Double Union Ball Valve

Overview of Double Union Ball Valve

Sikerui Double Union Ball Valve is a highly efficient flow control device engineered with union connections on both sides of the valve body, enabling quick installation, removal, and maintenance without disrupting the pipeline system . This design features a spherical ball with a central bore that rotates 90 degrees to regulate fluid flow, providing full open-to-close functionality with minimal torque . Constructed from materials such as stainless steel (304/316), brass, PVC, or carbon steel, these valves comply with international standards including ASME B16.34, MSS SP-110, and ISO 5208, ensuring reliability in pressures up to 3000 PSI and temperatures ranging from -40°C to 250°C .

Double union ball valves are available in sizes from DN15 to DN600 (½” to 24″), with connection options like threaded, flanged, or socket-weld ends to suit diverse piping configurations . Their compact, lightweight design reduces space requirements and simplifies handling, while features such as full-port or reduced-port bores optimize flow efficiency for applications ranging from water distribution to chemical processing . With a service life exceeding 100,000 cycles, these valves offer leak-proof performance, corrosion resistance, and easy operation, making them ideal for industries like HVAC, pharmaceuticals, and municipal water systems .

Key Features of Double Union Ball Valve

Easy Maintenance and Installation

The double union design incorporates union nuts on both ends, allowing the valve to be detached without cutting pipes or dismantling adjacent components . This simplifies cleaning, inspection, and replacement, minimizing system downtime in critical operations such as water treatment plants or chemical processing units .
Leak-Free Sealing and Durability

Equipped with PTFE or EPDM seals and reinforced seats, the valve ensures bubble-tight shut-off, even under high-pressure fluctuations . The robust construction resists corrosion, abrasion, and chemical degradation, maintaining integrity in aggressive media like acids, alkalis, or slurries .
Space-Saving and Versatile Design

Its compact form factor reduces installation space by up to 30% compared to multi-valve assemblies, while the standardized unions support integration into existing systems without modification . The valve adapts to horizontal, vertical, or angled pipelines, with options for manual handles or automated actuators (pneumatic/electric) .
High Flow Efficiency

Full-port variants provide an unobstructed flow path that minimizes pressure drop and turbulence, ideal for applications requiring minimal flow resistance, such as irrigation or fire protection systems . Reduced-port versions offer cost savings for less demanding uses while maintaining reliable control .
Broad Material Compatibility

Materials like stainless steel 316 handle corrosive fluids, while PVC and brass variants suit water or low-temperature services . This versatility ensures compatibility with potable water, oils, gases, and chemicals, adhering to FDA, ISO, and NSF standards for safety .

Technical Specifications

Table: Standard Double Union Ball Valve Specifications

Parameter	Specification Range	Standards
Size Range	DN15 to DN600 (½” to 24″)	ASME B16.34, ISO 5208
Pressure Rating	150–3000 PSI (PN16–PN40)	ASME classes
Temperature Range	-40°C to 250°C	Material-dependent
Materials	Stainless Steel, Brass, PVC, Carbon Steel	ASTM/ASME standards
Connection Types	Threaded, Flanged, Socket-Weld	ISO 5211, ANSI B16.5
Seat Materials	PTFE, EPDM, NBR (fluid-specific)	ISO 9001 certifications

Typical Applications of Double Union Ball Valve

Water Treatment and Distribution: Used in municipal water systems and purification plants to isolate sections for maintenance, ensuring uninterrupted supply with leak-free performance .
Chemical and Pharmaceutical Processing: Stainless steel valves handle aggressive chemicals like acids or solvents, providing corrosion resistance and easy sterilization for FDA-compliant operations .
HVAC and Fire Protection Systems: Regulate water or coolant flow in heating/cooling circuits, with EPDM seals accommodating thermal cycling and pressure surges in commercial buildings .
Oil, Gas, and Mining: Full-port valves manage crude oil, gases, or abrasive slurries, with reinforced designs resisting erosion in upstream and midstream pipelines .
Agriculture and Irrigation: PVC valves distribute water or fertilizers in irrigation networks, leveraging UV resistance and durability for outdoor use .

