Overview: Siemens 243-00232
The Siemens 243-00232 is a factory-assembled 599 Series 3-way, 3/4 in. NPT zone valve (Cv 4.1, Kvs 3.5) with a Siemens SFP71U 24 VAC 2-position actuator. On power failure the fail-safe (SR) actuator returns the valve to its normal position, with flow AB to A.
The 3-way body is a diverting valve: as the stem moves down, flow through the NO port (AB-A) decreases and flow through the NC port (AB-B) increases. It may also serve as a mixing valve in limited applications.
Specifications verified against Siemens 599 Series Submittal Sheet 154-034 (February 1, 2023); Valve Body Technical Instructions 155-320P25 (December 8, 2022); Assembly Selection Technical Bulletin 155-291 (February 3, 2023). Last reviewed October 11, 2026.
Best For
- Hot or chilled water zone control: zones with radiators, floor heating by manifolds, fan coil units, induction units, cooling ceilings, wall-mounted boilers, VAV applications
- Two-position (open/closed) zone control
- Diverting service, and mixing service in limited applications
- Water and glycol solutions to 50%, 34 to 230 °F
Warranty
For Siemens warranty terms on this product, contact Team Zot at 855-825-2811 or sales@zotsupply.com.
Key Features
Factory Assembled
Valve body 599-00232 and the SFP71U actuator ship assembled under one product number.
Fail-Safe (SR) Return
On power failure the actuator returns the valve to its normal position: flow AB to A.
Tool-Free Mounting
Direct-coupled actuator hand-tightens onto the universal bonnet without tools, with manual override and visual position indication.
44 psi Close-Off
Maximum close-off pressure (AB-A) for this 3/4 in., Cv 4.1 body with the SFP71U.
ANSI Class III Leakage
Seat leakage rate ANSI Class III (AB-A) with the SFP71U.
Brass Body, Stainless Stem
Brass body and trim, Type 303 stainless steel stem, ethylene propylene O-ring packing.
ZOT Supply is an authorized distributor of Siemens products.
Technical Specifications
Valve Body
| Valve body part number | 599-00232 |
|---|---|
| Valve pattern | 3-way diverting (mixing in limited applications) |
| Action | Fail AB to A, fail-safe (SR) |
| Line size | 3/4 in. (20 mm) |
| End connection | NPT threaded |
| Flow coefficient (Cv) | 4.1 (AB to A) |
| Kvs | 3.5 |
| Flow characteristic | Linear |
| Body style | Globe |
| Seat style | Metal-to-metal |
| Bonnet | Direct-coupled, universal bonnet |
| Stem travel (stroke) | 1/10 in. (2.5 mm) |
| Valve body rating | ANSI Class 125 (PN 16) |
| Body / trim material | Brass / Brass |
| Stem material | Stainless steel ASTM A582 Type 303 |
| Packing | Ethylene propylene O-ring |
| Controlled medium | Water, glycol solutions to 50% |
| Medium temperature range | 34 to 230 °F (1 to 110 °C) |
| Maximum inlet pressure | 232 psig |
| Maximum close-off pressure (AB-A) | 44 psi with SFP71U |
| Close-off rating standard | According to ANSI/FCI 70-2 |
| Leakage rate | ANSI Class III (AB-A) |
| Valve body weight | 1.07 lb (0.49 kg) |
| Service kit | 599-00599 AL50 zone valve support rings, 10 pack |
Actuator: SFP71U
| Actuator model | SFP71U |
|---|---|
| Control signal | 2-Position |
| Operating voltage | 24 Vac ±20% |
| Power consumption | 9.8 VA |
| Frequency | 50/60 Hz |
| Power-failure action | Fail-safe (SR): returns to normal position |
| Agency certification | UL listed to UL873; cUL certified to Canadian Standard C22.2 No. 24-93 |
| Mounting location | NEMA 1 (interior only) |
| Actuator weight | 1.18 lb (0.54 kg) |
| Actuator dimensions | 3.4 H x 4.4 W x 2.3 D in. (85 x 111 x 58 mm) |
Assembly Dimensions and Service Envelope
| Valve centerline to top of actuator (H1) | 4.38 in. (112 mm) |
|---|---|
| Service height (H) | 12.38 in. (315 mm) |
| Width or diameter of actuator (W1) | 4.38 in. (112 mm) |
| Service width (W) | 12.38 in. (315 mm) |
Valve Body Dimensions
| Overall length (A) | 2.76 in. (70 mm) |
|---|---|
| Overall height (B) | 2.34 in. (59.5 mm) |
| Pipe centerline to top of body (C) | 0.96 in. (24.5 mm) |
| Installation | Flow in direction of body arrow; actuator above valve body preferred; any position from vertical to horizontal, not below horizontal or upside down |
Documentation
Frequently Asked Questions
What is the Cv of the Siemens 243-00232?
The 243-00232 has a Cv of 4.1 (Kvs 3.5) on the AB to A path in a 3/4 in. NPT 3-way 599 body with a linear flow characteristic.
Which port does the Siemens 243-00232 fail to?
On power failure the SFP71U fail-safe (SR) actuator returns the valve to its normal position, with flow AB to A.
What power and control signal does the Siemens 243-00232 use?
The SFP71U runs on 24 Vac ±20%, 50/60 Hz, draws 9.8 VA, and accepts a 2-position control signal.
What is the close-off pressure of the Siemens 243-00232?
44 psi maximum close-off (AB-A), rated according to ANSI/FCI 70-2, with leakage rate ANSI Class III (AB-A).
Can the Siemens 243-00232 be used as a mixing valve?
The 599 3-way body is a diverting valve. It may be used for mixing in limited applications: mounted in the return flow and within the allowable differential pressure for the system pressure shown in the 599 Technical Instructions.
How should the Siemens 243-00232 be installed?
Install so flow follows the arrow on the valve body. For best performance mount the actuator above the valve body; any position between vertical and horizontal is acceptable, but not below horizontal or upside down.
What media and temperatures is the Siemens 243-00232 rated for?
Water and glycol solutions to 50%, medium temperature 34 to 230 °F (1 to 110 °C), maximum inlet pressure 232 psig.
- Valve Pattern:
- 3-Way
- Valve Size:
- 3/4 Inch
- Connection Type:
- NPT
- CV Rating:
- 4.1
- Max Close-Off Pressure:
- 44 psi
- Medium Temperature Range:
- 34-230 °F
- Body Material:
- Brass
- Actuator Type:
- Fail-Safe
- Fail-Safe Position:
- Fail AB to A
- Voltage:
- 24VAC
- Control Signal:
- On/Off
- Auxillary Switch:
- None
