125	17.5	4
65	216	185	145	17.5	4
80	241	200	160	17.5	8
100	292	220	180	17.5	8
150	356	285	240	22	8
200	495	340	295	22	8
250	622	395	350	22	12
300	698	445	400	22	12
350	787	505	460	22	16
400	914	565	515	22	16
450	978	615	565	26	20
500	978	670	620	26	20
600	1295	780	725	30	20

Frequently Asked Questions

Q: What is the main structural feature of this swing check valve?

This valve features a ductile iron body combined with an elastic rubber flap core. It functions automatically without external drives, relying on medium thrust to open and pressure/elastic reset force to seal tightly.

Q: How does the rubber flap design achieve zero leakage?

The elastic rubber valve disc provides surface contact with the valve seat. It automatically compensates for minor wear and deformation, maintaining a tight leak-proof seal even under low-pressure conditions.

Q: What is the applicable operating temperature range?

The valve is suitable for medium temperatures ranging between -20°C and 120°C (-20°C < T < 120°C).

Q: Can this valve be installed vertically?

Yes, the valve supports diverse installation orientations including horizontal and vertical (bottom-up flow) pipeline configurations using standard flange connections.

Q: What manufacturing standard and materials are utilized?

The valve is built to the DIN F6 standard via investment casting. Main components include a cast iron/ductile iron/cast steel body, rubber combination valve petal, and stainless steel spring.

Wholesale Flange Rubber Disc Soft Seal Swing Check Valve Supplier, Suppliers

Product Description

Characteristics

Advantages

Packing

Application Scenarios

Material

Dimension

Frequently Asked Questions

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