API 6A Surface Safety Valve / Fail-Safe Gate Valve / Ssv for ...

1.The relief valve is an important component of wellhead production. When high pressure enters the drive, the bottom spring will open the valve. Through console operation, the spring on the relief valve will automatically push the stem to close the valve, thus ensuring safety on the production.assembled safety valve with consideration of optimal safety and economic. The available safety valve sizes from 1-13/16" through to 7-1/16",of pressure rating from 2000psi to 20000psi.

2.Hydraulic Surface Safety Valve feature:

A. Visual position indicator

B. Optional fire protection (fusible loop)

C. Separate stems can make them easy disassembling and maintaining.

D. Has a compoud-springs designing to improve its stability.

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Material Class

AA,BB,CC,DD,EE,FF,HH. 0.5, NL.

Valve Class

PSL1~PSL3G.

Valve Size

1 13/16"~7 1/16".

Valve Pressure

2000PSI~20000PSI.

Temp Range

K,L,N,P,S,T,U,V,X,Y.

Connecting Format

Flange

Working Temperature

High Temperature

Applicable Medium

Oil, Other

Type

Right-angle Type

Flow Direction

Bi-directional

Additional reading:
Surface Safety Valve - Senoil
Overmolding and Insert Molding Design Guide
Morse Tapers

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Application

Adjust

Driving Mode

Hydraulic Control

Sealing Form

Flexible Seal

Material

Stainless Steel

Body Structure

Unclosed

Mpa

High Pressure

 

The sizing of a safety valve is of utmost importance to ensure its ability to release steam from any source effectively, thus preventing the pressure within the protected equipment from exceeding the maximum allowable accumulated pressure (MAAP). To achieve this, proper positioning and correct valve setting are crucial. Additionally, the safety valve must be appropriately sized to allow the necessary amount of steam to pass at the required pressure, even during various potential fault scenarios.

Once the specific safety valve type, set pressure, and location within the system have been determined, it becomes necessary to calculate the required discharge capacity of the valve. This calculation enables us to ascertain the necessary orifice area and nominal size based on the specifications provided by the manufacturer.

To establish the maximum capacity needed, it is essential to consider the potential flow through all relevant branches upstream of the valve.

In cases where multiple flow paths are present, sizing the safety valve becomes more complex. Several alternative methods can be considered to determine its size in such situations. The following alternatives should be carefully evaluated:

1. Sizing the safety valve based on the maximum flow within the flow path that experiences the highest amount of flow.
2. Sizing the safety valve to accommodate the combined flow from all flow paths.

The choice between these two methods depends on the risk of multiple devices failing simultaneously. If there exists even the slightest possibility of such an occurrence, the valve must be sized to handle the combined flow from the failed devices. However, in cases where the risk is negligible, cost considerations may lead to sizing the valve based only on the highest fault flow. Ultimately, it falls under the responsibility of the company ensuring the plant to decide which method to employ.

To illustrate, let us consider the pressure vessel and automatic pump-trap (APT) system depicted in the following Figure. Although unlikely, there is a scenario where both the APT and pressure reducing valve (PRV ‘A’) could fail simultaneously. In this case, the discharge capacity of safety valve ‘A’ would either need to accommodate the fault load from the largest PRV or the combined fault load from both the APT and PRV ‘A’.

It is recommended, according to this document, that whenever multiple flow paths are present, the sizing of all relevant safety valves should always consider the possibility of simultaneous failures in the upstream pressure control valves.

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