Proco - Model Style 242 - Molded Double-Sphere Rubber Expansion Joint
Proco Series 242 expansion joints are molded double-sphere arch expansion joints which are built to withstand even the most rigorous piping system configurations. They allow for axial compression or axial extension, and lateral deflection as well as angular movement. Their easy installation makes them the logical choice for even the toughest jobs.
Some of the notable features and benefits of the Proco Series 242 are:
- Absorption of Directional Movement
- Easy Installation with Rotating Metallic Flanges
- Wide Range of Flange Materials Available
- Absorption of Vibration, Noise and Shock
- Wide Range of Service and Lighter Weight
- Easy Material Identification
Absorbs Directional Movement
Thermal movements appear in any rigid pipe system due to temperature changes. The Style 242 spherical arch expansion joints allow for axial compression or axial extension, lateral deflection as well as angular movement. (Note: Rated movements in this publication are based on single plane movements. Multiple movement conditions are based on a multiple movement calculation. Contact Proco for information when designing multiple pipe movements.)
Easy Installation with Rotating Metallic Flanges
The floating metallic flanges freely rotate on the bellows, compensating for mating flange misalignment, thus speeding up installation time. Gaskets are not required with the Style 242, provided the expansion joints are mated against a flat face flange as required in the installation instructions.
The Proco Style 242 molded expansion joints are furnished complete with plated carbon steel flanges for corrosion protection. 304 or 316 stainless steel flanges are available upon request as well as ANSI 250/300 lb., BS-10, DIN PN10 & PN16 and JIS-10K drilling.
Absorbs Vibration, Noise and Shock
The Proco Style 242 molded expansion joints effectively dampen and insulate downstream piping against the transmission of noise and vibration generated by mechanical equipment. Noise and vibration caused by equipment can cause stress in pipe, pipe guides, anchors and other equipment downstream. Water hammer and pumping impulses can also cause strain, stress or shock to a piping system. Install the Style 242 molded expansion joints to help compensate for these system pressure spikes
Wide Service Range with Low Cost
Engineered to operate up to 300 PSIG or 265°F, the Proco Style 242 can be specified for a wide range of piping requirements.
Compared to conventional hand-built spool type joints, you will invest less money when specifying the mass-produced, consistent high quality, molded single or twin sphere expansion joints.
- All Style 242 molded expansion joints have branded elastomer designations.
- Neoprene Tube/Neoprene Cover (NN) and Nitrile Tube/Neoprene Cover (NP) elastomer designated joints meet the Coast Guard Requirements and conform to ASTM F1123-87. 240C/NP-9 joints have ABS certification.
Proco Products, Inc. maintains one of the largest inventories of rubber expansion joints in the world. Please contact us for price and availability.
All Products are reinforced with Nylon Tire Cord, except 240-A and 240-C which are reinforced with Polyester.
- All NN & NP elastomer designated joints meet the Coast Guard Requirements and conform to ASTM F 1123-87 and are marked accordingly.
- Branding Label will be marked as “Food Grade”.
- BB, EE, or EE-9 are good for 300°F blower service at 20 PSI or less.
- 240-A & 240-C expansion joints have black EPDM tube, but are FDA compliant.
- EE-9 joints are peroxide cured.
- NP-9 joints have ABS certification.
- Elastomers are in accordance with NSF/ANSI 372, File MH47689 Und. Lab. Classified.
- All elastomers above are not intended for steam service.
- For PTFE lined single sphere see www.www.procoproducts.com/ptfelined.html
- For 240A & 240C Rubber Joints, Vacuum Support devices are available. Published movements will be reduced by approximately 50% for this option.
- Series 240AV,D,E&M + 242A,B&C In Elastomers EPDM & Neoprene are all listed for lead content in accordance with NSF/ANSI 372
A control rod unit consists of limit rods, tie rods, or compression sleeves, and a control unit assembly is a system of two or more control rod units placed across an expansion joint from flange to flange. Their purpose is to minimize possible damage caused by possible excessive motion of a pipeline. Control unit assemblies can be set at the maximum allowable expansion and / or contraction of the rubber expansion joint.
When used properly, control unit assemblies serve as additional safety enhancements, and can minimize possible damage due to adjacent equipment.
Rubber expansion joints should be installed between two fixed anchor points in a piping system. When proper anchoring can’t be provided, control units are required. When an un-anchored piping system is encountered, nuts should be tightened securely against the rod plate, to prevent over-extension due to pressure thrust caused by the expansion joint.
Listed below are three control unit configurations supplied by Proco, that are commonly used with rubber expansion joints in piping systems.
- Figure 1: Limit Rod. A limit rod control unit configuration will allow an expansion joint to lengthen to a predetermined extension setting. Spherical washers can also be furnished, upon request, to prevent any “nut to plate” binding during offset.
- Figure 2: Limit / Control Rod. This type of configuration is used to allow specified pipe expansion (expansion joint axial compression) and pipe contraction (expansion joint axial extension) movements. Spherical washers can also be furnished, upon request, to prevent any “nut to plate” binding during offset.
- Figure 3: Compression Sleeve. A compression sleeve configuration is used to allow for specified pipe expansion (expansion joint axial compression) and pipe contraction (expansion joint extension) movements. Proco will supply each compression sleeve equipped to prevent any axial movement, unless otherwise specified at the time of purchase. Spherical washers can also be furnished, upon request, to prevent any “nut to plate” binding during offset.