Stealth Valve
Conbraco
All bodies shall be cast Ductile Iron 65-45-12 or fabricated Carbon steel. MTR's shall be submitted at time of shipment. All bodies shall be epoxy coated internally and externally per the paint specification as indicated. All bodies shall incorporate identification plates in Brass or stainless steel indicating the maximum pressure, temperature, date of manufacture, and SO number for full traceability.
All bodies shall incorporate lifting lugs for vertical and horizontal lift. The lifting lugs shall not penetrate the diameter or radius of the valve body. All lifting ears shall be cast in the body. Cast mounting ears for actuators is unacceptable. All mounting pad surfaces shall incorporate a machined or milled surface to ensure mounting concentricity.
All bodies shall incorporate 316 stainless steel packing and seal body journals. Bodies shall be available in wafer, lug and full-flanged configurations.
Fixed Discs :
All fixed discs shall incorporate a dielectric link between the body and disc to prevent corrosion. All fixed discs shall be recessed in the body and supported by the disc step in the body and downstream flange. All discs shall be capable of horizontal mounting when specified and incorporate non-corrosive dowels to prevent rotation allowing for field disassembly when required. All discs shall be designed with zero deflection under maximum pressure. The fixed disc shall be 420 stainless steel with a Rockwell of 45-55. The fixed disc shall incorporate an asymmetric located groove to ensure accurate placement of the holes relative to the linear disc and dual shafts. All discs shall be surface ground for the mating linear disc with tolerances not exceeding three thousands of an inch. Fixed discs shall incorporate lifting holes to permit field disassembly and assembly.
Linear Discs :
All discs shall be surface ground for the mating fixed disc with tolerances not exceeding three thousands of an inch. All linear discs shall incorporate a T shaft connection designed with zero tensile deflection for lift or thrust under full pressure. All lower shaft bores shall incorporate non-metallic non-corrosive bearings the full length of the bore for shaft engagement. All linear discs shall incorporate the anti-hydraulic lift mechanism in the lower shaft. All discs shall be capable of horizontal mounting when specified with Lower T shafts. The disc or body shall incorporate non- corrosive, non-metallic guides to support the disc in the horizontal position when required. The disc shall be 420 stainless steel with a Rockwell of 45-55. Linear discs shall incorporate lifting holes to permit field disassembly and assembly. All linear discs shall operate within a machined groove in the body and travel in the fully open and closed position aligning with all holes in the fixed disc. The disc shall not contact the upstream side of the body groove. All linear discs shall incorporate a taper ring incorporating a non-corrosive non-metallic friction plate and capable of intermittent bi-directional flow.
Shafts:
All shafts shall be of solid one-piece construction. Material shall be 316 stainless Steel ground and polished. Lower shafts shall incorporate milled grooves to prevent hydraulic lift of the disc.
Lower Shafts:
All lower shafts shall be ground and milled incorporating an O-Ring seal with a solid thrust hub bolted to the body of the valve. All lower shafts shall incorporate an outer thrust Cap with an O-Ring and seals capable of field replacement without shaft removal or depressurizing the piping system. The lower cap seal and O-Ring shall be field replaceable under flowing conditions without taking the valve out of service.
Upper Packing & Seals:
All upper shaft packing shall be chevron housed in a 316 stainless steel chevron body journal. The chevron shall be retained by a floating internal C-Clip and live loaded by a floating ring and upper seal bearing. The O-Ring seals shall be housed in a non-metallic non-corrosive bearing. The bearing shall house two dynamic and two static O-Ring seals. Both static O-rings shall be in full contact with the 316 stainless steel journal housing. The bearing and O-Rings shall be field replaceable under flowing conditions without valve removal or system depressurization. The upper bearing will also live load the packing under normal operational conditions and be retained by a 316 stainless steel bearing cap.
Indication:
All valves shall have manual visual indication on the mounting housing for the actuator. A scale shall be provided for 10 percent increments from the fully open and closed position. The indicator shall be adjustable for re calibration should the valve be field adjusted.
Shaft Adjustment :
The valve shaft shall be full adjustable with a actuator or shaft extension coupling. The coupling shall incorporate an indicator that will operate in any orientation and be tamper proof.
All removable components and hardware shall be 316 stainless steel.
All valves shall be manufactured in Canada. Patent designs will be considered and infringements on designs will not be accepted. All valves shall be manufactured by Stealth International Inc, or reviewed equivalent.
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