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Indoor Fire Hydrant — Straight, Swivel, Pressure-Reducing & Stainless Steel Series | CA-FIRE
✓ GB 3445-2018✓ DN50 / DN65✓ 1.6 MPa✓ Straight · Swivel · Pressure-Reducing✓ Brass · Ductile Iron · Stainless Steel✓ Self-Rescue Hose Reel Option✓ ISO 9001 · GB · CE
CA-FIRE’s indoor fire hydrant series covers the complete range of GB 3445-2018 wall-mounted fire hydrant valves for building fire protection systems — from the basic straight-angle model through to pressure-reducing, swivel-outlet, self-rescue hose reel and stainless steel variants. Installed inside fire hydrant cabinets (消火栓箱) on every floor of commercial buildings, factories, schools, public facilities and vessels, the indoor fire hydrant is the first line of fire response for building occupants and arriving fire brigades in China’s built environment. The series is manufactured in brass (铜), ductile iron (铸铁) and stainless steel (不锈钢) body materials, covers DN50 and DN65 outlet sizes at 1.6 MPa working pressure, and includes straight-angle (直角型), swivel-outlet (旋转型), pressure-reducing (减压型 I/II/III), pressure-stabilising (减压稳压型), and self-rescue reel (自救盘管型 -Y) variants. All models are certified to GB 3445-2018 with ISO 9001, and are suitable for factories, government offices, schools, commercial premises and marine vessels.
Model Families — Select by Function
All models share GB 3445-2018 certification, DN65 outlet (DN50 on SN50), 1.6 MPa working pressure and KN65 hose coupling. The key differentiators are outlet geometry (straight vs swivel), pressure management function, body material and whether a self-rescue reel nozzle is incorporated. Use the table below to identify the correct variant for your project.
| Family / Code | Chinese Name | Description & Typical Application |
|---|---|---|
| SN65 / SN65-B / SN65-A | 直角型 | Straight-angle indoor hydrant. The baseline model — fixed 90° outlet, no pressure reduction, no swivel. SN65-B = ductile iron body, SN65-A = brass body. Used on standard building systems where supply pressure is within the normal range (0.35–0.7 MPa at the outlet). The most widely installed type in China for general-purpose commercial and industrial buildings. |
| SNZ65 / SNZ65-B / SNZ65-Y | 旋转型 | Swivel-outlet indoor hydrant. The outlet rotates 360° around the valve body, allowing the hose to be connected and directed in any orientation without twisting — especially important in tight cabinet spaces or where the cabinet is wall-mounted at an awkward angle relative to the fire location. SNZ65-Y = swivel type with self-rescue reel nozzle (19 mm small-bore hose on a reel for first-responder occupant use before the brigade arrives). |
| SNW65-I / II / III (+ -B, -A, -H, -Y variants) |
减压型 I / II / III | Pressure-reducing indoor hydrant — three grades. Incorporates an orifice pressure-reducing mechanism in the valve body. Grade I (减压I型): light pressure reduction — for zones where supply pressure slightly exceeds the design range. Grade II: medium reduction. Grade III: maximum reduction — for the lowest floors of high-rise buildings where the supply main delivers very high static pressure. -H suffix = includes an additional pressure-reducing orifice plate (孔板) for extra reduction. Essential per GB 50974 wherever calculated static pressure at the hydrant exceeds 1.0 MPa. |
| SNJ65 / SNZJ65 | 减压稳压型 | Pressure-stabilising indoor hydrant. More sophisticated than the SNW pressure-reducing series — incorporates a self-regulating pressure stabiliser that maintains consistent outlet pressure across the full flow range, compensating for both over-pressure (high static) and under-pressure (simultaneous operation drop) conditions. Straight (SNJ65) and swivel (SNZJ65) versions available. Specified for high-rise buildings with critical pressure management requirements or where multiple simultaneous hose operations must all deliver within the design pressure band. |
