Bailey 707ML Safety Relief Valve Female x Female (Metal Disc with Lever – Suitable for Steam & Liquid Service)

The CONCOA 315 Series is a chrome-plated brass, dual-stage cylinder regulator designed for inert and non-corrosive gases in medical laboratory applications. Its two-stage design ensures stable outlet pressure or flow by compensating for gradual cylinder pressure drops. The regulator provides point-of-use control across five pressure ranges, from 0–15 PSIG (0–2 BAR) to 0–200 PSIG (0–14 BAR). It comes with a standard 2–15 lpm flowgauge calibrated for CO₂ (for lasers and cell growth chambers) or a custom thermal mass flowmeter-calibrated gauge for specific gases. While suitable for medical lab use, it is not intended for therapeutic use in humans.

Features:

• Field-adjustable pressure limit for application flexibility

• 316L stainless steel diaphragm prevents inboard diffusion

• CAPSULE® seat design with 360° integral filtration in both stages

• Helium leak-tested for integrity

Specifications:

• Max inlet pressure: 3000 PSIG (210 BAR)

• Body: Chrome-plated brass barstock; Bonnet: Chrome-plated die-cast zinc

• Gauges: 2" (50 mm) plated case

• Seats: PCTFE (first stage), PTFE (second stage)

• Filter: 10-micron sintered bronze

• Temperature range: -40°F to 140°F (-40°C to 60°C)

• Diaphragm: 316L stainless steel; Cv: 0.1

• Helium leak integrity: 1 × 10⁻⁸ scc/sec

• Internal seals: PTFE; Ports: 1/4" FNPT

• Compliance: Meets/exceeds CGA G-4.1, PED 2014/68/EU, ANSI/ASME B40.1, CRN OH5216

The Altecnic / Caleffi 309 Pressure & Temperature Relief Valve - 309570CST is designed to effectively regulate and limit the temperature and pressure of hot water in domestic storage heaters. By preventing the water from exceeding 100°C and the formation of steam, this valve ensures safety and efficiency. Once the set parameters are reached, the valve expels an adequate amount of water into the atmosphere, allowing the temperature and pressure to return to safe operating limits. The mechanism of the valve operates as follows: - **Temperature Control**: The thermostat compound within the temperature sensor, which is submerged in hot water, expands as the temperature rises. This expansion drives a thrust pin that acts on the obturator, thereby opening the valve. The valve is calibrated to open when the temperature exceeds 90°C. - **Pressure Control**: When the pressure reaches the predetermined setting, the obturator, which is countered by a set spring, lifts and fully opens the outlet. The pressure setting is selected based on the maximum allowable pressure within the system. As temperature and pressure decrease, the valve automatically re-closes within the specified tolerances.

**Specifications**

• Size: 3/4"
• Connections: Male x Ø 22 mm with compression fitting for copper pipe
• Materials: DZR
• Medium: Water
• Set Pressure: 7 Barg
• Discharge Rating: 25 kW
• Temperature Setting: 90°C
• Probe Length: 99mm
• Product Code: 309570CST
• Notes: WRAS approved, CE marked

This high-quality relief valve is an essential component for maintaining the safety and efficiency of your hot water system, making it a trusted choice for both installers and homeowners.

### Product Specifications **Sizes Available:** - 1/2" (DN15) - 3/4" (DN20) - 1" (DN25) - 1 1/2" (DN40) - 2" (DN50) **Connections:** - Flanged PN40 Inlet - Flanged PN40 Outlet **Materials:** - Body & Bonnet: Stainless Steel - Disc: FKM - Seals: FKM **Medium Compatibility:** This product is suitable for aggressive water and other aggressive liquids, as well as compressed air, nitrogen, and gases. Please note that it is not suitable for steam. **Pressure Ratings:** - Inlet Pressure (Max): 40 Barg - Outlet Pressure Range: 0.5 to 9 Barg **Flow Coefficient (Kvs) Range:** 2.9 to 13 **Temperature Limit:** Maximum operating temperature: 190°C **Certifications:** - Compliant with PED 97/23/CE category I **Additional Information:** For optimal sizing, please use our sizing calculator available in the TECHNICAL INFO section located in the menu bar above. --- Optimise your search for high-quality valves that meet stringent standards and can handle demanding conditions. Our durable stainless steel valves offer reliability and efficiency for various applications.