Spirax Sarco - Catalogo Agosto 2017

4.6.17 Control valves

Pressure reducing/surplussing valves

Local regulations may restrict the use of this product to below the conditions quoted.

In the interests of development and improvement of the product, we reserve the right to change the specification without notice.

TI-P001-07

CH Issue 5

LRV2B and LRV2S

Gunmetal

Pressure Reducing Valves

Description

The LRV2B and LRV2S are direct acting pressure reducing valves

suitable for liquid applications.

ASTM A276 316L

BS 970 431 S29

BS 1449 316 S11

BS 970 431 S29

BS 2056 Gr. 302 S26

BS 1449 316 S16

BS 2872 CZ 122

Available types

LRV2B

Phosphor bronze/brass bellows

LRV2S

Stainless steel (316 Ti / 316L) bellows

No. Part

10 Push rod

11 Valve seat

12 Valve seat gasket

13 Piston

14 Valve head

15 Piston return spring

16 Strainer screen

17 Cap

18 Cap gasket

19 Spring range ID disc

20 Bulkhead plate

21 Tamper-proof pin

LRV2B and LRV2S pressure reducing valves are supplied with one

of three colour coded springs which are identified by the disc (19)

located on the adjustment handwheel:

Grey

For downstream pressure control: 0.35 to 1.7 bar g

Green

For downstream pressure control: 1.40 to 4.0 bar g

Orange

For downstream pressure control: 3.50 to 8.6 bar g

Note: where control spring ranges overlap always use the lower

range to give better control.

Sizes and pipe connections

1⁄2", 3⁄4" and 1" Screwed BSP (BS 21 Rp) or NPT.

Pressure/temperature limits

��

Body design conditions

PMA Maximum allowable pressure

TMA Maximum allowable temperature

Minimum allowable temperature

PMO Maximum operating pressure

TMO Maximum operating temperature

��

Pressure bar g

This product must not be used in this region.

PN25

25 bar g @ 120°C

100°C @ 17 bar g

0°C

14 bar g @ 75°C

75°C @ 14 bar g

0°C

Note: For lower operating temperatures consult Spirax Sarco

Minimum operating temperature

DPMX Maximum differential pressure is limited to the PMO

Maximum recommended turndown ratio 10:1 at maximum flow

Designed for a maximum cold hydraulic test pressure of 38 bar g

Note: With internals fitted, test pressure must not exceed 17 bar g

Materials

No. Part

1 Spring housing

2 Adjustment handwheel

3 Top spring plate

4 Pressure adjustment

spring

5 Bellows assembly

6 Bellows assembly gasket

7 Hex. bolt (M8 x 25 mm)

8 Body

9 Cone shaped washer

Materials

Aluminium epoxy coated

Polypropylene

LM 24

Materials

Stainless steel

Nitrile rubber

Stainless steel

Brass

Cast iron

Silicon chrome

spring steel

Stainless steel

Phosphor bronze

DIN 1691 GG 20

BS 2803 685 A55

Range 2

316Ti/316L

BS 2872 CZ 122

Stainless steel reinforced

exfoliated graphite

Stainless steel reinforced

exfoliated graphite

Polypropylene

Stainless steel

316L

Mild steel copper plated

Steel zinc plated

Gunmetal

Stainless steel

BS 3692 Gr. 8.8

BS 1400 LG2

ASTM A276 316L