RF Valves

Air-actuated pinch valve, double or single acting, fail open or fail closed, working pressure to 300 psi (20 bar) with higher on consultation, minus 50 to 250 deg F, ductile iron (CRN available) or aluminium body, enclosed or sealed. The actuator is described as receptive of positioners from leading manufacturers.

Use it whenthe default choice for automated slurry service. Use it when the valve has to cycle regularly or modulate on a control signal and there is plant air available. Because it takes third-party positioners, it fits into an existing instrument standard.

Hand-operated version with a sealed and lubricated closing mechanism, self-lubricating handwheel with or without gear reducer, to 300 psi (20 bar).

Use it whenuse it for isolation duty that gets operated occasionally - drain points, sample lines, maintenance isolation on a slurry header. The sealed and lubricated mechanism is the point: exposed screw threads on a slurry duty seize.

Configurable with most electric multi-turn actuators on the market, 120 V, 240 V, 360 V or 480 V, with or without handwheel override, to 300 psi (20 bar).

Use it whenuse it where there is no reliable plant air at the valve - remote thickener, tailings or reagent locations. Slower than pneumatic, so not for fast-acting duty.

Hydraulically actuated, and per the site the actuator is two thirds smaller than other actuators, to 300 psi (20 bar).

Use it whenuse it when the installation is physically tight or when the plant already runs hydraulics - the compact actuator is the stated reason to pick it over pneumatic.

The low-pressure, lower-cost pinch valve brand. 1 in. to 60 in., working pressure to 60 psi (4 bar), minus 50 to 250 deg F, plant-air actuated, sealed body in ductile iron, aluminium or stainless on request, fusion bonded epoxy powder coat inside and out. Non-stretch design; the site claims 2 to 3 times the elastomer tube life of conventional air-actuated pinch valves.

Use it whenuse it when the pressure is genuinely low - 60 psi is the ceiling - and the job is price-sensitive: powders, dry bulk, gravity-fed and low-head liquid and slurry lines. Do not substitute it for an RF VALVE pinch valve on a 150 psi header; the pressure rating is the whole difference.

Flanged body, 3 in. to 26 in. (80 mm to 650 mm), sleeves with a J-ring stiffener to hold sleeve shape and resist wear. Yoke design keeps slurry splatter off and takes proximity or limit switches.

Use it whenuse the flanged version when the valve has to be independently removable, when the line is a stub or end-of-line, or when a wafer valve would leave you having to spread the pipe. Also the choice above 24 in. since the wafer stops there.

Wafer body, 2 in. to 24 in. (to 600 mm), embedded sleeve stiffener ring and a 360-degree groove along the inner sleeve surface for axial flexibility. To 150 psi with higher on consultation.

Use it whenthe usual choice between two flanges on a slurry header: shorter, lighter and cheaper than flanged, and the axial flexibility groove helps where the pipe moves. Use flanged instead if the valve has to come out on its own.

Lightweight sealed design, 2 in. to 24 in., 150 psi CWP (10 bar) across all sizes, mechanically retained moulded body seal, NBR or PTFE seal, 304L or 316L blade. Available fusion bonded epoxy (FBE) or soft rubber lined (SRL).

Use it whenthe general-purpose sealed knife gate. Use it where you want bi-directional leak-proof shutoff at 150 psi and weight or price matters. Ask for SRL when the media is abrasive and FBE when it is chemically aggressive.

Higher-pressure sealed design, 2 in. to 24 in., 230 psi CWP (16 bar) across all sizes, combination transverse seal with adjustable stuffing box and gland. FBE or SRL.

Use it whenstep up to MH when the line pressure is above 150 psi - the 230 psi rating and the adjustable gland are the reasons. The adjustable stuffing box also means the stem seal can be taken up in service rather than replaced.

Ported blade, pass-through design with a standard catch chamber, 3 in. to 24 in., to 200 psi (14 bar) depending on size, field-replaceable heavy-duty elastomer sleeves with the ported blade in contact with sleeves on both sides. Suitable for wet or dry service.

Use it whenuse the ported blade when the media would pack a seat cavity or when the service is dry bulk as well as wet - the blade stays in contact with the sleeves on both sides so there is nowhere for solids to build and hold the gate open. Also the pick where carryover past the gate into the surroundings is unacceptable, because of the catch chamber.

The large-bore sealed design, 28 in. to 48 in. (DN700 to DN1200), to 200 psi (14 bar) depending on size, mechanically retained extruded body seal, combination transverse seal with adjustable stuffing box and gland. FBE or SRL.

Use it whenuse it when the line is larger than 24 in. - thickener underflow, large tailings and coarse slurry headers. This is a size continuation of LW and MH, not a different performance class.