A worn diaphragm causes valve failure, air leaks, and costly downtime. The ASCO C113685 diaphragm kit is the direct replacement for 2″ and 2-1/2″ ASCO pulse valves used in dust collection systems. This guide covers exactly which valves it fits, its technical specifications, and how to choose between OEM and aftermarket options.
You will learn the compatible valve models, operating parameters, and practical buying advice to ensure you get the right kit the first time. Whether you maintain baghouses in a cement plant or a food processing facility, this information will help you keep your system running efficiently.
Which Valves Does the C113685 Kit Fit?
The ASCO C113685 diaphragm kit is specifically designed for larger pulse jet valves in the ASCO 353 series. According to manufacturer specifications, this kit fits the following valve models :
| Valve Model | Port Size | Application |
|---|---|---|
| SCG353A050 | 2″ (DN50) | Standard dust collector pulse valve |
| SCG353A051 | 2-1/2″ (DN65) | High-volume pulse cleaning |
| SCG353A047 | 1-1/2″ | Additional compatible model |
Some aftermarket suppliers also list this kit for SCG353A061 valves . Always verify your valve’s model number on the nameplate before ordering.
Technical Specifications
Understanding the specifications helps you select the correct replacement and verify compatibility with your operating conditions.
Dimensions and Physical Properties
- Diaphragm Outer Diameter: 145mm
- Center Distance: 145.5mm
- Mounting Hole Size: 8.5mm
- Mounting Holes: Typically 4 or 6 depending on the valve variant
- Bleed Hole: 1 (critical for proper pilot operation)
- Spring: 1 stainless steel spring included
- Net Weight: Approximately 145g per set
Material Options
The standard material for the C113685 diaphragm is NBR (Nitrile rubber) , which offers excellent oil resistance and durability for general compressed air applications . Alternative materials are available from aftermarket suppliers:
| Material | Temperature Range | Best For |
|---|---|---|
| NBR (Nitrile) | -10°C to 70°C | General purpose, oil resistance |
| FKM (Viton) | Up to 180°C | High-temperature applications |
| EPDM | -40°C to 150°C | Steam, hot water, outdoor exposure |
Internal Components of the Kit
A complete ASCO C113685 repair kit contains all wear parts needed for a full valve rebuild. Based on manufacturer and aftermarket listings, the kit includes :
- Main diaphragm: The large rubber membrane that creates the seal
- Secondary diaphragm (pilot seal): Small sealing disc for the pilot mechanism
- Stainless steel spring: Provides return force for the pilot
- Gaskets and o-rings: Additional sealing elements (varies by supplier)
Some aftermarket kits package the C113685 (main diaphragm assembly) separately from the C113686 (pilot seal assembly), so verify you are receiving all necessary components .
OEM vs. Aftermarket: Which Should You Choose?
When purchasing a C113685 diaphragm kit, you have two primary sourcing options.
Genuine ASCO / Emerson Kits
- Advantages: Guaranteed fit, exact material specifications, OEM quality control
- Disadvantages: Higher price, longer lead times for some distributors
- Best for: Critical applications, warranty requirements, regulated industries
Genuine kits are available through authorized distributors like Kempston Controls, which lists the C113685 as a solenoid valve spare part kit for Series 353 valves .
Aftermarket Compatible Kits
- Advantages: 30-50% cost savings, faster shipping, often in stock
- Disadvantages: Variable quality, need to verify material claims
- Best for: Routine maintenance, budget-conscious operations, non-critical applications
Aftermarket options from suppliers like Ningbo Brando Hardware offer the C113685 kit with NBR material at competitive pricing .
Quality Checklist for Aftermarket Purchases
When buying from an aftermarket supplier, ask these questions:
- Is the diaphragm material NBR, FKM, or EPDM?
- Does the kit include both the main diaphragm and pilot seal?
- What is the country of origin? (Many high-quality kits come from ISO-certified Chinese manufacturers )
- Is there a warranty or return policy?
Applications and Industries
The ASCO C113685 repair kit is used wherever 2″ or 2-1/2″ pulse jet valves operate. Common industries include :
- Cement and aggregate production: Baghouse dust collectors on kilns and mills
- Power generation: Coal-fired boiler fly ash collection
- Food processing: Flour mills, grain handling, and food dust control
- Pharmaceutical manufacturing: FDA-compliant pneumatic conveying systems
- Metalworking: Foundry dust extraction and fluid recycling
- Environmental engineering: Municipal and industrial air pollution control
Installation and Maintenance Tips
Proper installation extends the lifespan of your C113685 diaphragm.
Before Installation
- Verify the valve model number matches the kit compatibility chart
- Ensure the air supply is clean and dry – moisture degrades diaphragms
- Inspect the valve body seat for nicks or debris
During Installation
- Remove the old diaphragm carefully – do not scratch the sealing surface
- Install the new diaphragm without twisting or overstretching
- Ensure the bleed hole is aligned correctly
- Torque bonnet screws evenly to prevent uneven compression
Signs of Diaphragm Failure
- Audible air leaks from the vent port
- Valve fails to open or close completely
- Pressure drop across the valve increases
- Visible cracking or hardening of the rubber
Environmental and Operating Parameters
When selecting a C113685 diaphragm kit, consider your specific operating conditions :
| Parameter | NBR Kit | FKM/Viton Kit |
|---|---|---|
| Working pressure | 0.4–0.8 MPa (58–116 psi) | 0.4–0.8 MPa |
| Temperature range | -10°C to 70°C (14°F to 158°F) | Up to 180°C (356°F) |
| Medium compatibility | Air, oil mist, general industrial gases | Aggressive chemicals, high heat |
| Service life (standard conditions) | 1–5 million cycles | 1–2 million cycles |
Conclusion
The ASCO C113685 diaphragm kit is the essential wear-part replacement for 2″ SCG353A050 and 2-1/2″ SCG353A051 pulse valves. Key takeaways:
- Compatibility: Fits SCG353A050, SCG353A051, and SCG353A047
- Dimensions: 145mm outer diameter, 145.5mm center distance, 8.5mm mounting holes
- Materials: NBR standard, FKM/Viton for high-temperature applications
- Kit contents: Main diaphragm, pilot seal, and spring
- Sourcing options: Genuine ASCO OEM or cost-effective aftermarket kits
Ready to order your C113685 repair kit? Browse our selection of genuine ASCO and compatible aftermarket kits. Contact our technical team with your valve model number for a guaranteed match.