'industrial models'

PERFORMANCE YOU CAN TRUST ON The DHVE series is the ultimate range of best oil sealed rotary vane pumps- The result of more than 35 years’ experience and a clean sheet design programmer, these rugged vacuum pumps offer an excellent ultimate vacuum with good pumping speeds as well as superior vapor handling capabilities and quiet operation. The firm offers Rotary vane vacuum pumps are designed with decade of experience for excellent performance and modest maintenance. They are widely used for Laboratory distillation, Screen Printing, Bottle Filling Pharmaceuticals, Food beverages industries with proven performance. These pumps are available in various models such as V-Belt Driven, Direct Driven and Flange type. Specialist in compact design is its success for application in Offset Printing, Cartooning, Powder filling, Labelling, Packaging Industries. Versatile vacuum pumps with unique features successfully proved on Semi / High speed automatic Capsule filling machines / Filtration / transferring / Holding / Conveying & Packaging machines. Applications- You can be assured DHVE has the application expertise and the pumps or integrated system solution to meet your needs. Mass spectrometry- • GCMS, LCMS, ICPMS, MALDI, RGA, surface science, leak detectors High energy physics- • Beam lines, accelerators, mobile pump carts, turbomolecular pump backing, laser evacuation Research and development- • Chamber evacuation, coating systems, turbomolecular pump backing Industrial- • Glove boxes, coating systems, freeze drying, gas bottle filling/emptying, refrigeration system manufacture, degassing/curing (oil, epoxy resin) Chemical- • Gel dryers, glove boxes, rotary evaporators, centrifuges, distillation/extraction/filtration

In today's high-stakes manufacturing and processing environments, achieving a truly oil-free, high-efficiency vacuum is non-negotiable. Traditional pumps often introduce the risk of contamination, high maintenance burdens, and poor energy performance. Dinesh High Vacuum Engineering (DHVE) is proud to present its next-generation line of Dry Screw Vacuum Pumps—the definitive solution for applications demanding purity, precision, and the lowest possible cost of ownership. This detailed guide explores the superior technology, advanced features, and material science that make DHVE dry screw pumps the industry's gold standard. ⚙️ Technical Mastery: The Science Behind DHVE Dry Screw Pumps A dry screw pump is a masterpiece of precision engineering. Unlike wet pumps, which rely on lubricating fluids, the DHVE dry screw mechanism achieves its vacuum purely through mechanical action in an oil-free environment. The Core Mechanism: Non-Contact Compression The heart of the pump consists of two parallel, precision-machined helical screw rotors that rotate in perfect synchronization. Axial Gas Transport: As the rotors spin in opposite directions, the threads intermesh without making physical contact. This action traps process gas at the inlet and progressively transports it along the axis of the screws toward the exhaust. Internal Compression (Variable Pitch): DHVE models utilize a variable pitch screw design. This advanced geometry features a decreasing pitch (thread spacing) toward the discharge end. This progressive reduction in volume creates internal compression, which is a crucial feature: It minimizes the pressure difference between the last compression chamber and the exhaust, significantly reducing backflow leakage (or 'slip losses'). This results in higher volumetric efficiency and lower power consumption compared to constant-pitch designs. Gap Sealing: The vacuum is maintained by extremely tight, micron-level clearances between the rotors and the casing, and between the rotors themselves. This non-contact principle eliminates wear, ensures process purity, and is the foundation for the pump’s exceptional reliability. 🛡️ Corrosion & Contaminant Handling: Built for Harsh Environments The dry screw design inherently handles condensable vapors and particulates better than oil-sealed pumps. However, for the aggressive chemical and pharmaceutical sectors, DHVE offers pumps built with specialized material science to ensure longevity and zero failure. Advanced Materials for Chemical Resistance For applications involving highly corrosive gases like concentrated acids, solvents, and chlorides, Dinesh High Vacuum Engineering utilizes premium materials and coatings: Stainless Steel Rotors (316L and Duplex): For mild to moderately corrosive process streams, 316L offers excellent general resistance. For extreme environments, Duplex stainless steel (UNS S32205 / S32750) is utilized, providing superior resistance to pitting, crevice corrosion, and stress cracking, especially against chlorides and organic acids. Anti-Corrosion Coatings: The internal surfaces of the pump casing and rotors are often protected with thick, robust coatings such as Nickel Plating (ENP) or PEEK (Polyether Ether Ketone).14 These barrier layers prevent direct contact between the metal substrate and the aggressive process media. Gas Ballast System: Every DHVE dry screw pump is equipped with a gas ballast port. Introducing a small, controlled amount of inert gas (like Nitrogen) heats the pump and lowers the partial pressure of condensable vapors, ensuring they remain in the gaseous state and are safely expelled, preventing liquid condensation and subsequent corrosion. 