Rubber Disc Swing Check Valve HC44X

Rubber Disc Swing Check Valve Purpose

This valve is used mainly for water supply and drainage system and can be set on the pump outlet to prevent the pump from getting harmed by the medium back flow. it can also be set on the mouth of a water outlet pipe to prevent the medium from back flow.

Rubber Disc Swing Check Valve Definition and Components

Definition:

A Rubber Disc Swing Check Valve HC44X is a type of check valve designed to prevent reverse flow in pipelines. The designation indicates:

• HC44X: Chinese standard designation according to GB/T 13932 for "rubber disc swing check valve"
• Rubber Disc: Features a rubber-sealed disc (clapper) instead of metal-to-metal seating
• Swing Type: The disc pivots on a hinge pin, swinging open with forward flow and closing by gravity/backflow

Main Parts:

• Body: Typically cast iron, ductile iron, or cast steel with flanged/wafers ends
• Disc/Clapper: Rubber-coated or fully rubber disc mounted on hinge assembly
• Hinge Pin: Stainless steel pin allowing disc to swing freely
• Hinge Arm: Connects disc to hinge pin
• Seat Ring: Machined surface where rubber disc seals (sometimes integral with body)
• Cover/Bonnet: Provides access to internal components
• Gasket: Seals between body and cover
• Bolting: Fastens cover to body
• External Coating: Epoxy, paint, or galvanized coating for corrosion protection

Role, Characteristics, and Application Scenarios of Rubber Disc Swing Check Valve in Pipelines

Water supply valve Functions in Pipelines:

• Backflow Prevention: Automatically closes to prevent reverse flow
• Water Hammer Mitigation: Reduces slam compared to metal-seated check valves
• System Protection: Protects pumps and equipment from damage due to reverse flow

Operational Features:

• Bubble-Tight Seal: Rubber disc provides zero-leakage shutoff
• Low Pressure Loss: Streamlined design minimizes flow resistance
• Quiet Operation: Rubber cushioning reduces water hammer and noise
• Bidirectional Installation: Can be installed in horizontal or vertical pipelines (flow direction upward)
• Self-Cleaning: Sweeping action helps prevent debris accumulation

Check Valve for Water Application Scenarios:

• Pump Discharge Lines: Prevent backflow when pumps stop
• Water Distribution Systems: Maintain directional flow in municipal networks
• HVAC Systems: Chilled and heating water circuits
• Industrial Process Lines: Chemical, food processing, and pharmaceutical applications
• Irrigation Systems: Maintain pressure in agricultural water systems
• Fire Protection Systems: Sprinkler and standpipe systems

Scenario Diagram:

Rubber Disc Swing Check Valve Standards: Materials, Design, and Connections

Standard Category	Applicable Standards	Specific Requirements
Design Standard	GB/T 13932-2010	Main Chinese standard for iron check valves
International Equivalents	API 594, BS 1868, AWWA C508	Similar international standards
Material Standard	GB/T 12226 (Cast Iron)	Body materials specification
	GB/T 12227 (Ductile Iron)
	GB/T 12229 (Carbon Steel)
Flange Standard	GB/T 17241.6 (Cast Iron Flanges)	Flange dimensions and drilling
	GB/T 9113 (Steel Flanges)
Rubber Disc Standard	GB/T 21873 (Rubber Seal Rings)	EPDM, NBR, Viton specifications
Testing Standard	GB/T 13927-2008	Pressure testing requirements
Coating Standard	GB/T 8923.1	Surface preparation and coating

Pressure Ratings:

PN10, PN16, PN25 (Standard)

Class 125, Class 150, Class 300 (US Standards)

Up to 16 bar (230 psi) typical working pressure

Size Range:

DN50 to DN1200 (2" to 48")

Larger sizes available with special order

How to Select Rubber Disc Swing Check Valve

Technical Specification Checklist:

Critical Parameters:

•   Size: DN [specify exact size]
•   Pressure Rating: PN10/PN16/PN25
•   Connection Type: Flanged (RF/FF), Wafer, Grooved
•   Body Material: Cast Iron/ Ductile Iron/ Carbon Steel
•   Disc Material: Rubber Type (EPDM/NBR/Viton/Hypalon)
•   Hinge Pin Material: Stainless Steel 304/316
•   Coating: Epoxy/ Fusion Bonded Epoxy/ Galvanized
•   Temperature Range: -10°C to 80°C (standard EPDM)

Performance Requirements:

•   Leakage Rate: Class A (Zero leakage)
•   Cracking Pressure: 0.07-0.1 bar (1-1.5 psi)
•   Full Flow Opening: At specified velocity
•   Close Time: <1 second for water hammer control

Certification Requirements:

•    GB/T 13932 compliance certificate
•    ISO 5208 Leakage Class test report
•    Material certificates (EN 10204 2.1/3.1)
•    Third-party inspection reports if required
•    CE/UL/FM certifications for specific markets

Supplier Evaluation Criteria:

• Manufacturing Capability
• In-house rubber molding facility
• CNC machining for precision components
• Quality control lab with testing equipment

Experience & References

• Minimum 3 years production experience
• Successful projects in water/wastewater sector
• Customer references with contact information

Quality Assurance

• ISO 9001:2015 certification
• Material traceability system
• Comprehensive testing procedures

Commercial Considerations:

