Weflo Fig. 4102 Flanged Ductile Iron Ball Valve

Overview

The Weflo Fig. 4102 is a flanged ductile iron ball valve with a PTFE seat and a stainless steel ball, intended for quarter-turn isolation in water, chilled water and general service pipework. Weflo builds the Weflo Fig. 4102 to comply with MSS SP-72, highlights its low operating torque, and provides an actuator-ready top flange in accordance with ISO 5211-1, so the same valve can be lever operated on day one and automated later. The valve is offered from DN15 to DN200 with flanges drilled to EN 1092-2 PN16 as standard and a rated working pressure of 16 bar (250 psi).

Seven Star LLC supplies the Weflo Fig. 4102 to contractors, maintenance departments and OEM skid builders in Oman and the GCC, with engineering support in Muscat. For buyers searching for a valves supplier in Oman that can provide flanged ball valves for chilled water and building services, the Weflo Fig. 4102 offers a compact, full-flanged alternative to threaded brass valves on small and medium bore lines.

Operating Principle

A ball valve uses a sphere with a through-bore that rotates through ninety degrees inside the body. When the bore lines up with the pipe the valve is open and the flow path is almost unobstructed; when the ball is turned a quarter turn, its solid side faces the flow and the valve is closed. The seal is made between the polished ball and two seat rings, which in the Weflo Fig. 4102 are PTFE, a material chosen for its low friction and broad chemical resistance.

Because the ball wipes across the seats every time it is operated, ball valves of this type tend to stay free-moving even after long periods in one position, which suits isolation points that are rarely used. As general engineering guidance, a standard ball valve is an on-off device; throttling with the ball partly open concentrates velocity on the edge of the seats and can damage them, so regulation duties are better served by globe-pattern balancing valves or control valves.

Engineering Design of the Weflo Fig. 4102

The body of the Weflo Fig. 4102 is ductile iron to EN 1563 EN-GJS-450-10 (ASTM A536 Grade 65-45-12), and the ball is stainless steel to EN 10213 GX5CrNi19-10 (ASTM A351 Grade CF8). Stem, bushing, stem nut and stopper are stainless steel X5CrNi18-10 (ASTM A276 Type 304), the body seat is PTFE, the O-ring is rubber, and the handle is carbon steel. Corrosion protection is fusion bonded coating or liquid epoxy painting on the interior and exterior, and Weflo notes that other material types are available on request.

The body is a flanged, two-piece pattern, as the published schematic shows, with face-to-face lengths from 115 mm at DN15 to 400 mm at DN200 and heights from 83 mm to 325 mm. The ISO 5211-1 top flange means that a pneumatic or electric actuator can be mounted directly once the handle is removed, which is useful where the Weflo Fig. 4102 will be integrated into a building management system or a process control loop.

Key Features

The Weflo Fig. 4102 datasheet highlights the following features.

• The valve complies with MSS SP-72 for ball valves with flanged ends.
• Low operating torque makes manual operation easy and reduces actuator size when automated.
• The top flange is actuator-ready in accordance with ISO 5211-1.
• Flanges and drilling comply with EN 1092-2 PN16, with other flange types available on request.
• The rated working pressure is 16 bar / 250 psi.
• A stainless steel CF8 ball runs against PTFE seats for reliable shut-off.
• The stem, bushing and stem nut are 304 stainless steel for corrosion resistance.
• Fusion bonded coating or liquid epoxy paint protects the ductile iron body inside and out.

Industrial Applications

Flanged ball valves such as the Weflo Fig. 4102 are widely used for isolation of fan coil and air handling unit groups, drain and vent branches, make-up water lines, chemical dosing pots, filtration skids and small pump sets. In the hot climate of Oman and the GCC, where chilled water and cooling tower systems operate almost continuously, a reliable quarter-turn isolation valve on each branch makes routine maintenance quicker and reduces the volume of water that must be drained.

Seven Star LLC supplies the Weflo Fig. 4102 for HVAC, water treatment and light industrial projects in Muscat, Sohar, Salalah and the wider region, and can advise on actuation where automated isolation is required. Typical related equipment includes damper and valve actuation from the Belimo LF24-SR spring-return actuator, pumps such as the Grundfos CR vertical multistage pump, and resilient-seated isolation on larger lines with the KITZ DJ-Series butterfly valve.

Technical Specifications

Weflo Fig. 4102 data below is taken from the Weflo datasheet; dimensions are in millimetres.

Selection and Installation Notes

The following points are general engineering guidance rather than Weflo instructions. Check that the PN16 drilling of the valve matches the mating flanges, particularly on projects where ANSI Class 150 or Class 125 flanges are used on imported equipment. Allow clearance for the full swing of the lever handle, and if the valve is to be actuated, select the actuator for the breakaway torque of the size concerned with an appropriate safety margin.

PTFE seats are best suited to clean liquids; where the line carries abrasive solids, a strainer upstream will extend seat life. The Weflo Fig. 4102 datasheet does not show a drinking-water approval, so projects that require WRAS or NSF 61 documentation should discuss alternatives with Seven Star LLC before ordering.

How to Order

To request a quotation for the Weflo Fig. 4102, send Seven Star LLC an RFQ with sizes, quantities, flange standard and whether actuation is required. Our Muscat team can confirm availability and lead time, provide the Weflo technical datasheet available for download on this page, and support HVAC and water projects across Oman and the GCC.