Valve Plates for 65 mm Cylinder Head, V-0.25 and W-0.36 Compressors (set of 2, intake and exhaust)
Valve plates are the working elements of the intake and exhaust valves in the cylinder head of a piston compressor. On the suction stroke, vacuum opens the intake plate and air enters the cylinder; on the compression stroke it is pressed against its seat and closes, while air pressure opens the exhaust plate and compressed air flows to the receiver. Steel plates open and close thousands of times a minute, so they wear, lose flatness and stop sealing tightly against the seat.
1. Purpose and operating principle
The set consists of two steel plates of different sizes: intake and exhaust — for a cylinder head with a 65 mm bore. It is used to restore the performance of V-0.25 and W-0.36 compressors when they take a long time to build pressure, fail to hold it or run hot.
2. Technical specifications
| Parameter | Value |
|---|---|
| Purpose | Valve plates for the cylinder head (intake and exhaust) |
| Set contents | 2 pcs: intake + exhaust |
| Cylinder diameter | 65 mm |
| Applicability | V-0.25, W-0.36 compressors |
| Material | Steel |
| Large plate | 77 × 38 mm (L × W) |
| Small plate | 52 × 16 mm (L × W) |
| Large plate holes | 9.5 mm; Ø2.75 mm holes, 17 mm apart (per the supplier’s description) |
| Small plate hole | Ø5.5 mm |
| Set weight | approx. 0.1 kg |
⚠️ Not confirmed, check with a manager or against a sample: plate thickness, steel grade, hardness and coating; which of the two plates is the intake and which is the exhaust; the exact meaning of the large-plate hole dimensions (“9.5 mm” and “Ø2.75 mm at 17 mm spacing” are given in the supplier’s description without a drawing); the manufacturer’s part number. Applicability to the V-0.25 and W-0.36 is based on the 65 mm cylinder diameter; heads of these models can differ between manufacturers, so compare the plate dimensions with your old ones before ordering.
3. Design features
Compressor designation breakdown:
| Element | Meaning |
|---|---|
| V | Cylinder arrangement: V-type (usually two cylinders) ⚠️ |
| W | Cylinder arrangement: W-type (usually three cylinders) ⚠️ |
| 0.25 / 0.36 | Pump unit capacity, m³/min (per the usual marking) ⚠️ |
The set is intended for one cylinder head: it contains one intake and one exhaust plate. Two- and three-cylinder units need as many sets as they have cylinders ⚠️ (confirm for your unit).
Design solutions:
- Two plates of different sizes (77 × 38 mm and 52 × 16 mm) — the intake and exhaust plates have their own seats and are not interchangeable.
- Steel construction — withstands frequent opening and closing cycles and the temperature of the compressed air in the head.
- Locating and calibrated holes of different diameters (9.5 / 2.75 / 5.5 mm) — fix the plate position and pass air through the seat ⚠️ (the purpose of each hole should be confirmed from a drawing).
4. Installation recommendations
- Release the pressure and disconnect power. Before disassembly, fully vent the receiver and switch off the supply.
- Note the position of the parts. When removing the head, photograph how the plates and gasket lie and which way they face.
- Clean the seat and the head face of carbon, oil and gasket residue; there must be no deep scoring or pitting on the seat.
- Fit the plates in their own places. Do not swap the large and small plates or fit them skewed; do not bend them during installation — a bent plate does not seat properly.
- Replace the head gasket with a new one. An old gasket is a frequent cause of air leaks after repair.
- Tighten the head bolts in a crisscross pattern, evenly. Tightening torque — per the compressor manufacturer’s data ⚠️ (not confirmed). Do not overtighten: the head may warp.
- Check operation. After assembly, run the compressor and check the pressure build-up time and tightness (with the compressor stopped, watch for pressure drop); recheck bolt tightness after the first hours of operation.
- Replace both plates at once — the intake and exhaust plates wear under the same conditions.
5. Alternatives and comparison
We have no OEM numbers for this set. In other suppliers’ catalogs, a set with the same dimensions (77 × 38 and 52 × 16 mm, 65 mm cylinder) appears under the code CH140 (Barracuda brand) — this is the seller’s catalog code, not a compressor manufacturer’s part number, so compare the dimensions themselves.
Selection is made by cylinder diameter and plate dimensions:
| Parameter to check | What to verify |
|---|---|
| Cylinder diameter | 65 mm |
| Plate dimensions | 77 × 38 mm and 52 × 16 mm |
| Hole diameters | 9.5 mm, Ø2.75 mm (17 mm pitch), Ø5.5 mm |
| Number of plates | Two per head: intake and exhaust |
Sets for other cylinder diameters (for example 80 or 90 mm) have different dimensions and do not fit. The best way to select the part is to bring or send a photo of the old plates with their dimensions, or the compressor model from the nameplate.
6. Common mistakes
- Replacing only one plate. The intake and exhaust plates work as a pair; if one is replaced, the other fails quickly and the fault returns.
- Swapped or turned-around plates. The compressor stops pumping or overheats; note the position before disassembly.
- Uncleaned seat and old gasket. Carbon and scoring prevent the plate from seating, air flows back into the cylinder, and output is not restored.
- Selecting by the “65 mm” size alone. Plates from different manufacturers differ in dimensions and holes; check 77 × 38 and 52 × 16 mm.
- Plate bent during installation. Any bend ruins the seal; the new part will not last.
- Overtightening or uneven tightening of head bolts. The head warps and the gasket leaks air.
- Running without a serviceable air filter. Abrasive dust wears the seat and plates several times faster.
7. Applications
- Repair and maintenance of V-0.25 and W-0.36 piston compressors with a 65 mm cylinder diameter.
- Restoring performance when the receiver fills slowly, pressure drops on the stopped compressor, or the head overheats.
- Workshops, car repair shops, garages and small production sites where the compressor is the main source of compressed air.
8. Expert opinion
“If a compressor has started taking a long time to build pressure or won’t hold it, and the piston group is fine, check the valve plates first. It is the most common cause of lost performance, and the repair is inexpensive. Replace both plates at once, clean the seat and fit a new head gasket. And be sure to photograph the position of the parts before disassembly: the intake and exhaust plates are easy to mix up, and after that the compressor simply won’t work.”
Vitali Boluchevski, Lead Engineer, Acvatron SRL, 18 years of experience
9. FAQ
1. How do I know the valve plates need replacing? Signs: the compressor takes a long time to build pressure, does not hold pressure with the motor stopped, the head overheats, output drops. Before replacing them, make sure the piston group and the air filter are in good condition.
2. How many sets do I need per compressor? One set (two plates) is intended for one cylinder head. Two- and three-cylinder units (V and W) need as many sets as they have cylinders ⚠️; confirm for your model.
3. Will the plates fit another compressor with a 65 mm cylinder? Possibly, but only after checking the dimensions: 77 × 38 mm (large) and 52 × 16 mm (small), and the hole diameters. Send a manager a photo of your old plates.
4. Do I need to replace the head gasket? Yes, when removing the head, replace it with a new one. An old gasket is the main cause of air leaks after repair.
5. How do I avoid mixing up the plates during installation? Photograph the position before disassembly. The plates are different sizes (77 × 38 and 52 × 16 mm) and occupy their own seats in the head. If you are unsure which is the intake and which is the exhaust, check with a manager.
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