🌐 Applications & Industrial Purity The unique combination of oil-free operation, VSD energy efficiency, and chemical resistance makes the DHVE Dry Screw Vacuum Pump the definitive choice across critical industries: Pharmaceuticals & Lyophilization: Guarantees absolute product purity, essential for drug safety and solvent recovery processes like freeze drying. Semiconductor & Electronics: Meets the stringent demands for ultra-clean vacuum required in PVD/CVD coating, etching, and load lock chambers. Chemical Processing: Reliable performance in challenging duties such as vacuum distillation, solvent stripping, and reactor service, backed by our corrosion-resistant material options. Ready to Optimize Your Vacuum Process? The decision to invest in a Dry Screw Vacuum Pump is an investment in process reliability, energy efficiency, and product purity. By choosing Dinesh High Vacuum Engineering (DHVE), you gain access to cutting-edge technology, expert application support, and a pumping solution engineered for decades of low-maintenance operation. ➡️ Contact Dinesh High Vacuum Engineering today to speak with one of our vacuum specialists and receive a quote tailored to your exact industrial requirements!

For applications that demand the absolute highest standards of vacuum purity, stability, and speed, the Turbomolecular Pump (TMP) is the undisputed technology of choice. Operating in the high vacuum (HV) and ultra-high vacuum (UHV) regimes (down to $10^{-11} mbar), TMPs are the essential workhorses of the semiconductor, research, and analytical science industries. Dinesh High Vacuum Engineering (DHVE) delivers state-of-the-art Turbomolecular Pumps, combining high rotational speeds, advanced bearing technologies, and expert engineering to ensure a hydrocarbon-free environment for your most sensitive processes. I. ⚙️ The Core Principle: Momentum Transfer in Molecular Flow The Turbomolecular Pump functions as a highly specialized, multi-stage momentum transfer pump. It works on the principle that gas molecules, under the conditions of molecular flow, can be given momentum in a preferred direction by repeated collisions with a fast-moving solid surface. How the TMP Achieves UHV Molecular Flow: TMPs are effective only when the system is already at a low enough pressure (typically below $10^{-3} mbar) where the gas is in the molecular flow regime. In this regime, the mean free path of gas molecules is greater than the distance between the pump's internal surfaces. This means molecules collide primarily with the pump surfaces rather than with each other. Rotor and Stator Blades: The pump consists of multiple alternating stages of rapidly rotating rotor blades and stationary stator blades (or discs) that resemble a jet engine turbine. Rotor Action: The rotor blades, spinning at extremely high speeds (often 20,000 to 90,000 RPM), 'hit' gas molecules, imparting a downward momentum towards the pump's exhaust. The resulting velocity of the molecule is the sum of its thermal velocity and the rotor's blade velocity. Stator Action: The fixed stator blades act as baffles, preventing the now-accelerated molecules from moving back toward the inlet while directing them into the next stage of the rotor. Compression: This repetitive collision process, across many stages, successively compresses the gas until it reaches a high enough pressure to be efficiently removed by a backing pump (fore-vacuum pump), typically a dry screw or rotary vane pump. II. 💡 Modern Turbopump Design: Hybrid and Wide-Range Models Modern TMPs often feature a hybrid design to enhance performance across the pump's pressure range: Turbine Stages (Inlet): These stages, with finely pitched blades, are optimized for maximum pumping speed at very low pressure (molecular flow). Molecular Drag Stages (Exhaust): Located near the backing pump, these stages (e.g., Holweck or Siegbahn mechanisms) use rotating drums or discs with helical channels to actively drag gas molecules. They are optimized for higher compression ratios at higher pressures, which dramatically improves the pump's ability to handle the light gases (like Hydrogen and Helium) and allows for a smaller, more economical backing pump. DHVE specializes in Wide-Range TMPs that integrate these drag stages, offering a superior compression ratio, especially for light gases which often leak back through traditional pure turbine designs. IV. 