PN16
Product Overview
The LRV2B and LRV2S are direct acting pressure reducing valves suitable for liquid applications. They feature a gunmetal body with screwed connections and are designed for reliable downstream pressure control.
Available types:
- LRV2B: Phosphor bronze/brass bellows
- LRV2S: Stainless steel (316Ti/316L) bellows
Spring Ranges (Color Coded)
The valve is supplied with one of three color coded springs, identified by the disc on the adjustment handwheel:
| Color | Downstream Pressure Range |
|---|---|
| Grey | 0.35 to 1.7 bar g (5.08 to 24.7 psi g) |
| Green | 1.40 to 4.0 bar g (20.3 to 58.0 psi g) |
| Orange | 3.50 to 8.6 bar g (50.8 to 125 psi g) |
Note: Where control spring ranges overlap, always use the lower range to give better control.
Sizes and Pipe Connections
- Sizes: ½", ¾", and 1"
- Connections: Screwed BSP (BS 21 Rp) or NPT
Pressure and Temperature Limits
| Parameter | Value |
|---|---|
| Body design conditions | PN25 |
| PMA - Maximum allowable pressure | 25 bar g @ 120 °C (363 psi g @ 248 °F) |
| TMA - Maximum allowable temperature | 100 °C @ 17 bar g (212 °F @ 247 psi g) |
| Minimum allowable temperature | 0 °C (32 °F) |
| PMO - Maximum operating pressure | 14 bar g @ 75 °C (203 psi g @ 167 °F) |
| TMO - Maximum operating temperature | 75 °C @ 14 bar g (167 °F @ 203 psi g) |
| Minimum operating temperature | 0 °C (32 °F) |
| PMX - Maximum differential pressure | Limited to PMO |
| Maximum recommended turndown ratio | 10:1 at maximum flow |
| Maximum cold hydraulic test pressure | 38 bar g (551 psi g) |
WARNING
With internals fitted, test pressure must not exceed 17 bar g (247 psi g).
Materials
| No. | Part | Material |
|---|---|---|
| 1 | Spring housing | Aluminium epoxy coated LM 24 |
| 2 | Adjustment handwheel | Polypropylene |
| 3 | Top spring plate | Cast iron DIN 1691 GG 20 |
| 4 | Pressure adjustment spring | Silicon chrome spring steel BS 2803 685 A55 |
| 5 | Bellows assembly | Stainless steel 316Ti/316L or Phosphor bronze BS 2872 CZ 122 |
| 6 | Bellows assembly gasket | Stainless steel reinforced exfoliated graphite |
| 7 | Hex. bolt (M8 x 25 mm) | Steel zinc plated BS 3692 Gr. 8.8 |
| 8 | Body | Gunmetal BS 1400 LG2 |
| 9 | Cone shaped washer | Stainless steel ASTM A276 316L |
| 10 | Push rod | Stainless steel ASTM A276 316L |
| 11 | Valve seat | Stainless steel BS 970 431 S29 |
| 12 | Valve seat gasket | Stainless steel BS 1449 316 S11 |
| 13 | Piston | Stainless steel BS 970 431 S29 |
| 14 | Valve head | Nitrile rubber |
| 15 | Piston return spring | Stainless steel BS 2056 Gr. 302 S26 |
| 16 | Strainer screen | Stainless steel BS 1449 316 S16 |
| 17 | Cap | Brass BS 2872 CZ 122 |
| 18 | Cap gasket | Stainless steel reinforced exfoliated graphite |
| 19 | Spring range ID disc | Polypropylene |
| 20 | Bulkhead plate | Stainless steel 316L |
| 21 | Tamper-proof pin | Mild steel copper plated |
Capacities
Full lift capacity for safety valve sizing purposes:
| Size | Kvs |
|---|---|
| ½" | 2.1 |
| ¾" | 3.6 |
| 1" | 4.3 |
Conversion factors:
- Cv (UK) = Kv × 0.963
- Cv (US) = Kv × 1.156
Dimensions and Weights
Dimensions in mm and kg:
| Size | A | B | C | D | E | F | Weight |
|---|---|---|---|---|---|---|---|
| ½" | 83 | 32 | 62 | 130 | 25 | 40 | 2.0 |
| ¾" | 96 | 32 | 62 | 130 | 25 | 40 | 2.1 |
| 1" | 108 | 32 | 62 | 130 | 25 | 40 | 2.4 |
(Dimensions in mm, weight in kg. E and F are withdrawal distances)
Installation
Safety Note
The product must not be used in the shaded region of the pressure/temperature chart.
Installation requirements:
- Install in a horizontal pipeline with flow direction as indicated by the arrow on the valve body
- Isolation valves (upstream and downstream) should be installed with a clear run of 8-10 diameters on either side
- Line stresses caused by expansion or inadequate pipe support must not be imposed on the valve body
- Piping on both inlet and outlet must be of ample size to avoid undue pressure drop
- A strainer in the upstream supply provides additional protection
- A pressure gauge is essential in the downstream pipework for setting the operating pressure
Adjustment:
- Turn adjustment knob clockwise to increase pressure
- Turn anti-clockwise to reduce pressure
- Before changing pressure, ensure the Tamper-proof pin has not been fitted
Maintenance
The valve and seat must be kept clean. Any strainer fitted upstream of the LRV2, and the inbuilt strainer screen, should be cleaned regularly to ensure flow is not restricted.
Setting Pressure
- Slacken off the adjustment by turning the knob fully anti-clockwise
- Open the isolating valves
- Set pressure with normal running load passing through the valve
- Turn adjustment knob clockwise until required pressure is obtained
Under reduced flow conditions, the downstream pressure will rise but will control slightly higher than the set pressure.
Spare Parts
Available spares:
| Spare | Parts Included | Description |
|---|---|---|
| Pressure adjustment spring (Grey) | 4, 19 | 0.35 to 1.7 bar g |
| Pressure adjustment spring (Green) | 4, 19 | 1.40 to 4.0 bar g |
| Pressure adjustment spring (Orange) | 4, 19 | 3.50 to 8.6 bar g |
| Bellows assembly | 5, 6, 9 | Stainless steel or phosphor bronze |
| Spring housing hex. bolts | 7 | Set of 4 |
| Valve and seat assembly | 6, 11, 12, 13, 14, 15, 16, 20 | |
| Gasket set | 6, 12, 18 | |
| Strainer screen | 16 |
Recommended Tightening Torques
| Item | Part | Size | Torque |
|---|---|---|---|
| 7 | Hex. bolts | 13 A/F, M8 x 25 | 13-15 N·m (10-11 ft·lbf) |
| 11 | Valve seat | 32 A/F | 108-132 N·m (80-97 ft·lbf) |
| 16 | Bottom cap | 32 A/F | 65-75 N·m (48-55 ft·lbf) |
How to Order
Example: 1 off Spirax Sarco ½" LRV2S pressure reducing valve with gunmetal body, screwed BSP connections, stainless steel bellows and fitted with an orange spring for downstream pressure control of 3.5 to 8.6 bar g (50.8 to 125 psi g).
Certification
The only certification available for this product is a manufacturer's Typical Test Report. All certification/inspection requirements must be stated at the time of order placement.
