Leser LESER Type 526
LESER spring-loaded safety valve, Type 526 series, to API 526, for high pressures and temperatures.
LESER Type 526 is a spring-loaded safety valve, built to the API 526 standard, for high pressures and temperatures in petrochemicals, chemicals and the oil and gas industry. The type code indicates the inlet/outlet connection (DN or NPS) and the orifice letter, from D to T, which sets the flow area; the regional versions 526 CC and 526 IC keep the same pressure ranges, but use materials and gaskets adapted to harsher conditions.
For a quotation we need the set pressure in barg, back pressure, the medium handled, the operating temperature and the code from the valve nameplate or the desired DN/orifice connection. Delivery of a new valve usually takes 1–4 weeks, through supply from the European area; we do not carry out the sizing calculation, which remains the responsibility of the process engineer or the manufacturer.
Models and codes
| Code | Note |
|---|---|
| Type 526 | Standard API 526 version, orifice D–T |
| Type 526 CC | Version for the Chinese market, hardened discs |
| Type 526 IC | Version for cryogenic temperatures, high-alloy materials |
Key specifications
| Set pressure range (CE) | 0.12–400 bar |
|---|---|
| Set pressure range (ASME) | 0.12–414 bar |
| Temperature (CE) | -270…+550 °C |
| Connections to DIN EN 1092 | DN 25–DN 200 |
| Connections to ASME B16.5 | NPS 1–NPS 8 |
| Pressure ratings | PN16–PN400 / Class150–2500 |
| Orifice range | D–T |
| Minimum flow diameter d0 | 14–161.5 mm |
LESER keeps Type 526 active, alongside the regional versions 526 CC and 526 IC, with no mention of withdrawal from production.
Frequently asked questions
What information do we send for a quotation on a Type 526 valve?
The set pressure in barg, the permitted back pressure, the medium handled (liquid, gas or steam), the operating temperature and, if available, the complete code from the valve nameplate or the desired DN/orifice size. With these data we check the suitable version, standard, CC or IC, in the LESER documentation.
Who does the sizing calculation for the LESER series?
We do not carry out the valve sizing calculation for the customer's installation; this calculation remains the responsibility of the process engineer or is checked directly by LESER through their selection program. We do not promise delivery times shorter than those indicated by the manufacturer.
We do not carry out the valve sizing calculation; we recommend that it be checked by the process engineer or directly by the manufacturer.
Updated: 2026-11-12