LESER Change-over Valves
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Best Availability LESER Change-over Valves Type 330, Type 320

High operating to set pressure ratio, high backpressure or low total height? High Efficiency Clean Service application? Clean Service Critical Service Valve finder Your path to the right product group Critical Service / highly corrosive application? Steam, gas and liquid application with low capacity in relation to valve size? Modulate Action Spring loaded Safety Relief Valves High Performance Required Orifice letter? Best Availability Bursting disc High plant availability important? Changeover valves Compact Performanc

Contents Type 330, Type 320 Page LESER Type General information Valve finder LESER Change-over Valves Applications, industries, advantages Article numbers and technical data Metric units US units Basics Design and pressure loss coefficient Calculation pressure loss Type 330 Compact, Type 320 Flow Designs, materials LESER Type Type 330 Compact Article numbers and technical data Metric units US units Flange facings, Temperature limits Lockable combination Dimensions - Metric units - US units LESER worldwide

LESER Change-over Valves Applications Change-over valves are used in various industries in order to ■ ensure uninterrupted operation ■ minimise safety risks due to unplanned shutdown periods. These industries are ■ Petrochemical industry ■ Oil and gas industry ■ Technical gasses ■ Chemicals industry ■ Refrigeration Safety valve side Piping side Change-over valves are used to connect two safety valves with a pipe connection to a pressure system, in order to increase operational availability. One safety valve is in operation and one safety valve is on standby. The standby safety valve can be...

General information Type 330, Type 320 Two change-over valve types Design features Type 330 Compact offers the solution for low-pressure loss requirements Valve sizes DN 25 – DN 400 / NPS 1" – 16" Pressure ratings Type 330 Compact: PN 10 – PN 40 / CL150 – CL300 Type 320 Flow: PN 10 – PN 250 / CL150 – CL1500 Flange drillings in accordance with DIN EN 1092 and ASME B16.5 Body materials Type 330 / 320 Type 320 Flow has an optimal flow path for highest pressure loss requirements Low-temperature steel Stainless steel Other materials for special requirements available upon request. Options...

Basics Design and pressure loss coefficient Basics Pressure loss in the inlet line is considered to be the pressure difference between the pressure in the system to be safeguarded and the pressure in front of the safety valve during discharge. When a safety valve is activated, the flow losses in the inlet line cause a pressure loss. The pressure loss in the inlet line may not exceed 3% of the set pressure in accordance with applying international standards. If the 3% limit is exceeded, the safety valve may not show a stable function any longer (chatter). As a consequence, the full power may...

Basics Calculation of pressure loss To calculate the pressure loss in the inlet line to the safety valve entrance, the change-over valve as well as possible addition piping sections and installations must be considered. To do so, the inlet pipe system is divided into sections. A section is formed for each flow or reference diameter. In the following example, two sections can be formed. One for the change-over valve (∆pwv) and one for the connected piping (∆p1). Piping – all piping sections – separate pressure loss calculation for different flow diameters – reducers for connecting pipes of...

Designs Type 330, Type 320 Type 330 Compact The change-over valve Type 330 Compact is flow-optimized and at the same time compact for installation. It is the best solution if the requirements of the combined safety valves or the additional piping of the pressure loss are not unusually high. Due to its compact design, it is cost-efficient so that it represents the most economical solution for a safety valve/change-over valve combination. In lockable combinations, it can be selected as standard at the outlet since there are no increased requirements of the pressure loss via the change-over...

How to Order Type 330, Type 320 Composition of the article number 3300.0010 0: Global Configuration 001: Counting number (nominal size, pressure rating) 0: C onfigurable base material - Q09: Steel, body material 1.0619 / WCB - Q10: Low-temperature steel, body material LCB - Q11: Stainless steel, body material 1.4408 / CF8M 330: Type Order specification In order to clearly specify a change-over valve, the following information is required: Base construction Article number Operating temperature Operating pressure [barg / psig ...] Body materials Design regulations Other materials Connections...

Designs Type 330, Type 320

Materials Type 330, Type 320 Item Inlet body Elbows – Activation side Depending on pressure and size: Depending on pressure and size: Option Code Packing gland Position indicating device Hand wheel Graphite Graphite Graphite Graphite Graphite Graphite Type 320 DN 80/3" and DN 100 / 4" in PN 250/CL1500: – PED: 1.4980 / Gr. 660B – ASME: Gr. 660B – PED / ASME: 1.4980 / Gr. 660B 2) For some article numbers LESER reserves the right to use higher quality materials at higher temperatures. 3) Type 330 DN 200 to DN 300, Type 320 DN 125 to DN 200: – Studs: A4-70 / B8M – Nuts: A4-70 / 8M 1) Please...

Type 330 Compact Article numbers and technical data Metric units Safety valve side Pressure rating body basic construction Piping side Pressure loss coefficient (zeta) KVS (rt, water) Weight H dimension standard H dimension extended Weight H dimension extended Safety valve side Piping side Pressure loss coefficient (zeta) Weight H dimension standard Weight H dimension extended Expansion piping side Safety valve side Piping side Pressure loss coefficient (zeta) KVS (rt, water) Weight H dimension standard Weight H dimension extended The flange thickness and the outer diameter of the...