SAFEMATIC SWE-GLD Stainless Steel Seal Water Management Flow Meter with Control Valve

Our brand delivers complete technical solutions within the fluid machinery and engineering sectors. Through our range of specialized technologies and product brands, we equip our clients with high-level technical advisory, commercial support, and integrated product solutions — covering pumps, frequency converters, servo drives, PLC-HMI, industrial control cabinets, motors, mechanical seals and assemblies, couplings, gearboxes, and turnkey engineering services (overseas on-site 3D scanning reverse molding of pump replacement parts and equipment debugging by our engineers deployed overseas).

John Crane Dual Mechanical Seal Water Station (also referred to as a dual seal support system or pressurized barrier fluid unit) is a closed-loop pressurized fluid supply system designed to provide clean, cool barrier fluid under positive pressure to a dual mechanical seal arrangement in a pump. Unlike a single seal water station, a dual seal system maintains barrier fluid pressure above the pump process fluid pressure, ensuring that any leakage across the inboard seal face is barrier fluid entering the process, not process fluid escaping to the environment.

The dual seal water station is a complete skid-mounted assembly consisting of a pressurized reservoir (accumulator-type or bladder-type), a circulation pump (for forced-loop systems), pressure regulation and relief components, cooling heat exchanger, instrumentation panel, and interconnecting piping. It operates as a closed loop: barrier fluid is pressurized by an external nitrogen source or a small dedicated pump, circulated through the dual seal chamber, cooled in the heat exchanger, filtered, and returned to the reservoir for re-pressurization.

Dual seal support systems are specified for applications where zero process fluid leakage to the environment is mandated — toxic, flammable, corrosive, or environmentally hazardous fluids. John Crane API Plan 53A, 53B, 53C, and 54 piping plans are the industry-standard configurations for dual pressurized seal support systems. Our John Crane specification dual seal water stations are manufactured to match John Crane original dimensions, pressure ratings, and piping plan configurations for direct retrofit or new installation.

• API Plan Compliance — Configurable to API 53A, 53B, 53C, or 54; all pressure-containing components rated to the specified plan and seal chamber pressure requirements
• Pressure > Process Design — Barrier fluid pressure maintained 1–3 bar above pump process pressure at all operating conditions, ensuring the primary seal always leaks barrier fluid inward, never process fluid outward
• Redundant Safety Features — Dual relief valves, low-pressure alarm, high-temperature alarm, and low-reservoir level shut-down contacts as standard safety package
• Heat Removal Capacity — Heat exchanger sized per John Crane seal heat generation curves; typical cooling capacity sufficient to maintain barrier fluid temperature at 15–25°C above cooling water inlet
• Turnkey Assembly — Fully assembled, pressure-tested, and factory-calibrated before shipping; includes all interconnecting hoses, fittings, and installation brackets