| SNZW65-I / II / III (+ -B, -H, -Y variants) |
旋转减压型 I / II / III | Swivel pressure-reducing hydrant — combines the 360° swivel outlet with the SNW pressure-reducing valve mechanism. The most versatile variant for high-rise buildings where both pressure management and installation flexibility are required. Available in all three reduction grades and with the -H orifice plate option. SNZW65-III-B (brass body swivel heavy-reduction) is the standard specification for the bottom floors of supertall towers in China. |
| SN65-Y / SNZ65-Y / SNW65-Y / SNZW65-Y series | 自救卷盘型 | Self-rescue hose reel variant (-Y suffix). Adds a 25 mm or 19 mm semi-rigid self-rescue hose on a wall-mounted reel to the standard fire hose outlet. The small-bore reel hose is for occupant first-response use — a non-trained building occupant can deploy and operate the reel hose alone before the fire brigade arrives, without needing to handle the heavier DN65 attack hose. Per GB 50067 and GB 50016, self-rescue reel variants are mandatory in public entertainment venues, hotels, shopping centres and high-occupancy buildings. |
| SNSSW65-I / SNSS65 | 不锈钢型 | Stainless steel body indoor hydrant. Full stainless steel body, spindle, gland and internal components — for installations in corrosive environments where standard brass or ductile iron would be subject to accelerated degradation: coastal buildings with high salt-air exposure, chemical plants, food processing facilities, pharmaceutical production, and any environment with aggressive atmospheric chemicals. SNSSW65-I = stainless steel swivel type with Grade-I pressure reduction. SNSS65 = stainless steel straight type. |
| SN50 | DN50型 | DN50 small-bore indoor hydrant. For low-hazard, low-occupancy buildings where GB 50016 permits the smaller DN50 hose reel system instead of the full DN65 attack line — typically single-occupancy commercial units, small warehouses and lightly occupied facilities where the primary user is a trained occupant rather than the fire brigade. |
Complete Model Reference
| Model Code | Type | Outlet | Body Material | Special Feature |
|---|---|---|---|---|
| SN65-B | Straight angle | DN65 | Ductile iron | Standard |
| SN65-A | Straight angle | DN65 | Brass | Brass body |
| SN50 | Straight angle | DN50 | Ductile iron | Small-bore DN50 |
| SNZ65 | Swivel 360° | DN65 | Ductile iron | 360° swivel outlet |
| SNZ65-B | Swivel 360° | DN65 | Ductile iron | Swivel, cabinet-mount |
| SNJ65 | Straight, pressure-stabilising | DN65 | Ductile iron | Pressure-stabilising (减压稳压) |
| SNZJ65 | Swivel, pressure-stabilising | DN65 | Ductile iron | Swivel + pressure-stabilising |
| SNW65-I / -I-B / -I-A | Straight, pressure-reducing Grd I | DN65 | Iron / Brass | PR Grade I · -I-A = brass |
| SNW65-II / -II-B | Straight, pressure-reducing Grd II | DN65 | Iron / Brass | PR Grade II |
| SNW65-III / -III-B / -III-H | Straight, pressure-reducing Grd III | DN65 | Iron / Brass | PR Grade III · -H = orifice plate |
| SNZW65-I / -I-B / -I-Y | Swivel, pressure-reducing Grd I | DN65 | Iron / Brass | Swivel + PR I · -Y = self-rescue reel |
| SNZW65-II / -II-B | Swivel, pressure-reducing Grd II | DN65 | Iron / Brass | Swivel + PR II |
| SNZW65-III / -III-B / -III-H / -III-Y | Swivel, pressure-reducing Grd III | DN65 | Iron / Brass | Swivel + PR III · -H = orifice plate |
| SNW65-I-Y / -III-Y / SNZW65-I-Y / -III-Y | PR + self-rescue reel | DN65 | Ductile iron | PR + 25 mm self-rescue reel nozzle |
| SNSSW65-I | Stainless steel swivel PR-I | DN65 | Stainless steel | Full SS316 for corrosive environments |
| SNSS65 | Stainless steel straight | DN65 | Stainless steel | Full SS316 straight type |
* -B = ductile iron cabinet model · -A = brass body · -H = with orifice plate for additional pressure reduction · -Y = with self-rescue 25 mm reel nozzle · SS = stainless steel body. Confirm specific suffix requirements at enquiry.