🌍 Essential Applications for DHVE Turbomolecular Pumps The superior ultimate vacuum, clean operation, and high pumping speed make TMPs from Dinesh High Vacuum Engineering indispensable in the following critical fields: Semiconductor Manufacturing: Essential for demanding processes like PVD (Physical Vapor Deposition), CVD (Chemical Vapor Deposition), and ion implantation where even trace hydrocarbon contamination can destroy microchips. Analytical Instruments: Used in Mass Spectrometry (MS), Gas Chromatography-Mass Spectrometry (GC-MS), and Electron Microscopy (SEM/TEM) to create the ultra-clean vacuum required for particle beam generation and precision analysis. Research & Development: Critical for high-energy physics accelerators, space simulation chambers, and surface science experiments that necessitate extreme vacuum conditions (UHV). Coating Industry: Key for achieving high-quality, defect-free optical and thin-film coatings. Partner with Dinesh High Vacuum Engineering For over 30 years, Dinesh High Vacuum Engineering (DHVE) has been a trusted manufacturer in the high-vacuum technology space. Our Turbomolecular Pumps are engineered for demanding industrial uptime, minimal vibration, and unparalleled purity, ensuring reliable performance in your most sensitive vacuum processes. ➡️ Contact Dinesh High Vacuum Engineering today to discuss your specific UHV requirements and find the perfect Turbomolecular Pump solution for your application.

For rugged industrial applications requiring dependable performance in the rough to medium vacuum range (typically 10^{-1} to 10^3 mbar), the Piston Vacuum Pump remains a foundational technology. Known for its robust construction, deep vacuum capabilities for its class, and resilience in demanding environments, the reciprocating piston pump is a true industrial workhorse. Dinesh High Vacuum Engineering (DHVE) offers a comprehensive range of piston vacuum pumps, engineered to deliver high volumetric efficiency and sustained performance across diverse applications, from filtration to material handling. I. ⚙️ Principle of Operation: Positive Displacement with Precision The Piston Vacuum Pump belongs to the positive displacement family, utilizing a simple yet highly effective mechanical action to evacuate gases. The Reciprocating Mechanism Cylinder and Piston: The core of the pump consists of a cylinder in which a piston moves reciprocally (back and forth). This motion is driven by a crank-connecting rod mechanism linked to an electric motor. Intake Stroke (Vacuum Creation): As the piston moves away from the cylinder head (retracts), it increases the volume of the chamber. This expansion causes the pressure inside the cylinder to drop significantly below the pressure of the vessel being evacuated. The pressure differential causes the gas to be drawn into the cylinder through the suction (inlet) valve. Compression Stroke (Exhaust): Once the piston reaches its full retraction point, the suction valve closes, trapping the gas. The piston then moves forward, decreasing the volume and compressing the trapped gas. Discharge: When the pressure of the compressed gas reaches a point slightly above atmospheric pressure, the discharge (exhaust) valve opens, expelling the gas. DHVE offers both single-acting (evacuation occurs on one piston stroke) and double-acting (evacuation occurs on both strokes for a steadier flow) piston pump designs to meet specific flow rate and consistency requirements. II. 🌟 Key Advantages of Piston Vacuum Pumps The simple and sturdy mechanical design of the Piston Vacuum Pump offers distinct benefits in many industrial settings: Deep Rough Vacuum Capability: Piston pumps excel at achieving strong vacuum levels in the rough to medium range, often reaching $10^{-1} Pa (10^{-3} mbar) in multi-stage designs, making them highly efficient for batch processes. Rugged Durability: Constructed from durable materials like cast iron and specialized alloys, these pumps are built to withstand continuous, heavy-duty operation and maintain performance even in harsh, dusty, or humid industrial environments. High Volumetric Efficiency: Due to their robust seals and positive displacement nature, they maintain high pumping speeds across a wide range of operating pressures. Ease of Service: With a relatively simple and accessible mechanical layout, piston pumps are generally easy to