Terminal Balancing Valve | 9527AB Series | FNPT x FNPT

The 9527AB Terminal Balancing Valve by Red-White Valve Corp. is engineered for high-performance hydronic systems requiring accurate flow regulation and lead-free compliance. Designed with threaded female-female NPT ends (ASME B1.20.1), this eco-conscious valve offers precise ON/OFF functionality and terminal balancing control—making it ideal for HVAC systems in commercial, residential, and institutional settings.

Key Features:

• Lead-Free Certified: Complies with AB1953 and NSF/ANSI 61 & 372 standards, containing less than 0.25% lead in wetted surfaces.
• Threaded NPT End Connection: For straightforward installation and compatibility with standard piping.
• Integrated Test Points: EPDM Perox gaskets and copper-sealed plugs for accurate ΔP measurement and easy flow commissioning.
• Actuator-Ready: Includes a threaded M30x1.5 connection for compatibility with RWV Vaurien linear actuators.
• Wide Temperature Range: Rated for water temperatures from 15°F to 260°F (with appropriate additives for extreme conditions).

• Pressure Rated: 300 WOG (300 psi @ 160°F, 150 psi @ 260°F).

Performance & Flow Regulation:

The 9527AB valve allows precise flow control with a regulating Cv tolerance of ±10% (as per BS7350). Flow is measured via the integrated test points using the formula:

Q = Cv × √(Δp)
(Where Q = Flow in GPM and Δp = Pressure Drop in psi)

The valve is engineered to operate optimally within the suggested flow ranges and features a smooth stroke for accurate position setting.

Installation & Operation:

• Regulation: Remove the ON/OFF cap and adjust using the provided key (attached to cap for sizes ≥ 1¼”). Fine-tune the flow rate via the graduated scale.
• Shut-off Functionality: The ON/OFF cap enables full closure of the valve regardless of preset regulation.
• Best Installation Practice: Use straight pipe sections (min. 5xDN upstream and 2xDN downstream) to ensure accurate flow measurement and stable performance.
• Actuator Compatibility: Supports retrofit of RWV Vaurien actuators without removing the valve from the line.

Certifications:

• AB1953 Lead-Free
• NSF/ANSI/CAN 61
• NSF/ANSI/CAN 372
• California Prop 65 Warning Compliant

Applications:

• Commercial and residential HVAC systems
• Terminal units like fan coil units and VAV boxes
• Hydronic heating and cooling loops
• Pressure-dependent systems requiring manual balancing

The 9527AB valve offers exceptional flow accuracy, ease of installation, and actuator readiness—all in a compact lead-free brass design. Whether you’re optimizing flow in a commercial build or fine-tuning residential hydronics, this terminal balancing valve ensures lasting performance and water safety compliance.

Dimension

Size	N	ΦC’ [m]	L² [m]	B [m]	HB [m]	HC [m]	ΦV [m]	I [m]	Valve Wt. [lb]	Act. Wt³ [lb]	Flow⁴ [GPM]
L½⁵	½-14	0.627 – 0.631	3.3 / 3.9	0.65 / 0.51	2.0	3.6/4.03	1.6	3.9	0.77 / 0.74	0.22 / 0.24	0.49 – 1.17
½⁶	½-14	0.627 – 0.631	3.3 / 3.9	0.65 / 0.51	2.0	3.6/4.03	1.6	3.9	0.77 / 0.74	0.22 / 0.24	0.98 – 2.35
½⁷	½-14	0.877 – 0.881	3.5 / 4.6	0.75 / 0.78	2.0	3.6/4.03	1.6	4.1	0.99 / 0.99	0.22 / 0.24	2.19 – 5.15
1⁴	1½-11.5	1.128 – 1.131	3.8 / 5.0	0.90 / 0.92	2.8	4.6	1.6	4.3	1.37 / 1.27	0.24	4.09 – 9.59
1½⁷	1½-11.5	–	4.3	0.91	4.7	5.9	1.8	4.5	2.1	0.6	8.56 – 19.81
1½⁸	1½-11.5	–	4.7	0.91	4.7	5.9	1.8	4.9	2.7	0.6	12.84 – 29.80
2⁹	2²-11.5	–	5.5	1.15	5.2	6.4	1.8	5.4	3.8	0.6	24.09 – 55.63

