## Vacuum Bellows and Hoses for SNVS Equipment Reliable vacuum bellows and hoses are consumable components for hermetically connecting vacuum pumps to the working chambers of drying ovens, furnaces, and installations. Their quality and compatibility directly affect the pumping speed, vacuum depth stability, and uninterrupted operation of the entire thermal complex. We supply reinforced vacuum hoses and bellows from trusted manufacturers, guaranteeing full compliance with the technical requirements of your equipment. This page is for specialists maintaining vacuum lines. Searching for a hose or bellow often indicates one of two situations: routine maintenance or signs of equipment wear. We offer not only consumables but also expertise to analyze the second situation. ## Purpose and Design: Hose / Bellow A vacuum hose (sleeve) is a flexible pipeline whose main task is to transport gases (air, vapors) from the working chamber volume to the pump. Unlike standard PVC hoses, a vacuum hose for industrial equipment is reinforced—it has a metal or polymer spiral in the wall that prevents collapse (maintaining the cross-section) under atmospheric pressure at deep vacuum. Vacuum hoses are typically used for low-vacuum drying ovens and other structures that do not require deep vacuum with low-capacity pumps. Connection: barbed fitting. A vacuum bellow is a corrugated pipe element (metal or rubber) with flange connections at the ends, performing the same functions as a hose but with the additional ability to significantly compress, stretch, and bend without losing tightness. It is used for connecting high-capacity pumps. Bellows are used to compensate for: - Thermal expansions of system elements. - Vibrations from pump equipment operation. - Misalignment of axes during installation (coaxiality errors). Both components are consumables and require periodic replacement during operation. ## Selection Criteria: Material, Diameter, Pressure Proper selection of a hose or bellow determines the durability and reliability of the vacuum circuit. Key parameters to consider: **Material of Manufacture**: - Silicone: A universal choice for most applications. It has good elasticity, a wide temperature range (from -60°C to +200°C), and is resistant to aging. Suitable for SNVS vacuum drying ovens. - EPDM Rubber: Excellent resistance to steam, hot water, and some chemical environments. Often used in the food and pharmaceutical industries. - Fluoroelastomer (FKM, Viton): High chemical resistance to oils, fuels, and aggressive solvents. Used under high chemical loads. - Metal (Stainless Steel): For bellows in high-temperature environments, aggressive media, or where maximum durability is required. **Connection Diameter and Length** The diameter must exactly match the sizes of the pump and vacuum chamber flanges or fittings. Standard sizes: DN 25, DN 32, DN 40, DN 50. The length is selected considering the distance between equipment and the need to compensate for displacements. **Operating Parameters:** - Vacuum Depth: Hoses are designed for operation in the range from atmospheric pressure to 10⁻³ mbar (low and medium vacuum). - Temperature Range: Depending on the material, from -60°C to +250°C. IMPORTANT: Using incompatible or low-quality hoses can lead to system depressurization, vacuum loss, increased pump load, and consequently, long and costly production downtime. ## Table 1. Recommendations for the Use of Vacuum Pipelines Depending on the Pumped Medium.

Flange/Bellow Material	Properties	Typical Use Scenario / Possible Solution
Reinforced Silicone	Elasticity, heat resistance, long service life	Standard vacuum drying ovens. If frequent replacement is required, check the service life of the entire vacuum line. View modern analogs
Reinforced EPDM Rubber	Resistance to steam, flexibility at low temperatures	Drying with intense steam generation. For processes with constant humidity, consider oven models with an optimized condensation system.
Fluoroelastomer (Viton)	Chemical resistance to oils and solvents	Aggressive process media. Increased wear may indicate an outdated seal or chamber design.
Stainless Steel (Bellow)	Maximum strength, heat and chemical resistance	High-temperature and aggressive media. Requires maximum system reliability. For such tasks, we design specialized furnaces.

## Signs of Wear and Replacement Frequency Hoses and bellows are subject to natural aging. Timely replacement prevents unscheduled stops. **Typical Signs of Wear**: - Loss of elasticity: The hose becomes stiff and bends poorly. - Surface cracks: Especially at bends or near clamps. - Bulging or delamination: Indicates destruction of the internal reinforcement structure. - Noticeable drop in pumping speed with a working pump—may indicate leakage through microcracks. The average recommended preventive replacement interval is 1-3 years, depending on operating intensity, working temperatures, and chemical compatibility of materials. Regular visual inspection should be performed quarterly. ## Consumables or Modernization? When Replacing a Hose Is Only a Temporary Solution SNVS equipment is designed as a balanced system. Installing components with mismatched diameters or characteristics leads to: The risk of sudden depressurization, which can cause chamber contamination (e.g., with oil from the pump or the environment) and product spoilage. Failure of the vacuum pump due to operation in abnormal mode, for example, during prolonged operation. Tula-Term ensures the supply of original and fully compatible consumables throughout the entire life cycle of vacuum equipment. We guarantee that every vacuum hose or bellow purchased from us will match the specifications of your SNVS vacuum drying oven. If your equipment requires component replacement more often than once every 1-2 years, consider diagnosing the entire vacuum system. [Modern models](https://tula-term.ru/oborudovanie/vakuumnye-sushilnye-shkafy-dlya-nizkogo-vakuuma "Modern models") feature improved design, convenience, and longer service life. [You might consider purchasing a vacuum filter-cooler in a chemically resistant version for aggressive media](https://tula-term.ru/oborudovanie/vakuumnaya-ohlazhdayushaya-lovushka-fvh-himicheski-stojkogo-ispolneniya "You might consider purchasing a vacuum filter-cooler in a chemically resistant version for aggressive media"). ## Comprehensive Offer and Expertise We will select a compatible component for your SNVS. But our goal is to ensure a stable technological process for you. If your equipment is morally or physically obsolete, we will offer a cost-effective upgrade or replacement option. In addition to vacuum hoses and bellows, maintaining the tightness of your system may require: - [Silicone seals "RBV" for vacuum furnaces](https://tula-term.ru/product/silikonovye-uplotneniya-rbv "Silicone seals 'RBV' for vacuum furnaces"). - [Other spare parts and components](https://tula-term.ru/oborudovanie/komplektuyushie "Other spare parts and components"). ## Our Offer The cost of a new hose is incomparable to the losses from vacuum line downtime. Timely replacement ensures uninterrupted operation and product quality preservation. [Get a consultation and component selection](https://tula-term.ru/o-kompanii/kontakty "Get a consultation and component selection") for your SNVS equipment. Send us your installation model and required connection parameters (diameter, flange type), and we will promptly offer supply options with technical specifications and a commercial proposal.

Vacuum bellows and hoses