maintain and service, leading to reduced downtime and lower long-term repair costs. III. DHVE Focus: Oil-Lubricated vs. Oil-Free Piston Pumps Piston pump technology comes in two main variants, each suited for different priorities: Oil-Lubricated Piston Pumps (DHVE Industrial Models): Features: Utilize oil to cool and lubricate the piston, cylinder walls, and valves, while also improving the seal for a deeper ultimate vacuum. They often include a Gas Ballast feature to prevent water vapor condensation. Ideal For: High-capacity industrial applications where maximum vacuum depth and durability are prioritized over absolute cleanliness (e.g., vacuum impregnation, drying). Oil-Free Piston Pumps (DHVE Laboratory Models): Features: Rely on specialized composite piston rings and cylinder materials to operate without oil. Ideal For: Small-scale, portable, or laboratory applications (e.g., suction, small-chamber evacuation) where the 100% oil-free discharge is critical, despite sacrificing some ultimate vacuum depth compared to lubricated models. Trust Dinesh High Vacuum Engineering for Industrial Vacuum When you choose a Piston Vacuum Pump from Dinesh High Vacuum Engineering (DHVE), you are selecting a solution backed by years of expertise in vacuum technology. Our piston pumps are designed for maximum efficiency, long operational life, and minimal need for servicing, offering you the lowest TCO in industrial rough vacuum. ➡️ Contact Dinesh High Vacuum Engineering today to consult with our experts on selecting the optimal Piston Vacuum Pump model and configuration for your heavy-duty industrial vacuum needs!

For modern vacuum systems requiring automated control, data logging, and high precision in the rough to medium vacuum range (999 to 10^{-3} mbar), the Digital Pirani Vacuum Gauge is the essential sensor. Unlike its analog counterpart, the digital Pirani integrates sophisticated electronics and microprocessors directly into the sensor head, providing enhanced stability, accuracy, and seamless integration into industrial control systems.1 Dinesh High Vacuum Engineering (DHVE) supplies advanced Digital Pirani Gauges, designed to meet the rigorous demands of automated industrial and laboratory processes. I. ⚙️ Principle & Digital Enhancement The fundamental principle of the Pirani Gauge—measuring pressure based on the thermal conductivity of the gas and the resulting change in the filament's electrical resistance—remains the same. However, the digital design enhances this measurement significantly: Microprocessor Integration: The sensor includes an embedded microcontroller that performs the complex functions of signal conditioning, linearization, and computation right at the source. Temperature Compensation: A key function of the digital circuitry is automatic temperature compensation. Since the filament's resistance is affected by ambient temperature changes, the microprocessor uses a secondary reference sensor to continuously correct the pressure reading, ensuring high accuracy and stability regardless of environmental fluctuations. Linearization: In the Pirani range, the relationship between pressure and resistance is inherently non-linear.4 The digital circuitry uses look-up tables or mathematical models to linearize the output signal, providing a smooth and highly accurate reading across the full range, especially at the transition point between rough and medium vacuum. II. 🌟 Key Advantages of DHVE Digital Pirani Gauges The integration of smart electronics provides several powerful operational benefits over traditional analog units: High Accuracy and Resolution: Due to advanced compensation and linearization, DHVE Digital Pirani Gauges offer superior measurement resolution and lower measurement uncertainty than standard analog devices. Seamless Digital Communication: Digital gauges are equipped with modern communication protocols (e.g., RS-232, RS-485, Modbus, or fieldbus) that allow for direct, noise-immune data transfer to PLCs, computers, and centralized control systems. This is vital for Industry 4.0 automation. Integrated Control Relays: Most digital units include built-in, user-configurable set-point relays.8 These relays can be programmed to automatically switch based on specific pressure thresholds (e.g., turning off the roughing pump or opening a high vacuum valve), simplifying system interlocks and safety mechanisms. Integrated Display: Many models feature a direct LED or LCD digital display on the sensor head, allowing local reading of the pressure value with high precision, complementing the remote electronic signal. Automatic Calibration: DHVE digital gauges often include features for automatic zero adjustment with the push of a button or via a remote command, simplifying maintenance and ensuring the gauge is always calibrated against a known reference. III. 