Size	Max Δp (psi) Vaurien 1	Max Δp (psi) Vaurien 2	Max Δp (psi) Vaurien 3
L ½\\”	51	65	–
½\\”	44	58	–
¾\\”	25	36	–
1\\”	–	25	–
1¼\\”	–	–	41
1½\\”	–	–	29
2\\”	–	–	19

Material

Part #	Component	Material	Specification
1	Plug	Lead free brass	ASTM B927 C27450
2	Body	Lead free brass	ASTM B927 C27450
3	Disc gasket	EPDM Perox	NSF Approved
4	Gasket washer	Lead free brass	DS-561 C28500
5	Balance disc	Lead free brass	C28000
6	Stem O-ring	EPDM Perox	NSF Approved
7	Spring cartridge	Brass	B124 C37700
8	Spring	Stainless steel	–
9	Disc stem	Stainless steel	–
10	Stop ring	Stainless steel	–
11	Washer	Brass	B124 C37700
12	Balancing stem	Lead free brass	DS-561 C28500
13	Bal. stem O-ring¹	EPDM Perox	NSF Approved
14	Bonnet O-ring	EPDM Perox	NSF Approved
15	Bonnet	Lead free brass	C28000
16	Graduated scale	Blue polypropylene	–
17	Reg. indicator	Orange polyamide	–
18	ON/OFF cap	Blue polyamide	–
19	Test point / plug	DZR brass²	–

Flow Measurement

Regulating Position	L-½\\”	½\\”	¾\\”	1\\”	1¼\\”	1½\\”	2\\”
0.5	0.127	0.578	0.798	1.538	2.324	2.486	4.416
1.0	0.173	0.879	1.237	2.405	4.058	4.451	6.960
1.5	0.220	1.098	1.584	3.121	5.376	6.474	9.283
2.0	0.254	1.260	1.896	3.665	6.081	7.757	10.47
2.5	0.289	1.399	2.197	4.162	6.844	8.682	11.91
3.0	0.335	1.514	2.451	4.509	7.561	9.677	12.95
3.5	0.382	1.607	2.671	4.844	8.116	10.47	14.22
4.0	0.428	1.699	2.856	5.226	8.786	11.46	15.49
4.5	0.486	1.769	3.017	5.491	9.191	12.14	16.53
5.0	0.543	1.838	3.179	5.723	9.896	12.95	17.69
5.5	0.601	1.884	3.306	5.942	10.27	13.41	18.61
6.0	0.659	1.931	3.422	6.127	10.96	13.99	19.42
6.5	0.717	1.965	3.526	6.312	11.45	14.34	20.23
7.0	0.775	2.000	3.619	6.555	12.14	14.80	21.04
7.5	0.832	2.035	3.700	6.740	12.60	15.26	21.85
8.0	0.879	2.058	3.792	6.937	12.95	15.72	22.66
8.5	0.925	2.081	3.873	7.087	13.30	16.07	23.47
9.0	0.960	2.104	3.942	7.145	13.76	16.76	24.16
9.5	0.994	2.116	4.012	7.283	14.34	17.34	24.97
10.0	–	–	–	–	–	–	25.55
10.5	–	–	–	–	–	–	26.24
11.0	–	–	–	–	–	–	26.59
11.5	–	–	–	–	–	–	27.17
12.0	–	–	–	–	–	–	27.40
12.5	–	–	–	–	–	–	27.86
13.0	–	–	–	–	–	–	28.09
13.5	–	–	–	–	–	–	28.79
14.0	–	–	–	–	–	–	29.13
14.5	–	–	–	–	–	–	29.83
15.0	–	–	–	–	–	–	30.17