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Philmac Screwed Ratio Valve
Philmac’s Screwed Ratio pressure reducing valves are designed to control service line pressure in fixed head water systems and have been doing so for over 50 years. With a fixed, non-adjustable ratio they provide effective protection for downstream pipework and equipment. Available in threaded connections up to 2”.
SCREWED SERIES RATIO VALVES (Tested)
| Product Number | Size | |
|---|---|---|
| 90 2921 00 | 1/2″ (15mm) | |
| 90 2931 00 | 1/2″ (15mm) | |
| 90 2922 00 | 3/4″ (20mm) | |
| 90 2932 00 | 3/4″ (20mm) | |
| 90 2923 00 | 1″ (25mm) | |
| 90 2933 00 | 1″ (25mm) | |
| 90 2924 00 | 1-1/4″ (32mm) | |
| 90 2934 00 | 1-1/4″ (32mm) | |
| 90 2925 00 | 1-1/2″ (40mm) | |
| 90 2935 00 | 1-1/2″ (40mm) | |
| 90 2926 00 | 2″ (50mm) | |
| 90 2936 00 | 2″ (50mm) |
SCREWED RATIO PRESSURE REDUCING VALVES – SERVICE KIT
| Product Number | Size | |
|---|---|---|
| 90 2921 00 | 1/2″ (15mm) | |
| 90 2931 00 | 1/2″ (15mm) | |
| 90 2922 00 | 3/4″ (20mm) | |
| 90 2932 00 | 3/4″ (20mm) | |
| 90 2923 00 | 1″ (25mm) | |
| 90 2933 00 | 1″ (25mm) | |
| 90 2924 00 | 1-1/4″ (32mm) | |
| 90 2934 00 | 1-1/4″ (32mm) | |
| 90 2925 00 | 1-1/2″ (40mm) | |
| 90 2935 00 | 1-1/2″ (40mm) | |
| 90 2926 00 | 2″ (50mm) | |
| 90 2936 00 | 2″ (50mm) |
FLANGED RATIO PRESSURE REDUCING VALVES MKII – SERVICE KIT
| Product Number | Size |
|---|---|
| 90 2921 00 | 1/2″ (15mm) |
| 90 2931 00 | 1/2″ (15mm) |
| 90 2922 00 | 3/4″ (20mm) |
| 90 2932 00 | 3/4″ (20mm) |
| 90 2923 00 | 1″ (25mm) |
| 90 2933 00 | 1″ (25mm) |
| 90 2924 00 | 1-1/4″ (32mm) |
| 90 2934 00 | 1-1/4″ (32mm) |
| 90 2925 00 | 1-1/2″ (40mm) |
| 90 2935 00 | 1-1/2″ (40mm) |
| 90 2926 00 | 2″ (50mm) |
| 90 2936 00 | 2″ (50mm) |
Overview / Why Choose This Product
Philmac Screwed Ratio Valves are designed for fixed ratio pressure reduction in high-pressure water systems. With a simple, tamper-proof design and only one moving part, these valves provide reliable performance and protect downstream equipment from excess pressure. Compact and easy to install, they are ideal for fire service tanks, industrial water systems, and irrigation setups.
Key Features
Fixed ratio pressure reduction – no adjustment required
Tamper-proof design – ensures consistent performance
High-pressure capability – rated up to 35 bar (optional 50 bar)
Simple sealing action – one moving part for reliability
Corrosion-resistant construction – bronze body, stainless steel internals
Applications & Benefits
Applications
- Fire service water systems
- Industrial water supply
- Irrigation header tanks
- Agricultural water storage
Benefits
- Protects downstream equipment – prevents damage from excess pressure
- Reliable performance – tamper-proof and maintenance-friendly
- Long service life – corrosion-resistant materials for harsh environments
Technical Specifications
- Size Range: ½” to 2″ BSP
- Connection Type: BSP threaded ends
- Pressure Rating: 35 bar (500 psi); optional 50 bar (725 psi)
- Material: Bronze body, stainless steel seat and piston, nitrile O-rings and seals
Note: Always confirm size, pressure class, and compliance requirements against the official datasheet and local standards.
Installation Guide
- Apply PTFE tape or approved sealant to male BSP threads.
- Screw valve into female thread by hand until firm, then tighten using a spanner on the hex body.
- Ensure correct flow direction as indicated on the valve body.
- Pressurise and test the system for correct operation and leak-free performance.
For detailed diagrams and torque specifications, view the Philmac installation guide online.
FAQs
What is this valve used for?
It’s designed for pressure reduction in fixed head water systems such as fire services, industrial supply, and irrigation tanks.
What sizes are available?
½”, ¾”, 1″, 1¼”, 1½”, and 2″ BSP.
Do I need special tools for installation?
No. Standard spanners are sufficient.
What makes this valve different?
Its fixed ratio, tamper-proof design ensures reliable pressure control without adjustment, even under high-pressure conditions.