🌍 Applications for Automated Vacuum Control The precision and connectivity of the Digital Pirani Gauge make it the preferred sensor for all automated and data-intensive vacuum processes: Automated Vacuum Coating (PVD/CVD): Precisely monitoring and controlling pressure during gas dosing and pump-down stages to ensure coating quality and batch consistency. Fore-Vacuum Interlocks: Providing the critical, highly reliable signal needed to safely switch on sensitive Turbomolecular Pumps or Roots Blowers when the required low base pressure is reached. Data-Intensive Research: Used in research facilities and universities for continuous, logged pressure data collection in experiments involving vacuum ovens, freeze dryers, and analytical instrumentation.10 Central Vacuum Systems: Monitoring and providing feedback for large, multi-user vacuum networks in manufacturing facilities or large research labs. Optimize Automation with DHVE Digital Sensors The Digital Pirani Vacuum Gauge from Dinesh High Vacuum Engineering (DHVE) is not just a sensor; it's a smart control component. It delivers the precision, stability, and connectivity required to optimize your pump-down times, protect your high-vacuum equipment, and fully automate your vacuum cycles. ➡️ Future-proof your vacuum system with advanced monitoring. Contact Dinesh High Vacuum Engineering today to integrate our high-precision Digital Pirani Gauges into your automated processes!

Banking on the ability and knowledge of skilled team of workers, we are engaged in providing a quality rich quality of Vacuum Oils to meet various requirements of our clientele. These products are accessible in market in dissimilar packaging options. In addition to this, we assure optimum quality and properly checked and safely delivered at reasonable prices. Features & Benefits of Rotary Vacuum Pump Oil : Thermal Stability Provides excellent lubrication to the pump Low vapor pressure High viscosity index Excellent Vacuum Level Suitable for rotary/mechanical vacuum pumps of all makes and models around the world.

DHVE has over 5 decades of experience in innovative design and development of vacuum heat treatment and Brazing furnaces, from small laboratory models to large vertical and horizontal furnaces as well as equipment for other specialized applications. DHVE is offering complete solutions, to meet the most stringent requirements for reliability, productivity and cost-efficiency, with valuable insight into the changing needs and rigorous demands. HEAT TREATMENT & BRAZING FURNACE VERTICAL,BOTTOM & TOP LOADING FURNACE GAS & OIL QUENCHING FURNACE LABORATORY FURNACE

For accurate measurement of pressure in the rough to high vacuum range 10^{-3} to 10^1 mbar), the Pirani Gauge is an industry standard. This thermal conductivity gauge provides reliable, cost-effective, and robust pressure monitoring, making it indispensable for controlling vacuum processes and protecting high vacuum equipment. Dinesh High Vacuum Engineering (DHVE) supplies a versatile range of Pirani Gauges, offering both the simplicity and durability of Analog units and the high precision and integration features of Digital sensors, ensuring you have the right monitoring tool for every application. I. ⚙️ The Pirani Principle: Measuring Pressure via Thermal Conductivity The Pirani Gauge operates based on the principle that the thermal conductivity of gas changes proportionally with its pressure in the rough to medium vacuum range. How It Works Heated Filament: A fine metal filament (often made of platinum or tungsten) is suspended within a sensor cell exposed to the vacuum environment. Constant Heating: An electrical current is passed through the filament, heating it to a temperature significantly higher than the ambient temperature. Heat Loss: Heat is lost from the filament primarily through two mechanisms: Radiation: This heat loss to the chamber walls is relatively constant. Thermal Conduction: This heat loss to the surrounding gas molecules is pressure dependent. Pressure Measurement: As the pressure decreases (i.e., the vacuum improves), fewer gas molecules are present to carry heat away from the filament. This causes the filament's temperature to increase, which, in turn, causes its electrical resistance to increase. The gauge circuitry measures this change in resistance and converts it into a pressure reading. Note: Pirani gauges are gas-type dependent. The reading is accurate for the calibration gas (usually Nitrogen or Air). If measuring other gases (e.g., Helium, Argon), conversion factors must be applied, as each gas has a unique thermal conductivity. II. 