Grooved Deluge Valve — ZSFM-G Series, Ductile Iron (DN80–DN200)

CA-FIRE's grooved deluge valve (Model ZSFM-G) is a diaphragm-type deluge valve with Victaulic-compatible grooved mechanical coupling connections — replacing the 8–16 bolt flanged joint with a two-bolt clamp assembly that positions and seals in minutes without pipe alignment tooling or sequential bolt torquing. The operating principle is identical to a flanged deluge valve: EPDM diaphragm held closed by control-chamber pressure in standby; fire signal vents control chamber; supply pressure opens diaphragm in ≤ 2 seconds; all open nozzles discharge simultaneously. Available in DN80, DN100, DN150, and DN200, rated 1.6 MPa. For DN50–DN350 in flanged connection, see the flanged diaphragm deluge valve.

This is the standard specification for grooved-pipe deluge systems — warehouses, shopping centres, airports, and industrial plants where the complete pipework system uses grooved mechanical couplings. Specifying a flanged valve into a grooved system forces a transition fitting at every valve station; the ZSFM-G eliminates this entirely. For the complete deluge valve range, see the CA-FIRE series overview.

① Standby — Diaphragm Held Closed

Water pressure from the supply side fills the control chamber above the EPDM diaphragm via the priming restriction. The control-chamber pressure acts on the larger upper face of the diaphragm, producing a net downward closing force that holds the diaphragm against the valve seat — sealing the downstream grooved distribution header with leakage ≤ 0.1 L/min. Grooved couplings at inlet and outlet maintain flexible, leak-free connections to the supply and distribution headers. All downstream open nozzles are dry at atmospheric pressure.

② Detection → Control Chamber Vents

A fire detector signals the fire alarm panel, which energises the DC24V trim solenoid (or pilot line pressure drops via pneumatic detection, or operator presses manual release). The solenoid opens the vent port on the control chamber, allowing control-chamber water to drain rapidly to atmosphere. Control-chamber pressure drops to near-zero within fractions of a second — removing the closing force on the upper diaphragm face entirely.

③ Diaphragm Opens — Zone Discharges

With control pressure removed, supply pressure (up to 1.6 MPa) acting on the lower diaphragm face lifts the diaphragm fully into the bonnet cavity within ≤ 2 seconds. The complete bore is exposed — hydraulic resistance drops to <0.08 MPa. Water fills the grooved distribution header at full flow and discharges simultaneously from every open nozzle across the entire protected zone. Water motor gong activates hydraulically; alarm pressure switch sends confirmation signal to fire panel. No sequential zone delay.

④ Reset — No Tools Required

After fire suppression and approval to reset: (1) close upstream isolation valve; (2) de-energise solenoid or re-pressurise pilot line; (3) open priming valve — control chamber refills from supply side; (4) diaphragm reseats under control-chamber pressure within 30–60 seconds; (5) confirm seal — check drain for zero flow; (6) drain downstream grooved distribution pipework via drain valve; (7) restore detection circuit; (8) reopen upstream isolation valve to return to standby. Total reset time: 15–30 minutes. No tools required. Grooved coupling integrity: inspect coupling bolt torque at each reset as part of the inspection routine — retighten to manufacturer specification if any movement is noted.

Warehouses & Logistics Centres

Grooved-pipe systems are the standard construction method in large-footprint warehouse buildings — fast installation across large floor areas, easy modification for racking layout changes, and simple zone addition as the facility expands. The ZSFM-G grooved deluge valve integrates directly into these systems at the valve station without transition fittings. For high-rack warehouses with ESFR sprinklers, the grooved deluge valve serves as the zone control valve on deluge suppression zones.

Shopping Centres & Retail Buildings

Multi-zone deluge systems covering large open-plan floor plates in shopping centres, department stores, and hypermarkets. Grooved pipework is widely used in retail construction for installation speed and architectural flexibility. The ZSFM-G extends this consistency to the valve station level — no transition fittings, no flange gasket inventory, consistent connection standard throughout the building's fire suppression infrastructure.

Airports & Transport Infrastructure

Complex multi-zone suppression systems in large public assembly buildings where programme time pressure makes grooved installation the preferred method and schedule driver. Airport terminal buildings also have significant structural movement from thermal expansion, live loads, and vibration from aircraft and ground vehicles — grooved couplings absorb this passively at every joint, eliminating the need for dedicated expansion joints that flanged systems require.

Power Stations & Industrial Plants

Transformer protection, cable tunnel suppression, and turbine hall deluge systems where grooved pipework runs alongside other mechanical services in plant rooms with significant vibration from rotating machinery. The coupling's vibration absorption is directly relevant — it prevents fatigue cracking at threaded or welded pipe joints that rigid systems accumulate over years of continuous vibration. Cable tunnel installations also benefit from the grooved system's ease of modification when cable routes change.

Retrofit — Extending Existing Grooved Systems

When an existing wet-pipe or dry-pipe grooved sprinkler system is being extended to add deluge zones — for a new building wing, a change of occupancy, or an upgrade to water spray protection in a transformer area — the ZSFM-G grooved deluge valve connects directly to existing grooved headers. No transition flanges, no bore-step connections between grooved and flanged pipe runs, no additional pressure loss at the transition. The existing grooved system infrastructure is fully reused.

Seismic Zones & High-Vibration Environments

In seismic zones or industrial environments with significant mechanical vibration, grooved mechanical couplings provide inherent flexibility at every pipe joint — absorbing small differential movements that rigid flanged systems transmit as stress concentrations. Many seismic design codes explicitly recognise grooved couplings as a flexible connection type, potentially reducing the number of dedicated seismic sway braces required. For buildings in seismic risk zones, consult the NFPA 13 seismic provisions for grooved coupling requirements.

Flanged · DN50–DN350 · Cast Iron

Diaphragm Deluge Valve

The flanged-connection equivalent — DN50 to DN350, cast iron body, flanged ends. For flanged infrastructure, sizes outside DN80–DN200, or where grooved connections are not specified.

Grooved · Wet-Pipe · Alarm Check

Grooved Alarm Valve

The grooved-end alarm check valve for wet-pipe sprinkler systems — pairs with the ZSFM-G in mixed wet/deluge grooved systems to maintain consistent connection standards throughout the building.

Ex-Rated · Zone 1/2 · Flanged

Explosion-Proof Deluge Valve

When Ex db IIC T6 Gb certification is required for Zone 1/2 hazardous areas — 1.6 MPa or 2.5 MPa, flanged, DN50–DN300. The correct specification when the ZSFM-G is unsuitable due to Ex requirements.

Pipeline Filtration · Grooved End

Grooved Y Strainer

Grooved-end Y-type strainer for protecting the ZSFM-G trim circuit from debris in the supply line — maintains consistent grooved coupling standard throughout the valve station pipework.