Number	Name	Material	Quantity	Unit
3/4/8/9	O-Ring	EPDM/VITON	7	PCS
01	Socket/Socket End	UPVC/CPVC/PPH	2	PCS
02	Nut	UPVC/CPVC/PPH	2	PCS
05	Adapte/Connector	SUS304	1	PCS
06	Rod/Bar	UPVC/CPVC/PPH	1	PCS
07	Bracket/Support	UPVC/SUS304	1	PCS

Number	Name	Material	Quantity	Unit
10	Liner	UPVC/CPVC/PPH	1	PCS
11	Sealing Ring	PTFE	2	PCS
12	Ball	UPVC/CPVC/PPH	1	PCS
13	Body	UPVC/CPVC/PPH	1	PCS
14	Screw	SUS304	6-8	PCS
15	Electric Actuator	SUS304	1	PCS

SIZE	d	d1					d2
SIZE	d	ANSI	DIN	JIS	CNS	PPH	ANSI	DIN	JIS	CNS	PPH
1/2″ (15)	15	21. 40	20. 25	22. 30	22. 40	19. 30	21. 25	20. 05	21. 85	21. 90	19. 00
3/4″ (20)	20	26. 75	25. 25	26. 30	26. 40	24. 10	26. 58	25. 05	25. 85	25. 90	23. 80
1″ (25)	25	33. 52	32. 25	32. 33	34. 50	31. 00	33. 28	32. 05	31. 85	33. 90	30. 70
1–1/4″ (32	32	42. 28	40. 25	38. 43	42. 50	39. 00	42. 05	40. 05	37. 85	41. 90	38. 60
1–1/2″ (40)	40	48. 40	50. 25	48. 46	48. 60	49. 00	48. 12	50. 05	47. 75	47. 90	48. 60
2″ (50)	50	60. 45	63. 25	60. 56	60. 60	61. 90	60. 18	63. 05	59. 75	59. 90	61. 40
2–1/2″ (65)	63	73. 30	75. 25	76. 60	76. 70	73. 60	72. 85	75. 05	75. 87	75. 90	72. 30
3″ (80)	75	89. 25	90. 35	89. 60	89. 70	88. 30	88. 70	90. 05	88. 83	88. 90	86. 90
4″ (100)	90	114. 60	110. 35	114. 70	115. 00	108. 00	114. 10	110. 05	113. 98	113. 80	106. 40

规格（SIZE)	D	L	L1	L2	L3	W	H1	H2	F	M	I	Operating torque(NM)
1/2″(15)	54.00	106.00	23.00	60.00	52.00	84.00	52.50	27.50	31.00	–	M6	2.0
3/4″(20)	63.00	114.00	26.00	62.00	54.00	90.00	59.00	32.00	33.00	–	M6	2.5
1″(25)	73.50	128.00	29.00	70.00	62.00	106.00	67.50	37.25	40.00	–	M6	4.0
1-1/4″(32)	84.50	144.00	33.00	78.00	70.00	116.00	77.50	42.75	52.00	–	M8	5.0
1-1/2″(40)	98.00	158.50	35.50	87.50	79.50	128.00	90.00	50.00	52.00	–	M8	7.5
2″(50)	118.00	172.00	38.50	95.00	85.00	140.00	106.00	60.00	70.00	–	M8	8.5
2-1/2″(65)	150.00	278.00	64.50	144.50	132.50	198.00	136.50	76.50	84.00	45.00	M10	13
3″(80)	169.00	310.00	70.00	166.00	150.00	218.00	149.50	86.00	84.00	45.00	M10	16
4″(100)	190.00	352.00	84.00	181.00	157.00	235.00	166.00	98.00	121.00	49.00	M12	25

Frequently Asked Questions (FAQs)

Q1: How does a double union ball valve differ from a standard ball valve?

A double union valve features removable union nuts on both ends, enabling disconnection without pipe cutting, whereas standard valves require fixed installations or additional fittings for maintenance . This design accelerates servicing and reduces downtime in complex piping systems.

Q2: What materials are best for corrosive applications?

Stainless steel 316 or PVC are ideal for acids and chemicals, offering superior corrosion resistance, while brass suits potable water . Always match the material to the fluid’s pH, temperature, and pressure per ASTM guidelines.

Q3: Can these valves be automated?

Yes, models with ISO 5211 mounting pads support pneumatic, electric, or hydraulic actuators for remote control, allowing integration into automated processes .

Q4: What maintenance is required?

Routine seal inspections and cleaning every 6–12 months prevent debris buildup; replace worn seals every 5–10 years based on operating conditions .

Q5: Are they suitable for high-pressure steam?

For steam above 200°C, use carbon steel or alloy valves with metal seats; standard PTFE seals degrade under high heat .