Common Technical Parameters
| Parameter | Specification |
|---|---|
| Compliance Standard | GB 3445-2018 (室内消火栓) · ISO 9001:2015 · CE |
| Rated Working Pressure | 1.6 MPa |
| Test Pressure | 2.4 MPa — hydrostatic, zero leakage |
| Outlet Size | DN65 (standard) · DN50 (SN50 model) |
| Hose Coupling | KN65 (65 mm Chinese standard fire hose coupling) |
| Inlet Connection | Internal thread Rp2½ (DN65) / Rp2 (DN50) — or flanged on request |
| Body Materials | Ductile iron (-B suffix) · Brass (-A suffix) · Stainless steel (SNSS/SNSSW series) |
| Valve Seals | EPDM (standard) · NBR or PTFE for special fluid service |
| Valve Operation | Handwheel — opens anti-clockwise. Slow-close design prevents water hammer on shut. |
| Self-Rescue Reel (-Y) | 25 mm semi-rigid hose on wall-mounted reel · 20–30 m length · 19 mm jet/spray nozzle |
| Finish — Iron/Brass Models | Red powder coat (RAL 3000) standard · Polished brass on -A models |
| Installation | Wall-mounted inside GB standard 消火栓箱 (fire hydrant cabinet) · Outlet centreline height 1.1 m AFF per GB 50974 |
| Warranty | 2 years |
Key Technical Features
|
⚖️ Three-Grade Pressure Reduction — SNW / SNZW Series GB 50974 mandates that the static pressure at any indoor fire hydrant outlet must not exceed 1.0 MPa, and the dynamic pressure during operation must not exceed 0.5 MPa. In multi-storey and high-rise buildings, the supply pressure at lower-floor hydrants far exceeds these limits — a 50-storey building with a gravity-fed roof tank delivers over 1.5 MPa at ground floor hydrants under static conditions. The SNW/SNZW three-grade pressure-reducing mechanism uses a precisely dimensioned orifice in the valve body to limit outlet pressure to the design value for each floor zone. Grade I covers moderate over-pressure; Grade II covers medium-rise buildings; Grade III (with optional -H orifice plate for additional reduction) covers the lowest floors of supertall towers where supply pressure is highest. Each grade is factory-calibrated to deliver outlet pressure within GB 50974’s 0.25–0.5 MPa usable operating range. Grade I / II / III · -H Orifice Plate · Factory Calibrated · GB 50974 |
🔄 360° Swivel Outlet — SNZ / SNZW Series A fixed-outlet hydrant (SN / SNW) requires the hose to be routed around the cabinet door in the single direction the outlet points — which may be directly toward the wall, requiring the hose to bend sharply and potentially kink at the coupling. In practice this slows deployment and increases the risk of a coupling-to-hose failure at a bend point under pressure. The SNZ/SNZW swivel outlet rotates 360° around the valve body axis — the hose coupling can be oriented to face directly into the room or corridor before the valve is opened, eliminating the hose-routing problem entirely. This is the recommended specification for all new-build projects per current GB 50974 design guidance, particularly in buildings where the fire hydrant cabinet is wall-recessed and the hose must exit horizontally into a corridor. 360° Rotation · No Hose Kink · Fast Deployment · Current GB Guidance |
|
🚿 Self-Rescue Reel — (-Y) Suffix Models The -Y self-rescue reel variant integrates a 25 mm semi-rigid hose on a spring-rewind wall reel alongside the standard DN65 attack hose outlet. The reel hose is designed for non-trained building occupants — the small bore, light weight and spring reel make it deployable by a single person in seconds, providing immediate suppression capability before the fire brigade arrives. Per GB 50067 (entertainment venues) and GB 50016 (building fire code), self-rescue hose reel systems are mandatory in hotels, shopping centres, public entertainment venues, hospitals and other high-occupancy public buildings. Specifying the -Y combined model instead of separate hydrant + reel units simplifies installation, reduces cabinet size requirements and eliminates the coordination risk of separate component supply. 25 mm Reel · Occupant Use · GB 50067 Mandatory · Hotels / Malls / Hospitals |
🔬 Stainless Steel Body — SNSS / SNSSW Series Standard ductile iron and brass body hydrants are suitable for the vast majority of indoor building environments. However, in atmospheres with high salt content (coastal buildings, marine vessels), chemical vapour exposure (industrial plants, chemical factories), or high humidity with corrosive airborne compounds (pharmaceutical production, food processing), the standard materials will exhibit accelerated surface corrosion, seal swelling and gland leakage within years rather than decades. The SNSS/SNSSW full stainless steel body (SS316 as standard, SS304 available) eliminates these failure modes. All external and internal wetted surfaces, the spindle, gland packing, handwheel and outlet coupling are manufactured in stainless steel — providing a service life of 25+ years in corrosive indoor environments where standard hydrants would require replacement within 5–8 years. SS316 Full Body · Coastal · Chemical Plant · Marine · 25+ Year Service Life |
Selection Guide — Which Model for Your Building?
