Air Filter Housing for Screw Compressor (15 HP / TXD4479)

1. Purpose and Operating Principle

The housing performs three tasks in the system:

• Protection of the filter element from mechanical damage and direct moisture ingress.

• Hermetic fit on the intake valve (connection diameter d1 = 40 mm / 1.57 inches), preventing the suction of unfiltered air.

• Quick replacement of the cartridge without dismantling the entire intake assembly.

A properly selected housing with a 40 mm connection diameter is a fundamental condition for the normal operation of the first-stage filtration system. Any clearance or dimensional mismatch immediately reduces the service life of the airend.

2. Technical Specifications

Main parameters of the TXD4479 model:

• Part Number / OEM No.: TXD4479

• Corresponding Standard Number (Product ID): 4404077999

• Compressor Power: 15 HP

• Rated Air Flow: 1.5–2.6 m³/min

• Connection / Mounting Diameter (d1): 40 mm (1.57 inches)

• Outer Diameter of Top Cover (d2): 145 mm (5.71 inches)

• Flange Thickness / Protrusion (e1): 25 mm (0.98 inches)

• Total Housing Height (h1): 136 mm (5.35 inches)

• Height to Inlet/Outlet Branch (h2): 76 mm (2.99 inches)

• Outlet Branch Length (l): 69 mm (2.72 inches)

• Filter Element Used (Filter paper No.): C1140

• Housing Material: Plastic

• Warranty Period: 14 days

• Availability: In stock (according to supplier data)

⚠️ Data not provided in technical documentation and cannot be confirmed. Exact weight, wall thickness, type of O-ring included, maximum allowable pressure drop, compatibility with specific OEM brands (Remeza, Aircast, MZB, Atlas Copco, etc.). Before ordering and installation, verify the 40 mm mounting diameter and dimensions with your replacement filter and valve. Clarify details with an Acvatron SRL manager.

3. Design Features

Decodification of the lineup and marking:

• TXD4479 Model: filter variant for 15 HP compressors with a reduced connection stub d1 = 40 mm.

• TXD4477–TXD4480 Lineup: general series of housings for an air flow of 1.5–2.6 m³/min and C1140 filter element, differing in the diameter of the mounting stub d1 (40 mm, 50 mm, 52 mm, or 48/M48 thread).

Design solutions:

• Plastic housing — lightweight, non-corrosive, vibration-resistant.

• 40 mm mounting size — suitable for intake valves of the corresponding diameter.

• Removable design — allows fast replacement of the C1140 replacement element without removing pipes.

• Cartridge protection against mechanical damage and direct moisture exposure.

Scope of supply. The supplier page lists only the housing itself. The availability of an O-ring, fasteners, and the C1140 filter element in the kit must be checked when ordering ⚠️.

4. Installation Recommendations

• Power lockout. Turn off the compressor and relieve system pressure (LOTO). Wait for complete stoppage.

• Dismantling. Remove the old housing, clean the mounting surface of the intake valve from dirt and old gasket residues.

• Size verification. Make sure that the mounting diameter of the new housing is exactly 40 mm (d1) and matches the valve flange/stub.

• Sealing. Install a new O-ring (if provided by the design). Do not use Teflon (PTFE) tape on flat seals.

• Fastening. Secure the housing according to the scheme. Do not over-tighten plastic elements to prevent cracks.

• Filter element. Install the C1140 cartridge with the correct airflow orientation.

• Check. Start the compressor and ensure there are no air leaks (whistle, vacuum drop on suction).

⚠️ When replacing only the housing, use the C1140 cartridge or a proven equivalent with the same dimensions.

5. Analogs and Comparison

Comparison of housing modifications for the C1140 filter (15 HP power, 1.5–2.6 m³/min flow):

• TXD4479 (this product): mounting diameter d1 = 40 mm (1.57 inches), height h1 = 136 mm.

• TXD4477: mounting diameter d1 = 50 mm (1.97 inches), height h1 = 136 mm.

• TXD4478: mounting diameter d1 = 52 mm (2.05 inches), height h1 = 136 mm.

• TXD4480: threaded stub d1 = 48/M48 (1.89 inches), height h1 = 136 mm.

The main difference of TXD4479 is the 40 mm mounting size. Adjacent series housings have different stubs (50 mm, 52 mm, M48) and are not interchangeable without checking the flange.

6. Common Errors

1. Installing a housing with a d1 diameter other than 40 mm. Leads to unfiltered air suction or impossibility of installation.

2. Using a damaged or deformed seal. Dust bypasses the filter.

3. Over-tightening plastic housing fasteners. Cracks and loss of tightness.

4. Installing the C1140 filter element “backwards”. Violation of airflow direction.

5. Ignoring the cleaning of the mounting surface. Dirt and old sealant residues create gaps.

7. Application Area

• Screw compressors with a power of 15 HP (11 kW) with an air flow rate from 1.5 to 2.6 m³/min.

• Industrial and semi-industrial pneumatic systems with moderate to high dust levels.

• Replacement of a damaged or broken standard housing without replacing the entire intake assembly.

• Maintenance of compressor stations in Moldova (Chisinau and regions).

8. Expert Opinion

„The air filter housing is not just a «box». Its tightness and correct mounting size directly determine how much dust gets into the airend. When choosing a TXD series model, always measure the d1 diameter — for example, on the TXD4479 modification, it is 40 mm. It is better to check dimensions once before installing the C1140 cartridge than to replace the airend later.”

Vitali Boluchevski, Lead Engineer, Acvatron SRL, 18 years of experience

9. FAQ

1. What is the mounting size of the TXD4479 housing? The stub diameter d1 is 40 mm (1.57 inches).

2. What filter element is used with this housing? This housing is designed for the C1140 replacement cartridge.

3. Does the housing fit a 15 HP compressor? It fits if the 40 mm mounting diameter and dimensions match. Be sure to check with your compressor documentation.

4. Is additional joint sealing required? For flat seals, only the standard ring is used. Teflon tape is not applied.