• Pricing: Compare FOB, CIF, DDP terms
• Payment: 30% deposit, 70% before shipment
• Delivery: 30-45 days for standard sizes
• Warranty: Minimum 12-24 months
• Spare Parts: Availability of rubber discs and seals

Pre-Shipment Inspection for Export Rubber Disc Swing Check Valve and Key Considerations

Inspection Checklist:
Item	Inspection Method	Acceptance Criteria
Visual Inspection	Visual examination	No cracks, porosity, or defects
Dimension Check	Calipers, tape measure	Flange dimensions per standard
Face-to-Face	Tape measure	Within GB/T 12221 tolerances
Disc Movement	Manual operation	Free swinging, no binding
Sealing Surface	Visual/feeler gauge	Smooth, no nicks or scratches
Coating Thickness	Elcometer	200-300渭m, no bare spots
Markings	Visual	Clear stamping: DN, PN, material, arrow
Weight	Scale	Within 5% of catalog specification

Pressure Testing Procedure:

1. Shell Test (Body Strength):

- Pressure: 1.5 × PN for minimum 60 seconds

- Medium: Clean water

- Criteria: No leakage, weeping, or permanent deformation

2. Seat Test (Sealing Performance):

- Pressure: 1.1 × PN for minimum 60 seconds

- Medium: Water or air (air preferred for sensitivity)

- Criteria: Zero visible leakage (Class A)

- Method: Install valve in test bench, pressureize downstream side

3. Backflow Test:

- Pressure: 1.1 × PN reverse pressure

- Criteria: Complete shutoff, no leakage

Functional Tests:

Cracking Pressure Test

Measure pressure when disc begins to open

Typical: 0.07-0.1 bar (varies by size)

Full Flow Test

Verify disc opens fully at design velocity

No obstruction to flow path

Closing Test

Time closure from 90% open to fully closed

Should be ≤1 second for sizes ≤DN300

Packaging Requirements:

Individual Valve Packaging:

1. Protection:

- Rubber disc protected with plastic cap or tape

- Flange faces covered with 3mm plywood or plastic

- Hinge pin area lubricated and protected

2. Cleaning:

- Internal surfaces clean and dry

- No sand, debris, or foreign material

3. Preservation:

- VCI (Vapor Corrosion Inhibitor) paper if required

- Desiccant bags for humid destinations

Export Packaging:

For DN ≤ 200:

- Individual cardboard boxes with foam inserts

- Stacking limit: 4 layers maximum

For DN > 200:

- Wooden crates with steel reinforcement

- Foam or bubble wrap cushioning

- Proper lifting points marked

Labeling Requirements:

- Gross/net weight

- "Fragile" and "Keep Dry" symbols

- Direction arrows ("This Side Up")

- Valve serial numbers

- Destination and handling instructions

Documentation Package:

Commercial Invoice (3 copies)

Packing List with detailed contents

Bill of Lading/Air Waybill

Certificate of Origin

Test Certificates:

Pressure test reports

Material certificates

Coating thickness report

Inspection certificate

Installation & Maintenance Manual

Warranty Certificate

Special Precautions:

For Rubber Components:

Storage temperature: 0°C to 35°C

Avoid direct sunlight and ozone exposure

Keep away from oils and solvents

Shelf life: 12 months maximum before installation

Shipping Considerations:

Container Loading:

Valves secured to prevent movement

Away from container walls (condensation)

Bottom layer on pallets for air circulation

Climate Control:

Desiccant: 200g per cubic meter

Humidity indicators in container

Avoid temperature extremes during transit

Handling:

Use proper lifting equipment

Never lift by handwheel or actuator

Stack according to manufacturer instructions

Common Defects to Reject:

Rubber disc with visible cracks, tears, or degradation

Disc not seating properly (light visible through closed valve)

Excessive play in hinge pin (>1mm radial movement)

Flange face damage affecting gasket sealing

Incomplete or incorrect markings

Test pressures not maintained during required duration

Evidence of improper storage or handling damage

Sampling Plan for Batch Inspection:

Order Quantity	Sample Size	Accept/Reject Criteria
1-15 valves	2 valves	0 defects accept, 1+ reject
16-50 valves	3 valves	0 defects accept, 1+ reject
51-90 valves	5 valves	1 defect accept, 2+ reject
91-150 valves	8 valves	2 defects accept, 3+ reject
151+ valves	13 valves	3 defects accept, 4+ reject

By following this comprehensive inspection protocol, buyers can ensure HC44X rubber disc swing check valves meet quality standards and perform reliably in their intended applications, while minimizing the risk of post-shipment issues and returns.

Rubber Disc Swing Check Valve Main dimensions(mm)

DN	L	D	D1	D2	b	n-Фd
50	200	156	125	99	17	4-19
65	225	180	145	120	17	4-19
80	245	195	160	135	18	8-19
100	297	215	180	154	19	8-19
125	297	245	210	180	19	8-19
150	360	280	240	210	22	8-23
200	475	335	295	265	22	12-23
250	490	405	355	320	22	12-28
300	550	460	410	370	25	12-28
350	610	520	470	429	27	16-28
400	660	580	525	480	28	16-31
450	705	640	585	548	30	20-31
500	750	715	650	609	31.5	20-34
600	900	840	770	720	36	20-37
700	971	910	840	794	36	24-37
800	1090	1025	950	901	38	24-40

 Note:1. Other specifications and flange standards are available upon request.

2. Design and specifications are subject to change without prior notice.