| Building / Condition | Specify | Reason |
|---|---|---|
| Standard low-rise commercial or industrial building — supply pressure within 0.35–0.7 MPa at all floors | SNZ65 or SNZ65-B | Swivel outlet is the modern default for ease of deployment — no pressure reduction required where supply pressure is within the normal range |
| Mid-rise building (10–30 floors) — upper floors within range, lower floors slightly over 0.5 MPa dynamic pressure | SNZW65-I (upper floors) SNZW65-II or -III (lower floors) |
Zone the building by floor — match PR grade to calculated pressure at each zone. The fire system designer’s hydraulic calculations will specify which grade applies to each floor range |
| High-rise or supertall building — lowest floors under very high static pressure (> 1.0 MPa) | SNZW65-III-B or SNZW65-III-H | Maximum pressure reduction (Grade III) with optional orifice plate (-H) for additional reduction. Brass body (-B) for corrosion resistance in the building riser. Swivel for cabinet installation flexibility |
| Hotel, shopping centre, cinema, hospital or other public building — self-rescue reel mandatory | SNZW65-I-Y or SNZW65-III-Y (floor-dependent) | -Y self-rescue reel combined model satisfies GB 50067 / GB 50016 requirement in a single fitting. Select PR grade based on floor zone hydraulic calculations |
| Coastal building, marine vessel, chemical plant or pharmaceutical facility — corrosive atmosphere | SNSSW65-I or SNSS65 | Full SS316 body eliminates salt-air and chemical vapour corrosion. 25+ year service life vs 5–8 year replacement cycle for standard iron/brass in these environments |
| Heritage building, luxury hotel or high-specification interior — visible brass fitting preferred | SNW65-I-A or SNZW65-I-B (brass body) | Polished brass (-A) or brass body cabinet model (-B) provides premium aesthetic while maintaining full GB 3445-2018 compliance. Confirm finish option at enquiry |
Frequently Asked Questions
Applicable Standards & References
| Standard | Scope |
|---|---|
| GB 3445-2018 | 室内消火栓 — Indoor Fire Hydrants. The primary product standard for all CA-FIRE SN/SNW/SNZW/SNJ/SNSS series indoor hydrant valves. Specifies pressure ratings, outlet dimensions, materials, valve performance, endurance testing and marking requirements. Published by the Standardization Administration of China (SAC). Current edition 2018. |
| GB 50974 | 消防给水及消火栓系统技术规范 — Technical Code for Fire Water Supply and Fire Hydrant Systems. Governs complete indoor hydrant system design — spacing, layout, cabinet placement, pressure requirements (max 0.5 MPa dynamic), flow requirements, pipe sizing, pump selection and pressure zone design. The reference document for determining which pressure-reducing grade applies to each floor zone. |
| GB 50016 | 建筑设计防火规范 — Building Fire Safety Design Code. Contains building-type specific requirements for indoor fire hydrant provision including coverage requirements and self-rescue reel installation requirements in public-use buildings. |
| GB 50067 | 歌舞娱乐放映游艺场所设计防火规范 — Fire Safety Design Code for Entertainment Venues. Specifies the mandatory self-rescue hose reel requirement for hotels, cinemas, KTV venues, nightclubs and other public entertainment venues — the primary trigger for the -Y self-rescue reel variant. |
| ISO 9001:2015 | CA-FIRE quality management system certification — covers all indoor fire hydrant valve design, manufacturing, testing and supply chain operations. |
Applications
|
High-Rise & Super-High-Rise Buildings Office towers, residential high-rises, mixed-use skyscrapers. The most technically demanding application — requires precise pressure zoning across 30–100+ floors, with different PR grades assigned to each zone. SNZW65-I/II/III-B is the standard product family for China’s high-rise building stock. → SNZW65-I / II / III-B per floor zone |
Hotels, Shopping Centres & Hospitals High-occupancy public buildings where untrained occupants must be able to use the first-response hose system, and where GB 50067 / GB 50016 requires self-rescue reel capability. The -Y combined model on all floors satisfies both the brigade attack line and occupant reel requirement from a single cabinet position. → SNZW65-I-Y or SNZW65-III-Y |
Factories, Schools & Government Buildings Low-to-mid-rise buildings with standard supply pressure, no self-rescue reel requirement. The swivel type without pressure reduction is the default specification for the vast majority of China’s industrial and institutional building stock. SNZ65-B is the single most widely installed indoor hydrant model in China. → SNZ65-B standard |
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Marine Vessels & Offshore Cargo ships, passenger ferries, offshore platforms and port facilities — environments with persistent saltwater spray and humidity that will destroy standard iron/brass hydrants within a few years. Stainless steel SNSS/SNSSW series is the correct and only appropriate specification for marine applications. → SNSSW65-I or SNSS65 |
Chemical & Pharmaceutical Plants Production facilities with corrosive airborne chemical vapours — acid mists, solvent atmospheres, chlorine-containing environments. Stainless steel body prevents the external corrosion and gland degradation that would leave a standard hydrant inoperable within its required service life. SNSSW65-I with swivel outlet for installation flexibility. → SNSSW65-I |
Export — BRI & International Projects Buildings in Southeast Asia, Central Asia, Africa and the Middle East designed to GB standards by Chinese EPC contractors or consultants. CA-FIRE supplies the full indoor hydrant range to BRI construction projects. English-language certification documentation provided for project authority submission. → Per project fire engineer’s GB 50974 specification |
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Get a Quote — Indoor Fire Hydrant
GB 3445-2018 · DN65 / DN50 · 1.6 MPa · Straight · Swivel · Pressure-Reducing I/II/III
Self-Rescue Reel · Stainless Steel · Brass · Ductile Iron · Factory Direct
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