📊 The Legacy: Analog Pirani Gauges (DHVE Classic Series) Analog Pirani Gauges are known for their simplicity, reliability, and cost-effectiveness. They utilize basic bridge circuitry and rely on a physical meter movement to display the pressure. They are often chosen for applications where a simple, quick visual confirmation of vacuum status is required. Key Features of DHVE Analog Pirani Gauges: Simple, Durable Operation: They are highly reliable with minimal complex electronics, making them durable for continuous industrial use. Visual Indication: The needle movement on the meter provides an intuitive, quick check of vacuum status (e.g., 'Good Vacuum' or 'Rough Vacuum'). Cost Efficiency: They offer the most economical entry point for accurate measurement in the 10^{-3} mbar range. Output: They typically provide a basic electrical output (often a 0-10V signal) proportional to the pressure, easily integrated with older control systems or simple relays. III. 💻 The Future: Digital Pirani Gauges (DHVE Smart Sensors) Digital Pirani Gauges integrate microcontrollers and sophisticated signal conditioning directly into the sensor head, offering greater precision, stability, and connectivity than their analog counterparts. They are essential for automated and data-intensive modern vacuum systems. Key Features of DHVE Digital Pirani Gauges: Enhanced Accuracy and Stability: Digital linearization and precise temperature compensation circuitry provide a highly stable and accurate reading across the entire measuring range. Microprocessor Control: Allows for advanced functions like automatic zero adjustment and endpoint calibration for increased precision and ease of use in the field. Digital Communication: Equipped with digital interfaces (e.g., RS-232, RS-485, or fieldbus protocols), enabling seamless integration into PLC-controlled systems, remote monitoring, and complex data logging. Integrated Display and Relays: Features integrated digital LED or LCD screens for direct pressure reading at the point of use. Many include internal set-point relays, enabling the gauge to automatically trigger system events (e.g., turning on a Turbomolecular Pump or opening a valve) when a specific pressure threshold is reached. Combined Sensing (Optional): DHVE offers advanced digital units that combine the Pirani sensor with a thermal-coupled MEMS sensor for faster response and improved linearity near atmospheric pressure. IV. 🌍 Applications Across Industries Both analog and digital Pirani Gauges are essential for many processes monitored by Dinesh High Vacuum Engineering clients. The choice between them depends on the need for simple indication versus automation and data integration: Fore-Vacuum Monitoring: Monitoring the inlet pressure to a Turbomolecular Pump or Roots Blower is crucial to ensure the backing pump reaches the safe startup pressure, often best handled by the reliable switching of Digital gauges. Vacuum Furnace Control: Used to monitor pump-down progress in the rough and medium vacuum stages. Freeze Drying (Lyophilization): Digital gauges are preferred for precise monitoring and data logging of chamber pressure during the critical drying cycles to ensure product quality. General Lab Vacuum: Analog gauges offer a simple, visual, and cost-effective pressure check for rotary evaporators or desiccators, while Digital units are integrated into analytical instrumentation. PVD/CVD Coating Systems: Used to monitor pressure during gas-backfilling and process transitions in the medium vacuum range. Choose Precision and Reliability with DHVE Whether your operation requires the fundamental reliability of an Analog Pirani Gauge or the advanced integration and precision of a Digital Pirani Gauge, Dinesh High Vacuum Engineering (DHVE) provides quality, calibrated instruments engineered for accuracy and longevity. ➡️ Optimize your vacuum system control. Contact Dinesh High Vacuum Engineering today to select the ideal Pirani Gauge—Analog or Digital—for your pressure monitoring needs and system integration requirements!

Vacuum Chamber are Precise instruments for experimentation, powerful tools for productivity DHVE Vacuum Chambers provide the foundation for a broad range of systems, serving uses from scientific experimentation to industrial production. DHVE ’s vertically integrated engineering sales, design and fabrication method positions the company to respond to stock order and custom fabrication requirements promptly and cost effectively. Component and Package leak testing, degassing, vacuum process methods, altitude flight and deep space simulations; DHVE Vacuum Chambers serve as powerful and well crafted tools in countless sciences and industries. For more info visit us at www.vaccumpumpmanufacturer.com